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Transmission tower
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<h2 id="terminology">Terminology</h2> <p><i>Transmission tower</i> is the name for the structure used in the industry in the United States and some other English-speaking countries.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> In Europe and the U.K., the terms <i>electricity pylon</i> and <i>pylon</i> derive from the basic shape of the structure, an obelisk with a tapered top.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> In Canada, the term <i>hydrotower</i> is used, because <a href="/facts/Hydroelectricity/zEeJIK2B">hydroelectricity</a> is the principal source of electricity for the country.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a><a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> </p> <h2 id="high-voltage-ac-transmission-towers">High voltage AC transmission towers</h2> <p><a href="/facts/Three-phase_electric_power/YXY3bQCx">Three-phase electric power</a> systems are used for high voltage (66- or 69-kV and above) and extra-high voltage (110- or 115-kV and above; most often 138- or 230-kV and above in contemporary systems) <a href="/facts/Alternating_current/qxICS3xa">AC</a> transmission lines. In some European countries, e.g. Germany, Spain or Czech Republic, smaller lattice towers are used for medium voltage (above 10 kV) transmission lines too. The towers must be designed to carry three (or multiples of three) conductors. The towers are usually steel lattices or <a href="/facts/Truss/bJXJyUtz">trusses</a> (wooden structures are used in Australia, Canada, Germany, and <a href="/facts/Scandinavia/KpLQ40kl">Scandinavia</a> in some cases) and the insulators are either glass or porcelain discs or composite insulators using silicone rubber or <a href="/facts/EPDM_rubber/U03Nlm0L">EPDM rubber</a> material assembled in strings or long rods whose lengths are dependent on the line voltage and environmental conditions. </p><p>Typically, one or two <a href="/facts/Ground_wire_(transmission_line)/jULhrQNv">ground wires</a>, also called "guard" wires, are placed on top to intercept lightning and harmlessly divert it to ground. </p><p>Towers for high- and extra-high voltage are usually designed to carry two or more electric circuits.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> If a line is constructed using towers designed to carry several circuits, it is not necessary to install all the circuits at the time of construction. Indeed, for economic reasons, some transmission lines are designed for three (or four) circuits, but only two (or three) circuits are initially installed. </p><p>Some high voltage circuits are often erected on the same tower as 110 kV lines. Paralleling circuits of 380 kV, 220 kV and 110 kV-lines on the same towers is common. Sometimes, especially with 110 kV circuits, a parallel circuit carries <a href="/facts/Traction_power_network/6rpqWn2r">traction lines</a> for <a href="/facts/Railway_electrification/WksMTQ4u">railway electrification</a>. </p> <h2 id="high-voltage-dc-transmission-towers">High voltage DC transmission towers</h2> <p><a href="/facts/High-voltage_direct_current/FDIob86A">High-voltage direct current</a> (HVDC) transmission lines are either <a href="/facts/High-voltage_direct_current/FDIob86A">monopolar</a> or <a href="/facts/High-voltage_direct_current/FDIob86A">bipolar</a> systems. With bipolar systems, a conductor arrangement with one conductor on each side of the tower is used. On some schemes, the ground conductor is used as <a href="/facts/Electrode_line/Bvcj5Qud">electrode line</a> or ground return. In this case, it had to be installed with insulators equipped with surge arrestors on the pylons in order to prevent <a href="/facts/Corrosion/lIC7H4we">electrochemical corrosion</a> of the pylons. For single-pole HVDC transmission with ground return, towers with only one conductor can be used. In many cases, however, the towers are designed for later conversion to a two-pole system. In these cases, often conductors on both sides of the tower are installed for mechanical reasons. Until the second pole is needed, it is either used as electrode line or joined in parallel with the pole in use. In the latter case, the line from the converter station to the earthing (grounding) <a href="/facts/Electrode/251PaKX8">electrode</a> is built as underground cable, as overhead line on a separate right of way or by using the ground conductors. </p><p>Electrode line towers are used in some HVDC schemes to carry the power line from the converter station to the grounding electrode. They are similar to structures used for lines with voltages of 10–30 kV, but normally carry only one or two conductors. </p><p>AC transmission towers may be converted to full or mixed HVDC use, to increase power transmission levels at a lower cost than building a new transmission line.<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a><a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> </p> <h2 id="railway-traction-line-towers">Railway traction line towers</h2> <p class="note">Further information: <a href="/facts/Traction_current_pylon/JHgXE6ds">Traction current pylon</a></p> <p>Towers used for <a href="/facts/Single-phase_generator/2ejWN9Uw">single-phase AC</a> <a href="/facts/Railway/9nJQbsDV">railway</a> <a href="/facts/Overhead_lines/bfrXA9Em">traction lines</a> are similar in construction to those towers used for 110 kV three-phase lines. Steel tube or concrete poles are also often used for these lines. However, railway traction current systems are two-pole AC systems, so traction lines are designed for two conductors (or multiples of two, usually four, eight, or twelve). These are usually arranged on one level, whereby each circuit occupies one half of the cross arm. For four traction circuits, the arrangement of the conductors is in two levels and for six electric circuits, the arrangement of the conductors is in three levels. </p> <h2 id="tower-designs">Tower designs</h2> <p>Transmission towers must withstand various external forces, including wind, ice, and seismic activity, while supporting the weight of heavy conductors. </p> <h3>Shape</h3> <p>Different shapes of transmission towers are typical for different countries. The shape also depends on voltage and number of circuits. </p> <h4>One circuit</h4> <p>Delta pylons are the most common design for single circuit lines, because of their stability. They have a V-shaped body with a horizontal arm on the top, which forms an inverted <a href="/facts/Delta_(letter)/otPsSYj6">delta</a>. Larger Delta towers usually use two guard cables. </p><p>Portal pylons are widely used in the USA, Ireland, Scandinavia and Canada. They stand on two legs with one cross arm, which gives them a H-shape. Up to 110 kV they often were made from wood, but higher voltage lines use steel pylons. </p><p>Smaller single circuit pylons may have two small cross arms on one side and one on the other. </p> <h4>Two circuits</h4> <p>One level pylons only have one cross arm carrying 3 cables on each side. Sometimes they have an additional cross arm for the protection cables. They are frequently used close to airports due to their reduced height. </p><p>Danube pylons or <i>Donaumasten</i> got their name from a line built in 1927 next to the <a href="/facts/Danube_river/8lMeM9xg">Danube river</a>. They are the most common design in central European countries like Germany or Poland. They have two cross arms, the upper arm carries one and the lower arm carries two cables on each side. Sometimes they have an additional cross arm for the protection cables. </p><p>Ton shaped towers are the most common design, they have 3 horizontal levels with one cable very close to the pylon on each side. In the United Kingdom the second level is often (but not always) wider than the other ones while in the United States all cross arms have the same width. </p> <h5>T-pylons</h5> <p>In 2021 the first T-pylon, a new tubular T-shaped design, was installed in United Kingdom for a new power line to <a href="/facts/Hinkley_Point_C_nuclear_power_station/VcaLwKMz">Hinkley Point C nuclear power station</a>, carrying two high voltage 400 kV power lines.<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a><a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a> The design features electricity cables strung below a cross-arm atop a single pole which reduces the visual impact on the environment compared to lattice pylons. These 36 T-pylons were the first major UK redesign since 1927, designed by Danish company <a href="/facts/Bystrup_Architecture_Design_Engineering/3d41E8wz">Bystrup</a>, winner of a 2011 competition from more than 250 entries held by the <a href="/facts/Royal_Institute_of_British_Architects/grdupR5D">Royal Institute of British Architects</a> and <a href="/facts/Government_of_the_United_Kingdom/3zLlUWbx">Her Majesty's Government</a>.<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a> </p> <h5>Y-pylons</h5> <p>Y-pylons are a newer concept for electrical transmission towers. They usually have a <a href="/facts/Guy-wire/N1R4TnKQ">guy-wire</a> or support beam to help support the "Y" shape in the tower.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a><a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a> </p> <h4>Four circuits</h4> <p>Christmas-tree-shaped towers for 4 or even 6 circuits are common in Germany and have 3 cross arms where the highest arm has each one cable, the second has two cables and the third has three cables on each side. The cables on the third arm usually carry circuits for lower high voltage. </p> <h4>Branch pylons</h4> <p>Special designed pylons are necessary to introduce branching lines, e.g. to connect nearby substations. </p> <h3>Support structures</h3> <p>Towers may be self-supporting and capable of resisting all forces due to conductor loads, unbalanced conductors, wind and ice in any direction. Such towers often have approximately square bases and usually four points of contact with the ground. </p><p>A semi-flexible tower is designed so that it can use overhead grounding wires to transfer mechanical load to adjacent structures, if a phase conductor breaks and the structure is subject to unbalanced loads. This type is useful at extra-high voltages, where phase conductors are bundled (two or more wires per phase). It is unlikely for all of them to break at once, barring a catastrophic crash or storm. </p><p>A <a href="/facts/Guyed_mast/Y2m1Aquz">guyed mast</a> has a very small footprint and relies on guy wires in tension to support the structure and any unbalanced tension load from the conductors. A guyed tower can be made in a V shape, which saves weight and cost.<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a> </p> <h3>Materials</h3> <h4>Tubular steel</h4> <p>Poles made of tubular <a href="/facts/Steel/aN6qWo4H">steel</a> generally are assembled at the factory and placed on the right-of-way afterward. Because of its durability and ease of manufacturing and installation, many utilities in recent years prefer the use of monopolar steel or concrete towers over lattice steel for new power lines and tower replacements. </p><p><a href="/facts/Energy_in_Germany/odPWVD3b">In Germany</a> steel tube pylons are also established predominantly for medium voltage lines, in addition, for high voltage transmission lines or two electric circuits for operating voltages by up to 110 kV. Steel tube pylons are also frequently used for 380 kV lines <a href="/facts/Energy_in_France/YetgwT5J">in France</a>, and for 500 kV lines <a href="/facts/Energy_in_the_United_States/E5qbVGlK">in the United States</a>. </p> <h4>Lattice</h4> <p class="note">See also: <a href="/facts/Lattice_tower/XSnl9Uw3">Lattice tower</a></p> <p>A lattice tower is a framework construction made of steel or aluminium sections. Lattice towers are used for <a href="/facts/Overhead_power_line/jULhrQNv">power lines</a> of all voltages, and are the most common type for high-voltage transmission lines. Lattice towers are usually made of galvanized steel. Aluminium is used for reduced weight, such as in mountainous areas where structures are placed by helicopter. Aluminium is also used in environments that would be corrosive to steel. The extra material cost of aluminium towers will be offset by lower installation cost. Design of aluminium lattice towers is similar to that for steel, but must take into account aluminium's lower <a href="/facts/Young%27s_modulus/MV5JMCIM">Young's modulus</a>. </p><p>A lattice tower is usually assembled at the location where it is to be erected. This makes very tall towers possible, up to 100 m (328 ft) (and in special cases even higher, as in the <a href="/facts/Elbe_crossing_1/KFB9PzcL">Elbe crossing 1</a> and <a href="/facts/Elbe_crossing_2/KFB9PzcL">Elbe crossing 2</a>). Assembly of lattice steel towers can be done using a <a href="/facts/Crane_(machine)/Q5axXY0l">crane</a>. Lattice steel towers are generally made of angle-profiled steel beams (L-beam or <a href="/facts/T-beam/KczkDSfL">T-beams</a>). For very tall towers, <a href="/facts/Truss/bJXJyUtz">trusses</a> are often used. </p> <h4>Wood</h4> <p><a href="/facts/Wood/z13NpHPl">Wood</a> is limited in use in high-voltage transmission. Because of the limited height of available trees, the maximum height of wooden pylons is limited to approximately 30 m (98 ft). Wood is rarely used for lattice framework. Instead, they are used to build multi-pole structures, such as H-frame and K-frame structures. The voltages they carry are also limited, such as in other regions, where wood structures only carry voltages up to approximately 30 kV. </p><p>In countries such as Canada or the United States, wooden towers carry voltages up to 345 kV; these can be less costly than steel structures and take advantage of the surge voltage insulating properties of wood.<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a> As of 2012<a href="https://en.wikipedia.org/w/index.php?title=Transmission_tower&action=edit">[update]</a>, 345 kV lines on wood towers are still in use in the US and some are still being constructed on this technology.<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a><a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a> Wood can also be used for temporary structures while constructing a permanent replacement. </p> <h4>Concrete</h4> <p><a href="/facts/Concrete/K6whGVNx">Concrete</a> pylons are used in <a href="/facts/Germany/paluuWBX">Germany</a> normally only for lines with operating <a href="/facts/Voltage/EN2po6N2">voltages</a> below 30 kV. In exceptional cases, concrete pylons are used also for 110 kV lines, as well as for the public grid or for the <a href="/facts/Railway/9nJQbsDV">railway</a> traction current grid. Concrete poles for medium-voltage are also used in Canada and the United States. </p><p>In Switzerland, concrete pylons with heights of up to 59.5 metres (world's tallest pylon of prefabricated concrete at <a href="/facts/Littau/slSIyc1N">Littau</a>) are used for 380 kV overhead lines. In <a href="/facts/Argentina/aFSA5bAk">Argentina</a> and some other South American countries, many overhead power lines, except the <a href="/facts/Ultra-high_voltage/jULhrQNv">ultra-high voltage</a> grid, were placed on tubular concrete pylons. Also in former <a href="/facts/Soviet/m7wWsPto">soviet</a> countries, concrete pylons are common, though with crossarms made of steel.<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a> </p><p>Concrete pylons, which are not prefabricated, are also used for constructions taller than 60 metres. One example is a 61.3 m (201 ft) tall pylon of a 380 kV powerline near Reuter West Power Plant in Berlin. In China some pylons for lines crossing rivers were built of concrete. The tallest of these pylons belong to the Yangtze Powerline crossing at Nanjing with a height of 257 m (843 ft). </p> <h3>Special designs</h3> <p>Sometimes (in particular on steel lattice towers for the highest voltage levels) transmitting plants are installed, and antennas mounted on the top above or below the overhead <a href="/facts/Ground_wire_(transmission_line)/jULhrQNv">ground wire</a>. Usually these installations are for mobile phone services or the operating radio of the power supply firm, but occasionally also for other radio services, like directional radio. Thus transmitting antennas for low-power FM radio and television transmitters were already installed on pylons. On the <a href="/facts/Elbe_Crossing_1/KFB9PzcL">Elbe Crossing 1</a> tower, there is a radar facility belonging to the <a href="/facts/Hamburg/kmAAsYtT">Hamburg</a> water and navigation office. </p><p>For crossing broad valleys, a large distance between the conductors must be maintained to avoid short-circuits caused by conductor cables colliding during storms. To achieve this, sometimes a separate mast or tower is used for each conductor. For crossing wide rivers and straits with flat coastlines, very tall towers must be built due to the necessity of a large height clearance for navigation. Such towers and the conductors they carry must be equipped with flight safety lamps and reflectors. </p><p>Two well-known wide river crossings are the <a href="/facts/Elbe_Crossing_1/KFB9PzcL">Elbe Crossing 1</a> and <a href="/facts/Elbe_Crossing_2/KFB9PzcL">Elbe Crossing 2</a>. The latter has the tallest overhead line masts in Europe, at 227 m (745 ft) tall. In Spain, the <a href="/facts/Overhead_line_crossing/z0wlMw4I">overhead line crossing</a> pylons in the Spanish <a href="/facts/Pylons_of_Cadiz/5LM3MW4d">bay of Cádiz</a> have a particularly interesting construction. The main crossing towers are 158 m (518 ft) tall with one <a href="/facts/Crossarm_(utility_pole)/wRPdk0VI">crossarm</a> atop a <a href="/facts/Frustum/TEfLWynX">frustum</a> framework construction. The longest overhead line spans are the crossing of the Norwegian <a href="/facts/Sognefjord_Span/WW1pWyXQ">Sognefjord Span</a> (4,597 m (15,082 ft) between two masts) and the <a href="/facts/Ameralik_Span/sMHvfaD8">Ameralik Span</a> in Greenland (5,376 m (17,638 ft)). In Germany, the overhead line of the EnBW AG crossing of the Eyachtal has the longest span in the country at 1,444 m (4,738 ft). </p><p>In order to drop overhead lines into steep, deep valleys, inclined towers are occasionally used. These are utilized at the <a href="/facts/Hoover_Dam/WIPXAeBe">Hoover Dam</a>, located in the United States, to descend the cliff walls of the <a href="/facts/Black_Canyon_of_the_Colorado/btWBlwpe">Black Canyon of the Colorado</a>. In Switzerland, a pylon inclined around 20 degrees to the vertical is located near <a href="/facts/Sargans/UJcEWYW0">Sargans</a>, <a href="/facts/St._Gallen_(canton)/at6lCxgy">St. Gallens</a>. Highly sloping masts are used on two 380 kV pylons in Switzerland, the top 32 meters of one of them being bent by 18 degrees to the vertical. </p><p>Power station chimneys are sometimes equipped with crossbars for fixing conductors of the outgoing lines. Because of possible problems with corrosion by flue gases, such constructions are very rare. </p><p>However, there are also roof-mounted support structures for high-voltage. Some thermal power plants in Poland like <a href="/facts/Po%C5%82aniec_Power_Station/SwN4k490">Połaniec Power Station</a> and in the former Soviet Union like <a href="/facts/Lukoml_Power_Station/dpL5BU3v">Lukoml Power Station</a> use portal pylons on the roof of the power station building for the high voltage line from the machine transformer to the switchyard. Also other industrial buildings may have a rooftop powerline support structure. </p><p>Beside this, it is also possible that the lower parts of an electricity pylon stand in a building. Such a structure a person, who cannot have a view of the interior of the building, cannot distinguish from a real rooftop pylon. A structure of this type is Tower 9108 of a 110 kV high-voltage traction power line in Fulda.<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a><a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> </p><p>An other unconventional way of installing powerlines are catenaries spun across a valley. Two such structures are used at the Kemano-Kitimat Powerline, another one can be found near Cape Town at 34.149954 S 18.926239 E. </p><p>A new type of pylon, called Wintrack pylons, as set to be used in the Netherlands starting in 2010. The pylons were designed as a minimalist structure by Dutch architects Zwarts and Jansma. The use of physical laws for the design made a reduction of the magnetic field possible. Also, the visual impact on the surrounding landscape is reduced.<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> </p><p>Two clown-shaped pylons appear in Hungary, on both sides of the <a href="/facts/M5_motorway_(Hungary)/5vapTfoq">M5 motorway</a>, near <a href="/facts/%C3%9Ajharty%C3%A1n/1Kj8t1S2">Újhartyán</a>.<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> </p><p>The <a href="/facts/Pro_Football_Hall_of_Fame/RsETBMlT">Pro Football Hall of Fame</a> in Canton, Ohio, U.S., and <a href="/facts/American_Electric_Power/BKerkov8">American Electric Power</a> paired to conceive, design, and install <a href="/facts/Goal_(sport)/h71oWHtC">goal post</a>-shaped towers located on both sides of <a href="/facts/Interstate_77_in_Ohio/8DX0Kb4W">Interstate 77</a> near the hall as part of a power infrastructure upgrade.<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> </p><p>The <a href="/facts/Mickey_pylon/8Dy7fvAT">Mickey pylon</a> is a <a href="/facts/Mickey_Mouse/XHA50EJP">Mickey Mouse</a> shaped transmission tower on the side of <a href="/facts/Interstate_4/1WSs2MDz">Interstate 4</a>, near <a href="/facts/Walt_Disney_World/fqeJkejj">Walt Disney World</a> in <a href="/facts/Orlando,_FL/QeW5fkCp">Orlando, FL</a>. <a href="/facts/Bog_Fox/gK7VV47u">Bog Fox</a> is a design pylon in Estonia south of <a href="/facts/Risti,_Estonia/erHKjjpy">Risti</a> at 58° 59′ 33.44″ N, 24° 3′ 33.19″ E. </p> <h2 id="assembly">Assembly</h2> <p>Before transmission towers are even erected, prototype towers are tested at <a href="/facts/Tower_testing_station/Qror771G">tower testing stations</a>. There are a variety of ways they can then be assembled and erected: </p> <ul><li>They can be assembled horizontally on the ground and erected by push-pull cable. This method is rarely used because of the large assembly area needed.</li> <li>They can be assembled vertically (in their final upright position). Very tall towers, such as the <a href="/facts/Yangtze_River_Crossing/3v32PpeW">Yangtze River Crossing</a>, were assembled in this way.</li> <li>A <a href="/facts/Jin-pole/J1Jof8hG">jin-pole</a> crane can be used to assemble lattice towers.<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> This is also used for <a href="/facts/Utility_pole/wRPdk0VI">utility poles</a>.</li> <li><a href="/facts/Helicopter/chQF7H55">Helicopters</a> can serve as <a href="/facts/Aerial_crane/8AxKrzb1">aerial cranes</a> for their assembly in areas with limited accessibility. Towers can also be assembled elsewhere and flown to their place on the transmission right-of-way.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a> Helicopters may also be used for transporting disassembled towers for scrapping.<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a></li></ul> <h2 id="markers">Markers</h2> <p>The <a href="/facts/International_Civil_Aviation_Organization/TzrL1mLr">International Civil Aviation Organization</a> issues recommendations on markers for towers and the <a href="/facts/Overhead_power_line/jULhrQNv">conductors</a> suspended between them. Certain jurisdictions will make these recommendations mandatory, for example that certain power lines must have <a href="/facts/Overhead_wire_marker/nYjexGXa">overhead wire markers</a> placed at intervals, and that <a href="/facts/Aircraft_warning_lights/TaMTAbKX">warning lights</a> be placed on any sufficiently high towers,<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a> this is particularly true of transmission towers which are in close vicinity to <a href="/facts/Airport/KQkDpK1n">airports</a>. </p><p>Electricity pylons often have an identification tag marked with the name of the line (either the terminal points of the line or the internal designation of the power company) and the tower number. This makes identifying the location of a fault to the power company that owns the tower easier. </p><p>Transmission towers, much like other steel lattice towers including broadcasting or cellphone towers, are marked with signs which discourage public access due to the danger of the high voltage. Often this is accomplished with a sign warning of the high voltage. At other times, the entire access point to the transmission corridor is marked with a sign. Sign warning of the high voltage may also state the name of the company who built the structures, and acquired and designated lands where the transmission structures stand and line segments or right of way. </p> <h2 id="tower-functions">Tower functions</h2> <p>Tower structures can be classified by the way in which they support the line conductors.<a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a> Suspension structures support the conductor vertically using suspension insulators. Strain structures resist net tension in the conductors and the conductors attach to the structure through strain insulators. Dead-end structures support the full weight of the conductor and also all the tension in it, and also use strain insulators. </p><p>Structures are classified as tangent suspension, angle suspension, tangent strain, angle strain, tangent dead-end and angle dead-end.<a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a> Where the conductors are in a straight line, a tangent tower is used. Angle towers are used where a line must change direction. </p> <h3>Cross arms and conductor arrangement</h3> <p>Generally three conductors are required per AC 3-phase circuit, although single-phase and DC circuits are also carried on towers. Conductors may be arranged in one plane, or by use of several cross-arms may be arranged in a roughly symmetrical, triangulated pattern to balance the impedances of all three phases. If more than one circuit is required to be carried and the width of the line right-of-way does not permit multiple towers to be used, two or three circuits can be carried on the same tower using several levels of cross-arms. Often multiple circuits are the same voltage, but mixed voltages can be found on some structures. </p> <h2 id="other-features">Other features</h2> <h3>Insulators</h3> <p><a href="/facts/Insulator_(electricity)/SfSXkrh5">Insulators</a> electrically isolate the live side of the transmission cables from the tower structure and earth. They are either glass or porcelain discs or composite insulators using silicone rubber or <a href="/facts/EPDM_rubber/U03Nlm0L">EPDM rubber</a> material. They are assembled in strings or long rods whose lengths are dependent on the line voltage and environmental conditions. By using disks the shortest surface electrical path between the ends is maximised which reduces the chance of a leakage in moist conditions. </p> <h3>Stockbridge dampers</h3> <p><a href="/facts/Stockbridge_damper/JlTPST82">Stockbridge dampers</a> are added to the transmission lines a meter or two from the tower. They consist of a short length of cable clamped in place parallel to the line itself and weighted at each end. The size and dimensions are carefully designed to damp any buildup of mechanical oscillation of the lines that could be induced by mechanical vibrations most likely caused by wind. Without them it is possible for a standing wave to become established that grows in magnitude and destroys the line or the tower. </p> <h3>Arcing horns</h3> <p><a href="/facts/Arcing_horns/QlTs6T6b">Arcing horns</a> are sometimes added to the ends of the insulators in areas where voltage surges may occur. These may be caused by either lightning strikes or in switching operations. They protect power line insulators from damage due to arcing. They can be seen as rounded metal pipework at either end of the insulator and provide a path to earth in extreme circumstances without damaging the insulator. </p> <h3>Physical security</h3> <p>Towersill have a level of physical security to prevent members of the public or climbing animals from ascending them. This may take the form of a security fence or climbing baffles added to the supporting legs. Some countries require that lattice steel towers be equipped with a <a href="/facts/Barbed_wire/uFVWD4zP">barbed wire</a> barrier approximately 3 m (9.8 ft) above ground in order to deter unauthorized climbing. Such barriers can often be found on towers close to roads or other areas with easy public access, even where there is not a legal requirement. In the United Kingdom, all such towers are fitted with barbed wire. </p> <h3>Other features</h3> <p>Some electricity pylons, especially for voltages above 100 kV, carry transmission antennas. In most cases these are cellphone antennas and antennas for radio relay links adjoined with them, but it is also possible that antennas of radio relay systems of power companies or antenna for small broadcasting transmitters in the VHF-/UHF-range are installed. The northern tower of <a href="/facts/Elbekreuzung_1/KFB9PzcL">Elbekreuzung 1</a> carries at a height of 30 metres a radar station for monitoring ship traffic on the Elbe river on its structure. The <a href="/facts/H%C3%BCrth/N9xI6Qo7">Tower 93 of Facility 4101</a>, a strainer at Hürth south of Cologne, Germany carried from 1977 to 2010 a public observation deck, which was accessible by a staircase. </p> <h2 id="notable-electricity-transmission-towers">Notable electricity transmission towers</h2> <p>The following electricity transmission towers are notable due to their enormous height, unusual design, unusual construction site or their use in artworks. Bold type denotes structure which was at one time the tallest transmission tower(s) in the world. </p> <table><tbody><tr><th>Tower</th><th>Year</th><th>Country</th><th>Town</th><th>Pinnacle</th><th>Remarks</th></tr><tr><td>Jintang-Cezi Overhead Powerline Link</td><td>2018–2019</td><td>China</td><td>Jintang Island</td><td>380 m</td><td>2656 metres long span between Jintang and Cezi island</td></tr><tr><td><a href="/facts/Zhoushan_Island_Overhead_Powerline_Tie/eXJMm3EL">Zhoushan Island Overhead Powerline Tie</a></td><td>2009–2010</td><td>China</td><td>Damao Island</td><td>370 m</td><td><a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a> Built by <a href="https://g.esgcc.com.cn/">State Grid</a><a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a></td></tr><tr><td><a href="/facts/Yangtze_River_power_line_crossings/3v32PpeW">Jiangyin Yangtze River Crossing</a></td><td>2003</td><td>China</td><td>Jiangyin</td><td>346.5 m</td><td></td></tr><tr><td>Amazonas Crossing of <a href="/facts/Tucuru%C3%AD_transmission_line/PDr11sqd">Tucuruí transmission line</a></td><td>2013</td><td>Brazil</td><td>near <a href="/facts/Almeirim,_Par%C3%A1/UKGL01zX">Almeirim</a></td><td>295 m<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a></td><td>Tallest electricity pylons in South America</td></tr><tr><td>Yangtze River power line crossing of Shanghai-Huainan Powerline</td><td>2013</td><td>China</td><td>Gaogouzhen</td><td>269.75 m</td><td></td></tr><tr><td><a href="/facts/Yangtze_River_power_line_crossings/3v32PpeW">Nanjing Yangtze River Crossing</a></td><td>1992</td><td>China</td><td>Nanjing</td><td>257 m</td><td>Tallest reinforced concrete pylons in the world</td></tr><tr><td>Pylons of Pearl River Crossing</td><td>1987</td><td>China</td><td>Pearl River</td><td>253 m + 240 m</td><td></td></tr><tr><td><a href="/facts/Orinoco_River_Crossing/2etPxGRT">Orinoco River Crossing</a></td><td>1990</td><td><a href="/facts/Venezuela/eX1qnkln">Venezuela</a></td><td>Caroní</td><td>240 m</td><td></td></tr><tr><td>Hooghly River Crossing</td><td></td><td><a href="/facts/India/1kKHcnxM">India</a></td><td><a href="/facts/Diamond_Harbour/MRrxxAD4">Diamond Harbour</a></td><td>236 m</td><td><a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a></td></tr><tr><td><a href="/facts/Pylons_of_Messina/6eBSzR0N">Pylons of Messina</a></td><td>1957</td><td>Italy</td><td>Messina</td><td>232 m (224 m without basement)</td><td>Not used as pylons any more</td></tr><tr><td>HVDC Yangtze River Crossing Wuhu</td><td>2003</td><td>China</td><td><a href="/facts/Wuhu/qLVaIXlw">Wuhu</a></td><td>229 m</td><td>Tallest electricity pylons used for <a href="/facts/HVDC_Three_Gorges-Changzhou/EJxdTTfQ">HVDC</a></td></tr><tr><td><a href="/facts/Elbe_Crossing_2/KFB9PzcL">Elbe Crossing 2</a></td><td>1976–1978</td><td>Germany</td><td>Stade</td><td>227 m</td><td>Tallest electricity pylons still in use in Europe</td></tr><tr><td><a href="/facts/Chushi_Powerline_Crossing/3Peoz2FK">Chushi Powerline Crossing</a></td><td>1962</td><td>Japan</td><td><a href="/facts/Takehara,_Hiroshima/lKo5jveW">Takehara</a></td><td>226 m</td><td>Tallest electricity pylons in Japan</td></tr><tr><td>Daqi Channel Crossing</td><td>1997</td><td>Japan</td><td>Takehara</td><td>223 m</td><td></td></tr><tr><td><a href="/facts/Overhead_line_crossing_Suez_Canal/oBQ0aFvD">Overhead line crossing Suez Canal</a></td><td>1998</td><td><a href="/facts/Egypt/8Ttg0JwB">Egypt</a></td><td></td><td>221 m</td><td></td></tr><tr><td>Huainan Luohe Powerline Crossing</td><td>1989</td><td>China</td><td><a href="/facts/Huainan/o7kcbcCG">Huainan</a></td><td>202.5 m</td><td>Pylons of reinforced concrete</td></tr><tr><td>Yangzi River Crossing of HVDC Xianjiaba – Shanghai</td><td>2009</td><td>China</td><td>???</td><td>202 m<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a></td><td></td></tr><tr><td><a href="/facts/Saratov_Hydroelectric_Station/rNI1vh4h">Balakovo 500 kV Wolga Crossing, Tower East</a></td><td>1983–1984</td><td>Russia</td><td><a href="/facts/Balakovo/BFnlU4YP">Balakovo</a></td><td>197 m</td><td>Tallest electricity pylon in Russia and ex-<a href="/facts/USSR/m7wWsPto">USSR</a></td></tr><tr><td>LingBei Channel Crossing</td><td>1993</td><td>Japan</td><td>Reihoku</td><td>195 m</td><td></td></tr><tr><td>Doel Schelde Powerline Crossing 2</td><td>2019</td><td>Belgium</td><td>Antwerp</td><td>192 m</td><td>Second crossing of Schelde River</td></tr><tr><td><a href="/facts/400_kV_Thames_Crossing/vsuXlrQx">400 kV Thames Crossing</a></td><td>1965</td><td>UK</td><td><a href="/facts/West_Thurrock/Py0uxl70">West Thurrock</a></td><td>190 m</td><td></td></tr><tr><td><a href="/facts/Elbe_Crossing_1/KFB9PzcL">Elbe Crossing 1</a></td><td>1958–1962</td><td>Germany</td><td>Stade</td><td>189 m</td><td></td></tr><tr><td>Antwerp Deurganck dok crossing</td><td>2000</td><td>Belgium</td><td>Antwerp</td><td>178 m</td><td>Crossing of a container quay</td></tr><tr><td>Tracy Saint Lawrence River Powerline Crossing</td><td>?</td><td>Canada</td><td>Tracy</td><td>176 m</td><td>Tallest electricity pylon in Canada</td></tr><tr><td>Línea de Transmisión Carapongo – Carabayllo</td><td>2011</td><td>Peru</td><td>Lima</td><td>170.5 m</td><td>Crossing of Rimac River in a 1055 metres long span</td></tr><tr><td>Doel Schelde Powerline Crossing 1<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a></td><td>1974</td><td>Belgium</td><td>Antwerp</td><td>170 m</td><td>Group of 2 towers with 1 pylon situated in the middle of Schelde River</td></tr><tr><td>Sunshine Mississippi Powerline Crossing</td><td>1967</td><td>United States</td><td>St. Gabriel, Louisiana</td><td>164.6 m</td><td>Tallest electricity pylons in the <a href="/facts/United_States/P0sCdLe5">United States</a><a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a><a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a></td></tr><tr><td>Lekkerkerk Crossing 1</td><td>1970</td><td>Netherlands</td><td>Lekkerkerk</td><td>163 m</td><td>Tallest crossing in the Netherlands</td></tr><tr><td><a href="/facts/Bosporus_overhead_line_crossing_III/T3fCsrXr">Bosporus overhead line crossing III</a></td><td>1999</td><td>Turkey</td><td>Istanbul</td><td>160 m</td><td></td></tr><tr><td><a href="/facts/Saratov_Hydroelectric_Station/rNI1vh4h">Balakovo 500 kV Wolga Crossing, Tower West</a></td><td>1983–1984</td><td>Russia</td><td><a href="/facts/Balakovo/BFnlU4YP">Balakovo</a></td><td>159 m</td><td></td></tr><tr><td><a href="/facts/Pylons_of_Cadiz/5LM3MW4d">Pylons of Cadiz</a></td><td>1957–1960</td><td>Spain</td><td>Cadiz</td><td>158 m</td><td></td></tr><tr><td>Maracaibo Bay Powerline Crossing</td><td>?</td><td><a href="/facts/Venezuela/eX1qnkln">Venezuela</a></td><td>Maracaibo</td><td>150 m</td><td>Towers on caissons</td></tr><tr><td>Meredosia-Ipava Illinois River Crossing</td><td>2017</td><td>United States</td><td>Beardstown</td><td>149.35 m</td><td></td></tr><tr><td><a href="/facts/Aust_Severn_Powerline_Crossing/gpJHT8w7">Aust Severn Powerline Crossing</a></td><td>1959</td><td>UK</td><td>Aust</td><td>148.75 m</td><td></td></tr><tr><td><a href="/facts/400_kV_Thames_Crossing/vsuXlrQx">132 kV Thames Crossing</a></td><td>1932</td><td>UK</td><td><a href="/facts/West_Thurrock/Py0uxl70">West Thurrock</a></td><td>148.4 m</td><td>Demolished in 1987</td></tr><tr><td>Karmsundet Powerline Crossing</td><td>?</td><td>Norway</td><td>Karmsundet</td><td>143.5 m</td><td></td></tr><tr><td>Limfjorden Overhead powerline crossing 2</td><td>?</td><td>Denmark</td><td>Raerup</td><td>141.7 m</td><td></td></tr><tr><td><a href="/facts/Saint_Lawrence_River_HVDC_Powerline_Crossing/06wQgqF5">Saint Lawrence River HVDC Quebec-New England Overhead Powerline Crossing</a></td><td>1989</td><td>Canada</td><td><a href="/facts/Deschambault-Grondines,_Quebec/TxWBI8vs">Deschambault-Grondines</a></td><td>140 m</td><td>Dismantled in 1992</td></tr><tr><td>Pylons of Voerde</td><td>1926</td><td>Germany</td><td>Voerde</td><td>138 m</td><td></td></tr><tr><td>Köhlbrand Powerline Crossing</td><td>?</td><td>Germany</td><td>Hamburg</td><td>138 m</td><td></td></tr><tr><td>Bremen-Farge Weser Powerline Crossing</td><td>?</td><td>Germany</td><td><a href="/facts/Bremen/y56P3Pyk">Bremen</a></td><td>135 m</td><td></td></tr><tr><td>Pylons of Ghesm Crossing</td><td>1984</td><td><a href="/facts/Iran/24yukge8">Iran</a></td><td>Strait of Ghesm</td><td>130 m</td><td>One pylon standing on a caisson in the sea</td></tr><tr><td><a href="/facts/Shukhov_tower_on_the_Oka_River/9vqwXgKG">Shukhov tower on the Oka River</a></td><td>1929</td><td>Russia</td><td><a href="/facts/Dzerzhinsk,_Russia/G6XCc2Gz">Dzerzhinsk</a></td><td>128 m</td><td><a href="/facts/Hyperboloid_structure/xVfUDnhV">Hyperboloid structure</a>, 2 towers, one of them demolished</td></tr><tr><td>Tarchomin pylon of <a href="/facts/Power_line_crossings_in_Poland/Rd9vkXVj">Tarchomin-Łomianki Vistula Powerline Crossing</a></td><td>?</td><td>Poland</td><td><a href="/facts/Tarchomin/WJ7eeHnQ">Tarchomin</a></td><td>127 m</td><td></td></tr><tr><td>Skolwin pylon of <a href="/facts/Power_line_crossings_in_Poland/Rd9vkXVj">Skolwin-Inoujscie Odra Powerline Crossing</a></td><td>?</td><td>Poland</td><td><a href="/facts/Skolwin/7EtBNQ8J">Skolwin</a></td><td>126 m</td><td></td></tr><tr><td><a href="/facts/Enerhodar_Dnipro_Powerline_Crossing/AcV1Y49t">Enerhodar Dnipro Powerline Crossing</a> 2</td><td>1977</td><td>Ukraine</td><td><a href="/facts/Enerhodar/WQ0TuRvA">Enerhodar</a></td><td>126 m</td><td></td></tr><tr><td>Inoujscie pylon of <a href="/facts/Power_line_crossings_in_Poland/Rd9vkXVj">Skolwin-Inoujscie Odra Powerline Crossing</a></td><td>?</td><td>Poland</td><td><a href="/facts/Inoujscie/Uo554Lub">Inoujscie</a></td><td>125 m</td><td></td></tr><tr><td><a href="/facts/Bosporus_overhead_line_crossing_II/T3fCsrXr">Bosporus overhead line crossing II</a></td><td>1983</td><td>Turkey</td><td>Istanbul</td><td>124 m</td><td></td></tr><tr><td>Tista River Crossing</td><td>1985</td><td>India</td><td>Jalpaiguri</td><td>120 m</td><td>Pile foundation</td></tr><tr><td>Duisburg-Wanheim Powerline Rhine Crossing</td><td>?</td><td>Germany</td><td><a href="/facts/Duisburg/pbQ3cwal">Duisburg</a></td><td>122 m</td><td></td></tr><tr><td>Łomianki pylon of <a href="/facts/Power_line_crossings_in_Poland/Rd9vkXVj">Tarchomin-Łomianki Vistula Powerline Crossing</a></td><td>?</td><td>Poland</td><td><a href="/facts/%C5%81omianki/yWlEIhtb">Łomianki</a></td><td>121 m</td><td></td></tr><tr><td>Little Belt Overhead powerline crossing 2</td><td>?</td><td>Denmark</td><td>Middelfart</td><td>125.3 m / 119.2 m</td></tr><tr><td>Little Belt Overhead powerline crossing 2</td><td>?</td><td>Denmark</td><td>Middelfart</td><td>119.5 m / 113.1 m</td></tr><tr><td>Pylons of Duisburg-Rheinhausen</td><td>1926</td><td>Germany</td><td>Duisburg-Rheinhausen</td><td>118.8 m</td><td></td></tr><tr><td>Bullenhausen Elbe Powerline Crossing</td><td>?</td><td>Germany</td><td>Bullenhausen</td><td>117 m</td><td></td></tr><tr><td><a href="/facts/Power_line_crossings_in_Poland/Rd9vkXVj">Lubaniew-Bobrowniki Vistula Powerline Crossing</a></td><td>?</td><td>Poland</td><td>Lubaniew/<a href="/facts/Bobrowniki/eLQQLNpw">Bobrowniki</a></td><td>117 m</td><td></td></tr><tr><td><a href="/facts/Power_line_crossings_in_Poland/Rd9vkXVj">Świerże Górne-Rybaków Vistula Powerline Crossing</a></td><td>?</td><td>Poland</td><td><a href="/facts/%C5%9Awier%C5%BCe_G%C3%B3rne/BIpWWcHm">Świerże Górne</a>/Rybaków</td><td>116 m</td><td></td></tr><tr><td><a href="/facts/Power_line_crossings_in_Poland/Rd9vkXVj">Ostrówek-Tursko Vistula Powerline Crossing</a></td><td>?</td><td>Poland</td><td><a href="/facts/Ostr%C3%B3wek,_Mielec_County/z6XogXXu">Ostrówek</a>/<a href="/facts/Tursko_Male/3flPY6q8">Tursko</a></td><td>115 m</td><td></td></tr><tr><td><a href="/facts/Bosporus_overhead_line_crossing_I/T3fCsrXr">Bosporus overhead line crossing I</a></td><td>1957</td><td>Turkey</td><td>Istanbul</td><td>113 m</td><td></td></tr><tr><td><a href="/facts/Riga_Hydroelectric_Power_Plant_Crossing_Pylon/KufvsA38">Riga Hydroelectric Power Plant Crossing Pylon</a></td><td>1974</td><td>Latvia</td><td>Salaspils</td><td>112 m</td><td></td></tr><tr><td>Bremen-Industriehafen Weser Powerline Crossing</td><td>?</td><td>Germany</td><td>Bremen</td><td>111 m</td><td>Two parallel running powerlines, one used for a single phase AC powerline of Deutsche Bahn AG</td></tr><tr><td>Probostwo Dolne pylon of Nowy Bógpomóz-Probostwo Dolne Vistula Powerline Crossing</td><td>?</td><td>Poland</td><td>Nowy Bógpomóz/<a href="/facts/Probostwo_Dolne/CEDfvEA8">Probostwo Dolne</a></td><td>111 m</td><td></td></tr><tr><td>Ameren UE Tower</td><td>2009</td><td>United States</td><td><a href="/facts/St._Louis,_Missouri/22beLecX">St. Louis, Missouri</a></td><td>111 m</td><td>Radio tower with crossbars for powerline conductors</td></tr><tr><td>Daugava Powerline Crossing</td><td>1975</td><td>Latvia</td><td><a href="/facts/Riga/PCWbJn2h">Riga</a></td><td>110 m</td><td></td></tr><tr><td><a href="/facts/Ems_powerline_crossing/s9zUKbag">380 kV Ems Overhead Powerline Crossing</a></td><td>?</td><td>Germany</td><td><a href="/facts/Baruth/Mark/Te2afG2l">Mark</a> (south of <a href="/facts/Weener/d9XDdD2N">Weener</a>)</td><td>110 m</td><td></td></tr><tr><td>Nowy Bógpomóz pylon of <a href="/facts/Power_line_crossings_in_Poland/Rd9vkXVj">Nowy Bógpomóz-Probostwo Dolne Vistula Powerline Crossing</a></td><td>?</td><td>Poland</td><td>Nowy Bógpomóz</td><td>109 m</td><td></td></tr><tr><td><a href="/facts/Power_line_crossings_in_Poland/Rd9vkXVj">Regów Golab Vistula Powerline Crossing</a></td><td>?</td><td>Poland</td><td><a href="/facts/Reg%C3%B3w/rj1bd9Jk">Regów</a>/Golab</td><td>108 m</td><td></td></tr><tr><td>Orsoy Rhine Crossing</td><td>?</td><td>Germany</td><td><a href="/facts/Orsoy/7nyuJs5Q">Orsoy</a></td><td>105 m</td><td></td></tr><tr><td><a href="/facts/Kerinchi_Pylon/Pxna6Qog">Kerinchi Pylon</a></td><td>1999</td><td><a href="/facts/Malaysia/8zbUMzCP">Malaysia</a></td><td><a href="/facts/Kerinchi/R4QAkk2u">Kerinchi</a></td><td>103 m</td><td>Tallest strainer pylon in the world, not part of a powerline crossing of a waterway</td></tr><tr><td>Limfjorden Overhead powerline crossing 1</td><td>?</td><td>Denmark</td><td>Raerup</td><td>101.2 m</td><td></td></tr><tr><td><a href="/facts/Enerhodar_Dnipro_Powerline_Crossing/AcV1Y49t">Enerhodar Dnipro Powerline Crossing</a> 2</td><td>1977</td><td>Ukraine</td><td>Enerhodar</td><td>100 m</td><td>Pylons standing on caissons</td></tr><tr><td><a href="/facts/Reisholz_Rhine_Powerline_Crossing/9mYNubQt">Reisholz Rhine Powerline Crossing</a></td><td>1917</td><td>Germany</td><td><a href="/facts/D%C3%BCsseldorf/twteRHCh">Düsseldorf</a></td><td>?</td><td>Under the legs of the pylon on the east shore of Rhine there runs the rail to nearby Holthausen substation.</td></tr><tr><td>Sone River Crossing</td><td>1983</td><td>India</td><td>Sone Bhadra (Uttar Pradesh)</td><td>96 m</td><td>Pylons standing on well foundation</td></tr><tr><td>Ghazi pond crossing <a href="/facts/Tarbela_Dam/4CBsnWSG">Tarbela Dam</a></td><td>2017</td><td>Pakistan</td><td>Tarbela Dam</td><td>89.5m</td><td>SPT type tower. First of its type in Pakistan.</td></tr><tr><td>Al Batinah expressway road & rail crossing at Sohar 220 kV Double circuit OETC line</td><td>2018</td><td>Oman</td><td>Sohar</td><td>89 m</td><td>Tallest transmission line tower in Sultanate of Oman</td></tr><tr><td>Strelasund Powerline Crossing</td><td>?</td><td>Germany</td><td><a href="/facts/Sundhagen/gauT7uyp">Sundhagen</a></td><td>85 m</td><td>Pylons standing on caissons</td></tr><tr><td><a href="/facts/Pylon_in_the_artificial_lake_of_Santa_Maria/XNBq4sm3">Pylon in the artificial lake of Santa Maria</a></td><td>1959</td><td>Switzerland</td><td>Lake of Santa Maria</td><td>75 m</td><td>Pylon in an artificial lake</td></tr><tr><td><a href="/facts/H%C3%BCrth/N9xI6Qo7">Facility 4101, Tower 93</a></td><td>1975</td><td>Germany</td><td><a href="/facts/H%C3%BCrth/N9xI6Qo7">Hürth</a></td><td>74.84 m</td><td>Carried until 2010 an observation deck</td></tr><tr><td><a href="/facts/Zaporizhzhia_Pylon_Triple/knLD3g82">Zaporizhzhia Pylon Triple</a></td><td>?</td><td><a href="/facts/Ukraine/Qof0uqAj">Ukraine</a></td><td>Zaporizhzhia</td><td>74.5 m</td><td>Two triple pylons used for a powerline crossing from <a href="/facts/Khortytsia_Island/so3vjATC">Khortytsia Island</a> to the east shore of Dneipr</td></tr><tr><td>Aggersund Crossing of <a href="/facts/Cross-Skagerrak/uQlPXohM">Cross-Skagerrak</a></td><td>1977</td><td>Denmark</td><td><a href="/facts/Aggersund/80ced4XF">Aggersund</a></td><td>70 m</td><td>Tallest pylons used for HVDC-transmission in Europe</td></tr><tr><td>Eyachtal Span</td><td>1992</td><td>Germany</td><td>Höfen</td><td>70 m</td><td>Longest span of Germany (1444 metres)</td></tr><tr><td>Leaning pylon of Mingjian</td><td>?</td><td>Taiwan</td><td>Mingjian</td><td>?</td><td>Earthquake memorial</td></tr><tr><td><a href="/facts/Carquinez_Strait_Powerline_Crossing/jsDr5kHD">Carquinez Strait Powerline Crossing</a></td><td>1901</td><td>United States</td><td><a href="/facts/Benicia/19M7aGJy">Benicia</a></td><td>68 m + 20 m</td><td>World's first powerline crossing of a larger waterway</td></tr><tr><td>Tower 1 of Powerline Reuter-West - Reuter</td><td>1987</td><td>Germany</td><td>Berlin</td><td>61.3 m</td><td>Chimney-like strainer, however not useable as smokestack, design was chosen in order to fit better into the surrounding industrial area</td></tr><tr><td>Pylon 310 of powerline Innertkirchen-Littau-Mettlen</td><td>1990</td><td>Switzerland</td><td>Littau</td><td>59.5 m</td><td>Tallest pylon of prefabricated concrete</td></tr><tr><td><a href="/facts/Huddersfield_Narrow_Canal_Pylon/SFntGFqu">Huddersfield Narrow Canal Pylon</a></td><td>1967</td><td>UK</td><td>Stalybridge, Greater Manchester</td><td>54.6 m</td><td>Pylon standing over a waterway shipable by small boats</td></tr><tr><td>Anlage 2610, Mast 69</td><td>?</td><td>Germany</td><td><a href="/facts/Bochum/fMKgcuJK">Bochum</a></td><td>47 m</td><td>Pylon of 220 kV powerline decorated with balls in Ruhr-Park mall</td></tr><tr><td>Colossus of Eislingen</td><td>1980</td><td>Germany</td><td>Eislingen/Fils</td><td>47 m</td><td>Pylon standing over a small river</td></tr><tr><td>Pylon 24 of powerline Watari-Kashiwabara</td><td>?</td><td>Japan</td><td>Uchihara, Ibaraki</td><td>45 m</td><td>Pylon standing over a public road with two lanes</td></tr><tr><td><a href="/facts/Bog_Fox/gK7VV47u">Designer high-voltage pylon Bog Fox</a></td><td>2020</td><td><a href="/facts/Estonia/PVjB16TI">Estonia</a></td><td><a href="/facts/Risti,_Estonia/erHKjjpy">Risti</a>, <a href="/facts/L%C3%A4%C3%A4ne_County/23PkHlfM">Lääne County</a></td><td>45 m</td><td>The first high-voltage designer pylon in Estonia</td></tr><tr><td>Sookurg</td><td>2022</td><td><a href="/facts/Estonia/PVjB16TI">Estonia</a></td><td>Tartu-Tiksoja, Tähtvere County</td><td>44 m</td><td>Designer pylon</td></tr><tr><td>Sookureke</td><td>2023</td><td><a href="/facts/Estonia/PVjB16TI">Estonia</a></td><td>Jõhvi–Tartu–Valga, Mustvee County</td><td>40 m</td><td>Designer pylon</td></tr><tr><td><a href="/facts/Mickey_Pylon/8Dy7fvAT">Mickey Pylon</a></td><td>1996</td><td>US</td><td><a href="/facts/Celebration,_Florida/z0u6T0Kg">Celebration, Florida</a></td><td>32 m</td><td>Mickey Mouse shaped pylon</td></tr><tr><td>Source<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a></td><td>2004</td><td>France</td><td>Amnéville les Thermes</td><td>34 m / 28 m</td><td>4 pylons forming an artwork</td></tr><tr><td>Tower 9108</td><td>1983</td><td>Germany</td><td><a href="/facts/Fulda/htCT8t5s">Fulda</a></td><td>20.4 m</td><td>Base situated in a storage building, looks like roof-mounted</td></tr><tr><td>Western Tower of Overhead Line of <a href="/facts/Straussee_Ferry/bua7Sw7M">Ostrich Lake Ferry</a></td><td>1915</td><td>Germany</td><td>Strausberg</td><td>9.7 m</td><td>Carries together with its counterpart on the other bank of Ostrich Lake the longest span (length: 370 metres) of an overhead wire for feeding electric power to a vehicle</td></tr><tr><td>Eastern Tower of Overhead Line of <a href="/facts/Straussee_Ferry/bua7Sw7M">Ostrich Lake Ferry</a></td><td>2006</td><td>Germany</td><td>Strausberg</td><td>9.6 m</td><td>Carries together with its counterpart on the other bank of Ostrich Lake the longest span (length: 370 metres) of an overhead wire for feeding electric power to a vehicle</td></tr></tbody></table> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Architectural_engineering/p66IyqCY">Architectural engineering</a></li> <li><a href="/facts/List_of_high_voltage_underground_and_submarine_cables/rP8huH0X">List of high voltage underground and submarine cables</a></li> <li><a href="/facts/List_of_spans/9mYNubQt">List of spans</a></li> <li><a href="/facts/Live-line_working/T1BovXqG">Live-line working</a></li> <li><a href="/facts/Stobie_pole/Qxnjj6mJ">Stobie pole</a></li> <li><a href="/facts/Structural_engineering/Wj1vpoGh">Structural engineering</a></li> <li><a href="/facts/Traction_current_pylon/JHgXE6ds">Traction current pylon</a></li> <li><a href="/facts/Utility_pole/wRPdk0VI">Utility pole</a></li></ul> <h2 id="external-links">External links</h2> Wikimedia Commons has media related to Electricity pylons. <ul><li><a href="http://myinsulators.com/hungary/index.html">Electricity pylons in Hungary</a></li> <li><a href="http://www.pylons.org/">Pylon Appreciation Society</a></li> <li><a href="http://en.structurae.de/structures/ftype/index.cfm?id=2018">Structurae database of select notable transmission towers</a></li> <li><a href="http://novoklimov.io.ua/">Pylons in Russia and other areas of former Soviet Union</a></li> <li><a href="https://www.bbc.co.uk/news/uk-32234656">Meet the 'pylon spotters' – BBC News</a></li> <li><a href="https://www.youtube.com/watch?v=a9zdz780l-U">Documentary on erecting towers in New Zealand</a> on YouTube</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Environmental, Health, and Safety Guidelines for Electric Power Transmission and Distribution" (PDF). International Finance Corporation. 2007-04-30. p. 21. Retrieved 2013-09-15. <a href="http://www.ifc.org/wps/wcm/connect/66b56e00488657eeb36af36a6515bb18/Final%2B-%2BElectric%2BTransmission%2Band%2BDistribution.pdf?MOD=AJPERES&id=1323162154847" target="_blank">http://www.ifc.org/wps/wcm/connect/66b56e00488657eeb36af36a6515bb18/Final%2B-%2BElectric%2BTransmission%2Band%2BDistribution.pdf?MOD=AJPERES&id=1323162154847</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Environmental, Health, and Safety Guidelines for Electric Power Transmission and Distribution" (PDF). International Finance Corporation. 2007-04-30. p. 21. Retrieved 2013-09-15. <a href="http://www.ifc.org/wps/wcm/connect/66b56e00488657eeb36af36a6515bb18/Final%2B-%2BElectric%2BTransmission%2Band%2BDistribution.pdf?MOD=AJPERES&id=1323162154847" target="_blank">http://www.ifc.org/wps/wcm/connect/66b56e00488657eeb36af36a6515bb18/Final%2B-%2BElectric%2BTransmission%2Band%2BDistribution.pdf?MOD=AJPERES&id=1323162154847</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"The Case for an Environmentalism that Builds". The Economist. ISSN 0013-0613. Retrieved 2023-10-03. <a href="https://www.economist.com/leaders/2023/04/05/the-case-for-an-environmentalism-that-builds" target="_blank">https://www.economist.com/leaders/2023/04/05/the-case-for-an-environmentalism-that-builds</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"The looming battle over pylons for green energy". BBC News. 31 July 2023. <a href="https://www.bbc.co.uk/news/uk-scotland-scotland-business-66336599" target="_blank">https://www.bbc.co.uk/news/uk-scotland-scotland-business-66336599</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"Building a Better Transmission Tower". Department of Energy. Retrieved 2021-07-13. <a href="https://www.energy.gov/articles/building-better-transmission-tower" target="_blank">https://www.energy.gov/articles/building-better-transmission-tower</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"Everything you ever wanted to know about electricity pylons | National Grid Group". www.nationalgrid.com. Retrieved 2021-07-13. <a href="https://www.nationalgrid.com/stories/grid-work-stories/everything-you-ever-wanted-know-about-electricity-pylons" target="_blank">https://www.nationalgrid.com/stories/grid-work-stories/everything-you-ever-wanted-know-about-electricity-pylons</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Barber, Katherine, ed. (1998). The Canadian Oxford dictionary. Toronto; New York: Oxford University Press. p. 695. ISBN 0-19-541120-X. <a href="0-19-541120-X" target="_blank">0-19-541120-X</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Canada, Natural Resources (2017-10-06). "electricity-facts". www.nrcan.gc.ca. Retrieved 2021-07-13. <a href="https://www.nrcan.gc.ca/science-data/data-analysis/energy-data-analysis/energy-facts/electricity-facts/20068" target="_blank">https://www.nrcan.gc.ca/science-data/data-analysis/energy-data-analysis/energy-facts/electricity-facts/20068</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Circuit Model of Vertical Double-Circuit Transmission Tower and Line for Lightning Surge Analysis Considering TEM-mode Formation. IEEE Conference Publication. IEEE. Retrieved 17 February 2025. <a href="https://ieeexplore.ieee.org/document/9160536/" target="_blank">https://ieeexplore.ieee.org/document/9160536/</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>"Convert from AC to HVDC for higher power transmission". ABB Review: 64–69. 2018. Retrieved 20 June 2020. <a href="https://search.abb.com/library/Download.aspx?DocumentID=9AKK107046A8857&LanguageCode=en&DocumentPartId=&Action=Launch" target="_blank">https://search.abb.com/library/Download.aspx?DocumentID=9AKK107046A8857&LanguageCode=en&DocumentPartId=&Action=Launch</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>Liza Reed; Granger Morgan; Parth Vaishnav; Daniel Erian Armanios (9 July 2019). "Converting existing transmission corridors to HVDC is an overlooked option for increasing transmission capacity". Proceedings of the National Academy of Sciences. 116 (28): 13879–13884. doi:10.1073/pnas.1905656116. PMC 6628792. PMID 31221754. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6628792" target="_blank">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6628792</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>"World's first T-pylon is installed in UK". Nuclear Engineering International. 26 October 2021. Retrieved 26 October 2021. <a href="https://www.neimagazine.com/news/newsworlds-first-t-pylon-is-installed-in-uk-9185366" target="_blank">https://www.neimagazine.com/news/newsworlds-first-t-pylon-is-installed-in-uk-9185366</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p>"The T-Pylon". BYSTRUP. 2021. Retrieved 16 November 2022. <a href="https://www.powerpylons.com/t-pylon" target="_blank">https://www.powerpylons.com/t-pylon</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p>"UK gets first new-style pylons in a century". BBC News. 2022-03-15. Retrieved 2022-03-21. <a href="https://www.bbc.com/news/science-environment-60754357" target="_blank">https://www.bbc.com/news/science-environment-60754357</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>"The winner of a new generation of electricity pylons is announced". the Guardian. 2011-10-14. ISSN 0261-3077. Retrieved 2023-08-22. <a href="https://www.theguardian.com/environment/gallery/2011/sep/14/shortlist-designs-electricity-pylons-in-pictures" target="_blank">https://www.theguardian.com/environment/gallery/2011/sep/14/shortlist-designs-electricity-pylons-in-pictures</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>"[Hot Item] Megatro Y-Shaped Transmission Pylons". <a href="https://towerproduct.en.made-in-china.com/product/BvznSKHAgDrt/China-Megatro-Y-Shaped-Transmission-Pylons.html" target="_blank">https://towerproduct.en.made-in-china.com/product/BvznSKHAgDrt/China-Megatro-Y-Shaped-Transmission-Pylons.html</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>Donald Fink and Wayne Beaty (ed.) Standard Handbook for Electrical Engineers 11th Ed., Mc Graw Hill, 1978, ISBN 0-07-020974-X, pp. 14-102 and 14-103 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>Donald Fink and Wayne Beaty (ed.) Standard Handbook for Electrical Engineers 11th Ed., Mc Graw Hill, 1978, ISBN 0-07-020974-X, pp. 14-102 and 14-103 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> <li id="fn:19"><p>"Archived copy" (PDF). Archived from the original (PDF) on 2015-02-02. Retrieved 2015-02-02.{{cite web}}: CS1 maint: archived copy as title (link) <a href="https://web.archive.org/web/20150202201627/http://www.spta.org/pdf/Reisdorff%20Lam%20%209-11.pdf" target="_blank">https://web.archive.org/web/20150202201627/http://www.spta.org/pdf/Reisdorff%20Lam%20%209-11.pdf</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></p></li> <li id="fn:20"><p>Olive Development. "Winterport, Maine". Archived from the original on 2016-03-03. Retrieved 2015-02-02. <a href="https://web.archive.org/web/20160303235309/http://www.mainepower.com/winterport.htm" target="_blank">https://web.archive.org/web/20160303235309/http://www.mainepower.com/winterport.htm</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></p></li> <li id="fn:21"><p>The electricity pylon designs of the world - an overview - HoogspanningsNet Forum <a href="https://www.hoogspanningsforum.com/viewtopic.php?p=36124" target="_blank">https://www.hoogspanningsforum.com/viewtopic.php?p=36124</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></p></li> <li id="fn:22"><p>[1] <a href="https://commons.wikimedia.org/wiki/File:Mast9108.jpg" target="_blank">https://commons.wikimedia.org/wiki/File:Mast9108.jpg</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></p></li> <li id="fn:23"><p>[:File:Mast9108-Fundament.jpg] <a href="#fnref:23" class="footnote-back-ref">↩</a></p></li> <li id="fn:24"><p>"New High Voltage Pylons for the Netherlands". 2009. Retrieved 2010-04-24. <a href="http://www.zwarts.jansma.nl/artefact-2410-en.html" target="_blank">http://www.zwarts.jansma.nl/artefact-2410-en.html</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></p></li> <li id="fn:25"><p>"Clown-shaped High Voltage Pylons in Hungary".47°14′09″N 19°23′27″E / 47.2358442°N 19.3907302°E / 47.2358442; 19.3907302 (Clown-shaped pylon) <a href="http://www.orientpress.hu/portals/orientpress.hu/keptar/nagy/90675_bohoc.jpg" target="_blank">http://www.orientpress.hu/portals/orientpress.hu/keptar/nagy/90675_bohoc.jpg</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></p></li> <li id="fn:26"><p>Rudell, Tim (2016-06-28). "Drive Through Goal Posts at the Pro Football Hall of Fame". WKSU. Retrieved 2019-07-14.40°49′03″N 81°23′48″W / 40.8174274°N 81.3966678°W / 40.8174274; -81.3966678 (Goal post pylons) <a href="https://www.wksu.org/post/drive-through-goal-posts-pro-football-hall-fame" target="_blank">https://www.wksu.org/post/drive-through-goal-posts-pro-football-hall-fame</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></p></li> <li id="fn:27"><p>Broadcast Tower Technologies. "Gin Pole Services". Retrieved 2009-10-24. <a href="http://www.tower-technologies.com/GinPole.htm" target="_blank">http://www.tower-technologies.com/GinPole.htm</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></p></li> <li id="fn:28"><p>"Powering Up – Vertical Magazine". verticalmag.com. Archived from the original on 4 October 2015. Retrieved 4 October 2015. <a href="http://www.verticalmag.com/news/article/PoweringUp" target="_blank">http://www.verticalmag.com/news/article/PoweringUp</a> <a href="#fnref:28" class="footnote-back-ref">↩</a></p></li> <li id="fn:29"><p>"Helicopter Transport of Transmission Towers". Transmission & Distribution World. 21 May 2018. <a href="https://www.tdworld.com/td-how/helicopter-transport-transmission-towers" target="_blank">https://www.tdworld.com/td-how/helicopter-transport-transmission-towers</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></p></li> <li id="fn:30"><p>"Chapter 6. Visual aids for denoting obstacles" (PDF). Annex 14 Volume I Aerodrome design and operations. International Civil Aviation Organization. 2004-11-25. pp. 6–3, 6–4, 6–5. Retrieved 1 June 2011. 6.2.8 ... spherical ... diameter of not less than 60 cm. ... 6.2.10 ... should be of one colour. ... Figure 6-2 ... 6.3.13 <a href="http://www.avaids.com/icao.pdf" target="_blank">http://www.avaids.com/icao.pdf</a> <a href="#fnref:30" class="footnote-back-ref">↩</a></p></li> <li id="fn:31"><p>American Society of Civil Engineers Design of latticed steel transmission structures ASCE Standard 10-97, 2000, ISBN 0-7844-0324-4, section C2.3 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:31" class="footnote-back-ref">↩</a></p></li> <li id="fn:32"><p>Donald Fink and Wayne Beaty (ed.) Standard Handbook for Electrical Engineers 11th Ed., Mc Graw Hill, 1978, ISBN 0-07-020974-X, pp. 14-102 and 14-103 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:32" class="footnote-back-ref">↩</a></p></li> <li id="fn:33"><p>"World's 2nd tallest power transmission towers in West Bengal". The Economic Times. 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