HVDC Moyle

The HVDC Moyle Interconnector is the 500 MW HVDC link between Auchencrosh, South Ayrshire in Scotland and Ballycronan More, County Antrim in Northern Ireland, which went into service in 2001. It is owned and operated by Mutual Energy.

Mutual Energy is a mutual company which manages the Moyle Interconnector (and some high pressure gas transmission assets including the Scotland - Northern Ireland Pipeline) for the benefit of Northern Ireland's energy consumers.

Work was completed in 2016 to replace the subsea sections of the LV return conductors with two new return cables. This was carried out by Nexans (Norway) with the aid of Morrows (N.I) and Romac Civil Engineering (N.I).

HVDC Moyle
Aerial photograph of area where Moyle Ballycronan More HVDC converter station is. It is situated left-up the power station
Aerial photograph of area where Moyle Ballycronan More HVDC converter station is. It is situated left-up the power station
CountryUnited Kingdom
(Scotland & N. Ireland)
FromAuchencrosh, South Ayrshire
ToBallycronan More, County Antrim
Ownership information
OwnerMutual Energy
Construction information
Technical information
TypeSubmarine cable
Type of currentHVDC
Total length63.5 km (39.5 mi)
Power rating500 MW
DC voltage250 kV
No. of poles2


The HVDC Moyle Interconnector has a capacity of 500 MW. It consists of two coaxial 250 kV DC cables with integrated return conductors (IRC), each cable having a transmission capacity of 250 MW. The IRCs have failed through the events below, and their function restored by laying separate return conductors.[1] The converter stations are equipped with light-triggered thyristors.[2]

The converter station at Auchencrosh is connected via a 64 kilometres (40 mi) single-circuit 275 kV overhead three-phase AC line, which is installed on delta-type pylon, to Coylton substation, where the connection with the high voltage grid of Great Britain takes place. The connection to Northern Ireland is then made through dual 63.5-kilometre (39.5 mi) long monopolar cables, of which 55 kilometres (34 mi) are submarine cables. The Ballycronan More converter station is connected into the Northern Ireland grid through two 275 kV circuits.

In August 2011, the interconnector went out of service.[3] Repairs were made[4] and the cable became operational again with 450 MW in February 2012.[5] However, further faults meant that a major part of the interconnector had to be taken out of service until it could be augmented with the additional return cables, completed in 2016. This restored capacity to the full 500 MW.[6]

In February 2017, the cable suffered another fault, halving capacity to 250 MW.[7] However full capacity was restored in September 2017, following repairs by Nexans.

Intraday capacity trading is not available, but is being discussed.[8]


Site Coordinates
Coylton substation 55°26′49″N 4°25′52″W / 55.44694°N 4.43111°W
Auchencrosh converter station 55°4′10″N 4°58′50″W / 55.06944°N 4.98056°W
Cable enters sea 55°3′30″N 5°2′41″W / 55.05833°N 5.04472°W
Cable leaves sea 54°50′44″N 5°43′20″W / 54.84556°N 5.72222°W
Ballycronan More converter station 54°50′34″N 5°46′11″W / 54.84278°N 5.76972°W

See also


  1. ^ https://www.4coffshore.com/transmission/interconnector-moyle-icid20.html
  2. ^ "HVDC – High Voltage Direct Current Power Transmission" (PDF). Siemens. p. 22.
  3. ^ "Moyle Interconnector fault" (Press release). Mutual Energy. August 26, 2011. Archived from the original on 2011-12-19.
  4. ^ "Update on Moyle cable faults repair" (Press release). Mutual Energy. October 18, 2011. Archived from the original on November 17, 2011.
  5. ^ "Update on Moyle repair progress" (Press release). Mutual Energy. February 20, 2012. Archived from the original on 2012-03-05.
  6. ^ "Decision on long-term repair of Moyle Interconnector cables". Mutual Energy. 13 May 2013. Archived from the original on 2013-08-08. Retrieved 20 November 2013.
  7. ^ "Fault detected with Moyle interconnector". 4c Offshore. 21 February 2017. Retrieved 23 February 2017.
  8. ^ "Charging for interconnector capacity allocated intra-day in SEM" (PDF). February 2012. Archived from the original (PDF) on 2012-10-30.

External links

Ballycronan More

Ballycronan More is a townland of 356 acres in County Antrim, Northern Ireland. It is situated in the civil parish of Islandmagee and the historic barony of Belfast Lower.The HVDC Moyle Interconnector is the HVDC link between Auchencrosh, South Ayrshire in Scotland and Ballycronan More, County Antrim, which went into service in 2001. It is owned and operated by Mutual Energy. The Static Inverter Plant is sited in Ballycronan More.

Ballylumford power station

Ballylumford power station is a natural-gas-fired power station in County Antrim, Northern Ireland, UK. With its main plant generating 600 megawatts of electricity, it is Northern Ireland's largest power station and provides half of the province's power. Overall the station produces 1,316MW. The plant is located at the tip of the Islandmagee peninsula, which separates Larne Lough from the Irish Sea. The lough is a Site of Special Scientific Interest.

The 3 chimneys of the power station are 126 metres tall. East of the station is the static inverter plant of HVDC Moyle, a power cable connecting the system to Great Britain.

British Energy Efficiency Federation

The British Energy Efficiency Federation (or BEEF) was founded in 1996 by the United Kingdom Government to provide a forum for consultation between existing industry associations in the energy sector.

Coal Authority

The Coal Authority is a non-departmental public body of the United Kingdom government.

Energy Institute

The Energy Institute (EI) is a UK chartered professional membership body.

Energy Retail Association

The Energy Retail Association (ERA) was a trade association which promoted the interests of electricity and gas retailers in the domestic market in Great Britain, formed in 2003. In April 2012 it merged with the Association of Electricity Producers and the UK Business Council for Sustainable Energy to become Energy UK.


Expro (officially Expro International Group) is an international oil and gas service company, specializing in well flow management, headquartered in Reading, United Kingdom.

Franco-British Nuclear Forum

The first meeting of the Franco–British Nuclear Forum was held in Paris in November 2007, chaired by the Minister for Energy and the French Industry Minister. The working groups are focusing on specific areas for collaboration. A follow-up meeting on the issue in London was planned for March 2008,[1] but did not take place.[2]

Malcolm Eccles

Malcolm Eccles (born 1969) is a utilities senior executive. Eccles is currently the Chief Executive Officer & Managing Director of the Basslink group based in Melbourne, Australia. Eccles was born in Whitehaven, Cumbria. In addition to his work with Basslink, he also serves as a Non-executive director on the boards of City Gas (Singapore) and Gippsland Water (Australia). He has also been a director and Executive Committee member of the ICPC (International Cable Protection Committee) since 2007.

Eccles has been involved in HVDC and submarine cable technology since 2002. His engineering career commenced in 1986 when he served an apprenticeship with British Nuclear Fuels Ltd (BNFL). He stayed with BNFL for 16 years, leaving the organisation in 2002 to join Siemens PTD (power, transmission & distribution), now called Siemens Energy Sector. He worked with Siemens from 2002 until 2005 splitting his time between managing the O&M contract for the HVDC Moyle Interconnector and developing a services business. He joined Basslink in 2005 originally to recruit and train operational & engineering teams and too ensure the company was ready to operate in the Australian energy market.

National Grid plc sold the Basslink Interconector to CitySpring Infrastructure Trust on 31 August 2007. Eccles was appointed CEO of Basslink on 1 September 2007. Since his appointment as CEO Basslink group has grown and now includes a wholesale telecoms business and an engineering consultancy businesses.

Eccles is actively engaged in the activities of the ICPC (International Cable Protection Committee) & CIGRE (International Council on Large Electric Systems).

Eccles is also a non-executive director of Gippsland Water in Victoria, having been appointed to the board in 2011 by the Minister of Water.

During his time as CEO of Basslink Eccles has received pressure from government and shareholders to increase the reliability of the link, especially with the extended outage from December 2015 to June 2016 and another 2 month outage from March 2018 to May 2018. Eccles and his wife live in Melbourne, Victoria. Sharing their home with one cat and two motorcycles.

National Grid (Great Britain)

In the electricity sector in the United Kingdom the National Grid is the high-voltage electric power transmission network serving Great Britain, connecting power stations and major substations and ensuring that electricity generated anywhere on it can be used to satisfy demand elsewhere. The network covers the great majority of Great Britain and several of the surrounding islands. Notably, it does not cover Ireland; Northern Ireland is part of a single electricity market with the Republic of Ireland.

The GB grid is connected as a wide area synchronous grid nominally running at 50 Hertz. There are also undersea interconnections to other grids in northern France (HVDC Cross-Channel), Northern Ireland (HVDC Moyle), the Isle of Man (the AC Isle of Man to England Interconnector), the Netherlands (DC BritNed) and the Republic of Ireland (the DC EirGrid).

On the breakup of the Central Electricity Generating Board in 1990, the ownership and operation of the National Grid in England and Wales passed to National Grid Company plc, later to become National Grid Transco, and now National Grid plc. In Scotland the grid was already split into two separate entities, one for southern and central Scotland and the other for northern Scotland, connected by interconnectors. The first is owned and maintained by SP Energy Networks, a subsidiary of Scottish Power, and the other by SSE. However, National Grid plc continues to be the transmission system operator for the whole GB grid.

New Electricity Trading Arrangements

New Electricity Trading Arrangements (NETA) is the system of market trading arrangements under which electricity is traded in the United Kingdom's wholesale electricity market as of 27 March 2001. The arrangements provided that parties could trade off their imbalances close to real time.

Opus Energy

Opus Energy Limited supplies gas and electricity to businesses across the United Kingdom. It purchases electricity from wind, solar, hydro, and anaerobic digestion generators, and provides support to develop energy-generating sites. It is headquartered in Northampton, United Kingdom with an additional office in Oxford.

Regal Petroleum

Regal Petroleum plc is a petroleum company based in London with assets in Romania, Ukraine, Greece, and Egypt. It was founded by Frank Timiş in November 1996, and is listed on the London Alternative Investment Market.

Score Group plc

Score Group plc is an international engineering business based in Peterhead, Scotland.

Sunbury Research Centre

The Sunbury Research Centre -- also known as ICBT Sunbury -- is a main research institute of BP in north-east Surrey.

UK Power Networks

UK Power Networks is a distribution network operator for electricity covering South East England, the East of England and London. It manages three licensed distribution networks (Eastern Power Networks PLC, South Eastern Power Networks PLC and London Power Networks PLC) which together cover an area of 30000 square kilometres and approximately eight million customers.

In 2014 UK Power Networks was awarded £25 million from the electricity regulator Ofgem's Low Carbon Networks Fund for the Low Carbon London project. In 2011 it was awarded £6.7 million by Ofgem for another project, Flexible Plug and Play, which is researching new ways, technical and commercial, to connect renewable energy to the distribution network in Cambridgeshire.

As well as the three distribution arms UK Power Networks also operates UK Power Networks Services Holdings Limited, which develops and maintains electrical networks for clients including London Underground, Heathrow and Stansted airports, Docklands Light Railway and Canary Wharf.


WesternGeco is a geophysical services company. It is headquartered in the Schlumberger House on the property of London Gatwick Airport in Crawley, West Sussex, in Greater London.

Western Power Distribution

Western Power Distribution is the trading identity of four electricity distribution companies - WPD South West (operating in South West England), WPD South Wales (operating in South Wales) and WPD Midlands (operating in East Midlands and West Midlands). All of the companies act as the distribution network operator for their respective regions, and are registered in Bristol, England. Western Power Distribution serves approximately 7.7 million customers over its combined distribution areas.

Western Power Distribution is a subsidiary of the American utility corporation PPL.

It should not be confused with WPD, a wind farm company in north-western Europe, or Western Power Corporation, an electricity distributor in Australia.

This page is based on a Wikipedia article written by authors (here).
Text is available under the CC BY-SA 3.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.