The link represent DECC’s initial thinking. It is subject to change and may or may not be published.
They give for example the following costs, all in UK Pounds/kWe:
CCGT – 600 – 690
Coal 1250 – 1500
Onshore wind – 1074
Offshore wind – 1429
The table on the link gives a lot more detail.
Surprisingly, perhaps (or perhaps not given the historical bias), there is no mention of the capital costs, or the running costs of the cheapest means of cutting CO2 and fuel costs – Combined Heat and Power with District Heating CHPDH for cities, and micro-CHP for suburbs.
If you have any evidence to suggest that any of the assumptions differ from what is attached in the spreadsheet, you may wish to contact Stephen Green, Senior Economist, Energy Strategy, Security and Markets Directorate Department of Energy and Climate Change, at DECC.