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UK National Electric Power System

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UK National Electric Power System

Table of Contents

  1. Introduction
  2. UK Electrical Power Supply and Consumption
  3. UK Generation Costs
  4. Power Stations
  5. Power Distribution
  6. Power Users
  7. Home Electrics
  8. Tables showing Power Stations in UK


The notes below relate to the supply and electrical power transmission system in the UK.     The notes are outline in nature and are intended to provide a general background sufficient for a mechanical engineer to have an awareness of the electrical power supply system as used in the UK

The high-voltage electric power transmission is called the National Grid and transfers the power which is generated in the power stations: [coal , gas, nuclear, hydroelectric, etc ] to local substations which supply power at lower voltages to the various users :[commercial, industrial, domestic ] in the United Kingdom. There are also High- Voltage-Direct-current undersea supply lines form/to northern France (HVDC Cross-Channel)and Northern Ireland (HVDC Moyle).

The power transferred in an electrical transmission line directly related to the (voltage2 / resistance ) = E2/R     The power loss in a conductor is the Current2 x Resistance = I2.R.    Therefore for maximum efficiency of power transmission the electrical power should be transferred at the highest voltage and the lowest current.

In the United Kingdom a range of specific voltages have been adopted to cover adequately various levels of power transmission.

Power stations generators produce electricity at 25kV and 33KV.    The generator output voltages are stepped up, using transformers, for efficient transmission through the National Grid cables, to voltages of 400kV, 275kV and 132kV.

The parts of the system carrying electrical supplies at voltages in excess of 200kV are called the Super grid.

There is also a High-Voltage-Direct-current undersea supply lines form/to northern France (HVDC Cross-Channel).    The undersea section consists of eight 29 mile long 270 kV submarine cables, between Folkstone (UK) and Sangatte (France).    The UK power transmission systems also includes other lower duty HVDC links.

The local transmission voltages to industrial commercial and domestic users include 11 kV, 33 kV, 66 kV.

UK Electrical Power Supply and consumption

At the present time the available UK power generation capacity is about 78GW not including a large number of minor generation facilities e.g. small hydroelectric generators, solar panels , factory based diesal generators etc. (Tables showing the capacity are provided at the foot of this webpage).     This capacity is used to meet the ongoing national demand.    This demand, normally, varies on a continuous basis over a 24 hour cycle between a maximum of about 42 GW and a minimum of about 22 GW. (See chart below).

However there significant variations on this pattern with peaks of up the 54GW at times when a large percentage of the population carry out a loading event at the same time and in times of adverse weather.    The generation capacity is also not constant e.g. power stations shut down due to plant failure or maintenance : windpower farms lose their generation capacity when there is no wind.    There are also significant power losses due in the transmission of the power from the generators to the suppliers.     The control of the supply network is therefore critical and it is often necessary to import power from France via the HVDC link

Cost of Power Genration in UK

The selection of the electic supplies to the national grid is organised on a basis of availability and cost.    The cost of power generation is extremely difficult to estimate as there are a large number of variables including , fuel cost, capital cost, operating cost, decommssioning costs, costs of generation back-up etc etc. An estimate of the current prices are required to allow the grid controllers to select which suppliers provide the current loading.     It is also necessary to have an estimate of the lifetime costs of future generation to allow investment in new power stations.   Below are tables showing estimated costs for existing facilities and for new facilities.

Important Note: these are indicative and are only useful for comparing costs in the same table.    the two tables are based on information from different sources produced at different dates. The souces also use very different accountancy methods.    Please refer to the linked reports for quality information.   

Indicative Base line operation with no CO2 removal costs included (2004 values)

Important Note: The report from which these costs has been extracted was issued in 2004.    The fuel costs have risen dramatically since that time i.e coal costs have increased by about 300% and gas costs have increased by at least 200%.    The table should therefore only be used as a guide to indicative relative costs , as noted above.

Technology Operating Cost
Coal -fired PF 2,5
Coal fired CFBC 2,6
Coal Fired IGCC 3,2
Gas Fired OCGT 3,1
Gas Fired CCGT 2,2
Nuclear 2,3
Onshore Wind + Back-up 5,4
Offshore Wind + Back-up 7,2

Note: If gas OCGT is operated on a peaking cycle the costs rise to 6,2 pence/kVh

The Cost of Generating Electricity Royal Academy of engineering

PF=pulverised coal.
CFBC=Circulating fluidised bed combustion
CCS=Carbon capture and storage;
FGD=flue gas desulphurisation;
IGCC=integrated gasification combined cycle;
OCGT=open cycle gas turbine;
CCGT=combined cycle gas turbine;

Indicative - Generation costs for New plant (2010).

Technology Operating Cost
Coal with CO2 capture 10-15,5
Natural gas turbines with CO2 capture 6-13
Natural gas turbine, no CO2 capture 5,5-11
New nuclear 8-10,5
Onshore wind 8-11
Solar farms 12,5-18
Offshore wind 15-21
Tidal power 15,5-39
Biomass 6-12

UK Electricity Generation Costs Update Mott Macdonald Report

There is little information available for Hydro-Electric generation costs.    I believe that the costs/KWh is comparable to conventional to coal/gas. However there is very little scope for developing new facilities in the UK and the existing larger faciliities are primarily pumped storage systems which are used to allow, low cost, continuous base load operations on other power generation types.

Electrical Power Suppliers

Most of the electrical power supplied to the National Grid is from turbine driven generators located at Coal, Nuclear , Gas, or Oil powered stations.

There is also considerable renewable energy capacity in place in the UK including bio-mass power generation, hydro-electric generation and a considerable number of wind power farms.

The larger power stations have a number of turbines generating voltages about 33kV .     Each generator supplies to the grid via switches and step up transformers.    The switches would typically consist of three oil filled cylindrical tanks, one for each phase, each with two insulators on the top to carry the input and output lines.    At one end would be a box containing the gear to operate the mechanical switches inside the oil-filled tanks.    The Transformers are generally oil cooled and step up the voltage to 275kV or 400kV.    The oil cooling system may include a recirculating system with the oil transferred through large radiator units.
The generators output could also be used at lower voltages to power electrical equipment at the power stations.

Different types of power stations have different performance criteria.    Nuclear power stations need to be operated continuously providing a base load.    Coal powered stations also are most efficient when operated fairly continuously. Gas powered power stations can be reasonably quickly started and shut down.    Diesel Generators have limited capacity but are able to be started and stopped very quickly.    Diesel generators are the primary sources of power for small companies either as back up to the grid or in many cases as the primary source of power to drive large machines.   The wind power generators supply energy continuously when the wind force and direction are favorable.    Hydro electric storage generators are very useful for balancing the supply with the demand.

There are a number of Hydro-electric power stations, the majority of which, are located on the scottish lochs.     The larger ones (over 1 MW) are listed in the table at the foot of this webpage

The largest hydro-electric power station( Dinorwig) is located in Wales, has a generation capacity of 1.7GW.    This is a pumped water storage power station operated as a short-term-operating-reserve, or fast response plant which is brought on line in response to short term rapid changes in power demand or sudden loss of power stations.    This station pumps water into a high level reservoir.    The power to do this is derived from the grid during periods of low national demand. When there is a sudden increased demand the water is allowed to flow back to a lower level reservoir generating power for the grid.

The UK national Electricity supply industry also includes a large number of wind powered generators grouped in farms in windy areas on land and offshore in the seas around the UK coast.

Individual wind turbines are interconnected with a medium voltage (usually 34.5 kV) power collection system and communications network.    At a substation, this medium-voltage electrical current is increased in voltage with a transformer for connection to the local high voltage transmission system.    Construction of a wind farm requires installation of the collector system and substation.    Wind farms are generally located near rural areas of comparative low local power loading.    Voltage / power fluctuations resulting from wind speed/direction variation and start-up and shut downs can be significant problems to the local power supplies in these regions.

As the present time (May 2011), there are about 292 operational wind farms in the UK, with 3 184 turbines and 5,3GW of installed capacity.     A further 3,9GW worth of schemes are currently under construction, and about 5.4 GW have planning consent and some 8.7GW are in the process of planning awaiting approval.    There is a growing utilisation of renewable resources in the UK but these are not do not provide continuous reliable availability and there will be a continuing requirement for a combination of coal, gas and nuclear capacity.

There is an on-going argument as to the level of power back-up that is required for wind power generated supplies.    The pessimistic view is that 80%-90% back-up is required.

Electrical Distribution system in UK

Most of the electrical power is transferred from the generators to the users via cables suspended from large engineered pylons.    These are aesthetically not pleasing but they are far cheaper than the alternative of underground cables which have to be provided with highly engineered insulation to cater for the high voltages and the arduous conditions underground.    The suspended high voltage cables are generally based on steel cores surrounded with a layer of conducting aluminium .    The cables are generally supported from the arms of the pylons with engineered insulators.    The diagram below shows the main principles of the UK National grid system.

National Grid System.. Detailed download map showing UK Electrical Distribution System as of 2004

Users of electrical Power ..

Virtually all public electricity supplies are AC today.

Users of large amounts of DC power including electric railways, telephone exchanges and industrial processes such as aluminium smelting usually either have adjacent dedicated generating equipment, or use rectifiers to derive DC from the public AC supply.

The electrical supplies to industrial users are invariably three phase.    Three-phase supplies are essential for operating heavy industrial equipment.     A ground is normally provided, connected to conductive enclosure and other safety equipment, to keep current away from equipment and people.    The delivered voltage is supplied via step- down transformers

The standards 3 phase supply in the UK is 400 V -6% to +10% (376V and 440 V) .    For many years the 3 Phase supply has been a nominal 415V supply.    In many areas, "delta" three phase service is common.    Delta service has no distributed neutral wire and is therefore less expensive.     Ground is provided as a low resistance earth ground, sometimes attached to a synthetic ground made by a transformer in a substation.

The standard nominal supply voltage in domestic single-phase 50 Hz installations in the UK is still 240V AC (RMS).     However, to conform with European codes, the official voltage is 230 V+10%-6% (216.2-253 V).    There is a proposal to modify this to 230 V -10% (207-253 V).    .

Home Electric Systems ..

The electrical supply to a typical UK house is via an electricity board on which is mounted the meter which records the quantity of electricity used and a consumer unit which includes a power main switch and fuses or circuit breakers for the various circuits feeding the sockets and devices located around the home.

There are five different circuit types used in the typical domestic system

1) Ring circuit. This circuit starts from a (32 Amp) fuse/Circuit breaker and is routed round a chain of sockets and returns to the supply point. Ring Circuit

2) Single appliance circuit...Routed directly to an appliance which is a large consumer of electricity such as a cooker or shower. This is normally provided with a max. 30 amp fuse/breaker in the consumer unit. Single Appliance

3) A lighting circuit. There is normally one lighting circuit for a maximum of 10 lights . A lighting circuit is often provided for all the lights on each floor of a house. A lighting circuit is normally provided with a 5 amp fuse/breaker. Lighting

4) The socket off a ring is generally a single or twin unit design to take a standard 3 pin plug.    The plug has to be fitted with a 13amp or 3 amp fuse.

5) It is sometimes convenient to run a spur circuit off a socket to a single of double socket or a (max 13 amp)fused connected appliance.

Important: The above notes on a domestic system are only general in nature . Detailed requirements are found in the relevant regulations. (BS 7671: 2008, 17th Edition).;

Tables showing Power stations in UK

Total of UK generation Capacity in UK = 78GW (2009), maximum simultansous UK load 60 GW (2009)..Governemnt statistics (2010) ref Department of Energy and Climate Change- Statistical Press Release 29/Jul/2010

These lists and totals do not include tidal power generators, and power stations /generators with capacities less than 1 MW.
The lists are based on information available on the internet on 25/05/2011.   Stations are closing down and new power stations / wind farms are being constructed over time and so these lists represent a rough snapshot of the situation at a set time.

Coal..... Nuclear..... Gas..... Oil..... Hydroelectric..... Windpower - Offshore..... Windpower - Onshore..... Biomass.....

Coal Power Stations
Name Power(MW) Location
Cottam Power Station 2008 England
Didcot A Power Station 1958 England
Drax power station 3870 England
Eggborough Power Station 1950 England
Ferrybridge Power Station 1995 England
Fiddlers Ferry Power Station 1961 England
Ironbridge Power Station 970 England
Kingsnorth power station 1940 England
Lynemouth Power Station 420 England
Ratcliffe-on-Soar Power Station 2000 England
Rugeley Power Station 1006 England
Tilbury Power Station 1038 England
West Burton Power Station 1972 England
Wilton Power Station 197 England
Cockenzie (Scot) 1200 Scotland
Longannet 2400 Scotland
Kilroot 520 N.Ireland

Note: Kilroot is a coal ,Oil and Bio-mass combined station.

Nuclear Power Stations
Name Power(MW) Location
Dungeness B 1080 England
Harlepool Power Station 1210 England
Heysham -stage 1 1200 England
Heysham stage 2 1200 England
Hinkley Point B 1260 England
Oldbury Power Staion. 470 England
Sizewell B 1190 England
Hunterston B 1288 Scotland
Torness 1364 Scotland
Wylfa 490 Wales

Gas Power Stations
Name Power(MW) Location
Barking Reach power station 1000 England
Blackburn Mill 60 England
Bridgewater power station 10 England
Burghfield power station. 45 England
Chickerell power station. 45 England
Chippenham power station. 10 England
Corby Power Station. 401 England
Coryton Power Station. 732 England
Cottam Power Station. 400 England
Damhead Creek power station. 792 England
Derwent Power Station. 214 England
Didcot B Power Station. 1390 England
Enfield Power Station. 92 England
Fellside Power Station. 80 England
Glanford Brigg Power Station . 68 England
Great Yarmouth Power Station. 20 England
Immingham Power Station. 730 England
Keadby Power Station. 45 England
Killingholme Power Station.(Centrica) 665 England
Killingholme Power Station.(EON) 900 England
Kings Lynn Power Station. 40 England
Little Barford Power Station. 65 England
Langage Power Station. 900 England
Marchwood Power Station . 40 England
Medway Power Station. 88 England
Peterborough Power Station. 05 England
Rocksavage Power Station. 748 England
Roosecote Power Station. 29 England
Rye House Power Station. 715 England
Salt End power station. 1200 England
Seabank Power Station. 145 England
Seal Sands Power Station. 50 England
Sevington power station. 10 England
Shoreham Power Station. 400 England
Solutia power station. 10 England
South Humber Bank Power Station. 1285 England
Spalding Power Station. 860 England
Staythorpe Power Station. 1650 England
Sutton Bridge Power Station . 800 England
Taylors Lane Power Station. 132 England
Teesside power station. 1875 England
Weston Point CHP - England
Wheldale power station. 8 England
Winnington Power Station. 130 England
(designed for oil)
1550 (running on gas) Scotland.

Oil Power Stations
Name Power(MW) Location
Fawley Power Station 968 England
Grain Power Station 1300 England
Littlebrook D Power Station 2055 England

Hydro Electric Power Stations
Name Power(MW) Location Type
Achanalt 3 Scotland Conventional
Aigas 20 Scotland Conventional
Allt-na-Lairige 6 Scotland Conventional
Bonnington 11 Scotland Conventional
Carsfad 12 Scotland Conventional
Cashlie 11 Scotland Conventional
Cassley 10 Scotland Conventional
Ceannacroc 20 Scotland Conventional
Chliostair 1 Scotland Conventional
Clachan 40 Scotland Conventional
Clunie 61 Scotland Conventional
Cuaich 2.5 Scotland Conventional
Cuileig 3.2 Scotland Conventional
Culligran 19 Scotland Conventional
Dalchonzie 4 Scotland Conventional
Deanie 38 Scotland Conventional
Drumjohn 2 Scotland Conventional
Earlstoun 14 Scotland Conventional
Errochty 75 Scotland Conventional
Fasnakyle 69 Scotland Conventional
Finlarig 16.5 Scotland Conventional
Foyers 305 Scotland Conventional
Foyers Falls 5 Scotland Conventional
Gaur 7.5 Scotland Conventional
Gisla 1 Scotland Conventional
Glenlee 24 Scotland Conventional
Glenmoriston 37 Scotland Conventional
Grudie Bridge 18.7 Scotland Conventional
Inverawe 25 Scotland Conventional
Invergarry 20 Scotland Conventional
Kendoon 24 Scotland Conventional
Kerry Falls 1 Scotland Conventional
Kilmelfort 2 Scotland Conventional
Kilmorack 20 Scotland Conventional
Kingairloch 3.5 Scotland Conventional
Kinlochleven 30 Scotland Conventional
Lairg 3.5 Scotland Conventional
Lednock 3 Scotland Conventional
Livishie 15 Scotland Conventional
Loch Dubh 1.2 Scotland Conventional
Loch Ericht 2.2 Scotland Conventional
Loch Gair 6 Scotland Conventional
Lochaber 88 Scotland Conventional
Lochay 45 Scotland Conventional
Lubreoch 4 Scotland Conventional
Luichart 34 Scotland Conventional
Lussa 2.4 Scotland Conventional
Morar 1 Scotland Conventional
Mossford 18,7 Scotland Conventional
Mullardoch 2.4 Scotland Conventional
Nant 15 Scotland Conventional
Nostie Bridge 1 Scotland Conventional
Orrin 18 Scotland Conventional
Pitlochry 15 Scotland Conventional
Quoich 18 Scotland Conventional
Rannoch 44 Scotland Conventional
Shin 18.6 Scotland Conventional
Sloy 160 Scotland Conventional
Sron Mor 5 Scotland Conventional
St Fillans 16.8 Scotland Conventional
Stonebyres 5 Scotland Conventional
Storr Lochs 2.4 Scotland Conventional
Striven 8 Scotland Conventional
Tongland 33 Scotland Conventional
Torr Achilty 15 Scotland Conventional
Trinafour 0.5 Scotland Conventional
Tummel Bridge 34 Scotland Conventional
Cruachan Dam 400 Scotland Pumped Storage
Foyers 300 Scotland Pumped Stroage
Beeston 1,7 England River
Kielder Water 12 England Conventional
Dinorwig 1728 Wales Pumped Storage
Dolgarrog 18 Wales Pumped Storage
Ffestiniog 360 Wales Conventional
Rheidol 49 Wales Conventional
Cwm Dyli 10 Wales Conventional
Maentwrog 30 Wales Conventional
Glendoe 100 Scotland Conventional

Offshore Wind Farms
Name Capacity
Barrow 90 England
Beatrice 10 Scotland
Blyth Offshore 4 England
Burbo Bank 90 England
Gunfleet Sands 1 108 England
Gunfleet Sands 2 64.8 England
Kentish Flats 90 England
Lynn & Inner Dowsing 194.4 England
North Hoyle 60 Wales
Rhyl Flats 90 Wales
Robin Rigg 180 Scotland
Scroby Sands 60 England
Thanet Offshore 300 England
Totals 1,3GW 

Onshore Wind Farms
Name Capacity
Milton Keynes 14 England
Coldham 16 England
Glass Moor 16 England
McCains Foods 9 England
Ransonmoor Farm 6 England
Ransonmoor Farm Phase II 4 England
Red Tile 24 England
Stags Holt 18 England
Bears Down 9.6 England
Carland Cross 6 England
Cold Northcott 6.8 England
Delabole wind farm[1] 4 England
Four Burrows 4.5 England
Goonhilly Repowering 12 England
St Breock 4.95 England
WWF Roskrow Barton 1.7 England
Broom Hill (includes Sunnyside) 8 England
Hare Hill(3Hs) 5.5 England
High Hedley Hope 2.25 England
High Hedley Hope 2 5.2 England
High Volts (3Hs) 8.25 England
Holmside Hall (3Hs) 5.5 England
Langley Park/Long Edge 8 England
Tow Law 2.31 England
Trimdon Grange 5.2 England
Walkway, High Swainston 14 England
West Durham 24 England
WWA High Sharpley 2.6 England
Askam 4.62 England
Eastman (Voridian) 4 England
Great Orton II 3.96 England
Harlock Hill 2.5 England
Haverigg II 2.4 England
Haverigg III 3.4 England
Kirkby Moor 4.8 England
Lambrigg 6.5 England
Lowca 4.62 England
Oldside 5.4 England
Siddick 4.2 England
Wharrels Hill 10.4 England
Winscales Moor 5.95 England
Winscales 1.98 England
Winscales Extension 6.8 England
WWU High Pow 3.9 England
Forestmoor 2.7 England
Lissett Airfield 30 England
Bristol Port Wind Park Ltd 6 England
Out Newton 9.1 England
Little Cheyne Court 59.8 England
Caton Moor Repowering 16 England
Coal Clough 9.6 England
Scout Moor 65 England
WWP Hameldon Hill 4.5 England
Bagmoor 16 England
Bambers Farm 4.8 England
Bambers Farm II 4.8 England
Bicker Fen 26 England
Conisholme Fen Resubmission 16 England
Deeping St Nicholas 16 England
Gedney Marsh (Red House) 12 England
Mablethorpe 1.2 England
The Hollies Wind Farm 2.6 England
Dagenham 3.6 England
Mersey Docks 10 England
Royal Seaforth Dock 3.6 England
Blood Hill 2.25 England
North Pickenham Wind Farm 14.4 England
Knabs Ridge, Felliscliffe 16 England
Rusholme 24 England
Burton Wold 20 England
Blyth Harbour 2.7 England
Kirkheaton 1.8 England
Lindhurst Wind Farm 9 England
Westmill 6.5 England
Loscar 4.5 England
Royd Moor 6.5 England
Great Eppleton Repowering 8.2 England
Nissan Motors Plant 3.96 England
Chelker Reservoir 1.2 England
Ovenden Moor 9.2 England
Loftsome Bridge Water Treatment Works 2.6 England
Garves Mountain/Dunloy 15 N.Ireland
Corkey 5 N.Ireland
Elliots Hill 5 N.Ireland
Gruig 25 N.Ireland
Wolf Bog 10 N.Ireland
Callagheen 16.9 N.Ireland
Slieve Rushen Repowering 54 N.Ireland
Tappaghan Mountain 19.5 N.Ireland
Tappaghan Mountain Extension 9 N.Ireland
Altahullion Phase I 26 N.Ireland
Altahullion Phase II 11.7 N.Ireland
Rigged Hill 5 N.Ireland
Bessy Bell 5 N.Ireland
Bessy Bell Extension 9 N.Ireland
Bin Mountain 9 N.Ireland
Hunter's Hill 20 N.Ireland
Lendrums Bridge Phase I 5.94 N.Ireland
Lendrums Bridge Phase II 7.3 N.Ireland
Lough Hill Resubmission 7.8 N.Ireland
Owenreagh 5 N.Ireland
Owenreagh Extension 5.1 N.Ireland
Slieve Divena 1 30 N.Ireland
Boyndie Airfield 14 Scotland
Boyndie Airfield Extension 2.3 Scotland
Cairnmore 2.55 Scotland
Dummuie 10.4 Scotland
Glens of Foudland 26 Scotland
Hill of Balquhindachy (Extension) 1.7 Scotland
Hill of Eastertown 2.55 Scotland
Hill of Fiddes 6.9 Scotland
Hill of Skelmonae 3.2 Scotland
House O Hill 2.4 Scotland
North Redbog 1.6 Scotland
St John's Wells 2.4 Scotland
Strath of Brydock 4.6 Scotland
Tullo 17.5 Scotland
Upper Ardgrain 2.4 Scotland
Ardkinglas/ Clachan Flats 15.03 Scotland
Beinn an Tuirc 30 Scotland
Beinn Ghlas 8.4 Scotland
Cruach Mhor 29.75 Scotland
Deucheran Hill 15.75 Scotland
Tangy 18.65 Scotland
Artfield Fell 19.5 Scotland
Craig Wind Farm 10 Scotland
Dalswinton, Pennyland Moor 30 Scotland
Minsca 36.8 Scotland
North Rhins 22 Scotland
Wether Hill 18.2 Scotland
Windy Standard 21.6 Scotland
Michelin Tyre Factory 4 Scotland
Hare Hill 13.2 Scotland
Aikengall 48 Scotland
Myres Hill 1.9 Scotland
Whitelee[2], Eaglesham Moor 322 Scotland
Achairn Farm, Stirkoke 6.15 Scotland
Achany Estate 38 Scotland
Beinn Tharsuinn 29.75 Scotland
Beinn Tharsuinn Extension 4.6 Scotland
Ben Aketil 23 Scotland
Ben Aketil Extension 4.6 Scotland
Bilbster (Watten) 3.9 Scotland
Boulfruich 13 Scotland
Causeymire 48.3 Scotland
Edinbane 41.4 Scotland
Fairburn Estate 40 Scotland
Farr Wind Farm 92 Scotland
Forss Extension 5.2 Scotland
Forss, Hill of Lybster 2 Scotland
Gigha Community 0.68 Scotland
Kilbraur (Strathbrora) 47.5 Scotland
Millennium (Glenmoriston) 40 Scotland
Millennium Extension (Glenmoriston) 10 Scotland
Novar 17 Scotland
Findhorn Foundation 0.75 Scotland
Findhorn Foundation Extension 0.75 Scotland
Pauls Hill 64.4 Scotland
Rothes (Cairn Uish) 50.6 Scotland
Ardrossan 24 Scotland
Ardrossan Extension 6 Scotland
Wardlaw Wood (Dalry Community Windfarm) 18 Scotland
Hagshaw Hill Extension 26 Scotland
Bu Farm 2.7 Scotland
Burgar Hill 5 Scotland
Hammars Hill 4.5 Scotland
Spurness Wind Farm 8.25 Scotland
Drumderg 36.8 Scotland
Green Knowes 27 Scotland
Toddleburn 27.6 Scotland
Black Hill 28.6 Scotland
Bowbeat 31.2 Scotland
Carcant 6 Scotland
Crystal Rig 50 Scotland
Crystal Rig1a 12.5 Scotland
Crystal Rig2 & 2a 138 Scotland
Dun Law 17.6 Scotland
Dun Law Extension 29.75 Scotland
Long Park 38 Scotland
Burradale Phase 1 1.98 Scotland
Burradale Phase 2 1.7 Scotland
Hadyard Hill, Barr 120 Scotland
Black Law Phase I 97 Scotland
Black Law Phase II 27.6 Scotland
Greendykeside Wind Farm 4 Scotland
Hagshaw Hill 15.6 Scotland
Lochhead Farm 6.15 Scotland
Braes of Doune 72 Scotland
Burnfoot Hill 26 Scotland
Craigengelt 20 Scotland
Earlsburn 37.5 Scotland
Pates Hill 14 Scotland
Arnish Moor 3.9 Scotland
Llyn Alaw 20.4 Wales
Alltwalis (formerly Blaengwen) 23 Wales
Blaen Bowi 3.9 Wales
Parc Cynog 3.6 Wales
Pendine (Parc Cynog Extension I) 7.8 Wales
Cefn Croes 58.5 Wales
Dyffryn Brodyn 5.5 Wales
Llangwyryfon 9.35 Wales
Mynydd Gorddu 10.2 Wales
Rheidol 2.4 Wales
Rhyd-y-Groes 7.2 Wales
Moel Maelogen 2.6 Wales
Moel Maelogen Extension 11.7 Wales
Tir Mostyn & Foel Goch 21.25 Wales
Wern Ddu (Craig Lelo) 9.2 Wales
Braich Ddu Farm 3.9 Wales
Hafoty Ucha 2 Extension 1.7 Wales
Trysglwyn 5.6 Wales
Ffynnon Oer 32 Wales
Castle Pill Farm Repowering 3.2 Wales
Solutia UK Ltd 5 Wales
Bryn Titli 9.9 Wales
Carno A& B 33.6 Wales
Carno Extension 15.6 Wales
Cemmaes 15.3 Wales
Llandinam P&L 30.9 Wales
Mynydd Clogau 14.45 Wales
Taff Ely 9 Wales
Total for whole UK 3,7GW  

Biomass Power Stations
Name Capacity
Ely power station 38 Straw/Gas England
Eye power station 13 Animal waste England
Eye Power Station 12,7 Poultry Litter England
Glanford Power Station 13 meat/Bone England
Thetford power station 39 Poultry Litter England
Wilton 10,3   England
Westfield 9,8   Scot
Stevens Croft 40 Wood Scot
Longlands Lane 10 Wood Wales
Total for whole UK 0,19 GW   

Useful relevant Links
  1. Wikipedia National Grid... Probably the best source of information on the National Grid .
  2. National Grid seven year statement... Great amount of very detailed information
  3. The electricians guide... Notes relating to the UK electical Regs.