There is not that much that is mothballed. Fawley was originally 2GW but 1GW of that hasn't run for the best part of a decade. The whole place is permanently closing in a few months. Grain has 1.3GW mothballed with 1.3GW available until end of 2015 , Littlebrook 1GW mothballed, 1GW available until 2015, Kingsnorth has nearly run out of hours under LCPD. That covers the English oil generation. Scotland has Peterhead but there are severe constraints on export across into England.
As ar as coal is concerned Ironbridge at 1GW is running out of hours under the LCPD and Didcot A 2GW is going at the end of March 2013.
Some like Wylfa (the last of the Magnox's) 0.5GW are shutting much sooner than that, almost certainly this coming year. Others will go before 2019 (Heysham 2
1.2GW, Hartlepool 1.2GW, Hinkley Point B 0.9GW) Dungeness B 1GW probably about the same time, Hunterston B 1GW is now 2023 as is Torness 1.3GW. Sizewell B 1.2GW is currently 2035So that leaves just 3.5GW of nukes post 2019, and 1.2GW post 2023. A f*cking disgrace.
Recession and sky high prices will drive demand down. The folly of privatisation and the dash for gas is coming to bite the UK and destroy its economy.