Ed Miliband argues the UK should race towards becoming a ‘clean energy superpower’, but costs to the consumer shouldn’t be ignored

The government’s plan to decarbonise the UK’s electricity system by 2030 is a vast undertaking. Energy companies will throw £40bn-plus annually at the effort, backed by financing that ultimately affects consumers’ bills. So it is extraordinary that no official body seems able to answer this question: will it cost more to complete the job by 2030 rather than by the old 2035 timetable? Is it more expensive to go faster?

That is not to dispute the necessity of generating electricity from clean domestic sources, an ambition shared widely across the political spectrum for reasons of security of supply and climate emergency. But the pace of decarbonisation can clearly also affect the cost for consumers, a point Ed Miliband, the energy secretary, tends to skip over too breezily when he argues that security, sustainability and affordability are now perfectly aligned.