Recommendation 5

The Government has set a target to decarbonise the power system by 2035, subject to security of supply. The Government has not defined ‘security of supply’. After 2035, there may be rare occasions when the UK needs to use unabated gas-fired stations to meet shortfalls in supply. A clear definition of ‘security of supply’ is needed to ensure that the Government can be properly held to account for its performance against the 100 Decarbonisation of the power sector 2035 target. The Government should define the ‘subject to security of supply’ condition in its 2035 target and clarify the amount of residual emissions from unabated gas plants that it is willing to accept from 2035 onwards.