Interconnector
{{Short description|Structure enabling energy to flow between networks}}
{{For|fuel pipelines|Pipeline transport}}
{{Power engineering}}
An interconnector (also known as a DC tie in the USA{{Cite web|title=CONNECTING THE GRID: DC TIES SERVE CRITICAL ROLE|url=https://www.nmppenergy.org/energy-education/connecting-grid-dc-ties-serve-critical-role|access-date=2022-11-27|website=www.nmppenergy.org}}) is a structure which enables high-voltage DC electricity to flow between electrical grids, connecting separate AC networks, or linking synchronous grids.[https://www.ofgem.gov.uk/electricity/transmission-networks/electricity-interconnectors Electricity interconnectors ofgem][https://www.iea.org/publications/freepublications/publication/Interconnection.pdf LARGE-SCALE ELECTRICITY INTERCONNECTION 2016] It may be formed of submarine power cables, underground power cables or overhead power lines.
The longest interconnection as of July 2022 was the {{convert|2210|km|mi|abbr=on}} Hami - Zhengzhou delivering 8 GW of high voltage direct current power. The longest proposed connector is the {{convert|3800|km|mi|abbr=on}}, 3.6 GW Xlinks Morocco-UK Power Project.{{cite web |title=The Morocco - UK Power Project |url=https://xlinks.co/morocco-uk-power-project/ |website=xlinks.co |access-date=3 July 2022}}
Economy
Interconnectors allow the trading of electricity between territories. For example, the East–West Interconnector allows the trading of electricity between Great Britain and Ireland. A territory which generates more energy than it requires for its own activities can therefore sell surplus energy to a neighbouring territory.
Interconnectors also provide increased resilience. Within the European Union there is a movement towards a single market for energy, which makes interconnectors viable.European Commission, http://ec.europa.eu/energy/gas_electricity/internal_market_en.htm They are essential to achieve security of supply.{{Cite web |date=2023-01-31 |title=European Electricity Review 2023 |url=https://ember-climate.org/insights/research/european-electricity-review-2023/ |access-date=2023-02-02 |website=Ember |language=en-US}} As such, the Nordic and Baltic energy exchange Nord Pool Spot rely on multiple interconnectors. The fullest possible implementation of this is the proposed European super grid which would include numerous interconnectors between national networks.
Interconnectors are used to increase the security of the energy supply and to manage peak demand. They enable cross-border access to the producers and consumers of electricity, thus increasing the competition in energy markets. They also help integrate more electricity generated from renewable sources,[https://www.lemondedelenergie.com/grande-bretagne-france-interconnexion-electrique-justice/2018/10/16/ GB/France : un projet d’interconnexion dans les tuyaux... de la justice], www.lemondedelenergie.com thus reducing the use of fossil fuel power plants and {{CO2}} emissions. Interconnectors aid adaptation to changing demand patterns such as the uptake of electric vehicles.
Infrastructure
[[Image:HVDC Europe.svg|thumb|right|upright=1.6|
{{legend|#F80E34|Existing links}}
{{legend|#10BF45|Under construction}}
{{legend|#0E25F8|Proposed}}
Many of these HVDC lines transfer power from renewable sources such as hydro and wind. For names, see also the annotated version.]]
Interconnectors may run across a land border or connect two land areas separated by water. As of July 2022 there are at least 35 international connectors and many more intra-national connectors, see high-voltage direct-current (HVDC) projects.