The Government said it was acting to prevent any possible "looming energy gap" following the Ofgem boss' warning.
A Department of Energy and Climate Change spokesman said:
Our energy system faces significant challenges over coming years, including the closure of around one-fifth of our ageing power stations, so, as Ofgem highlights, we cannot afford to be complacent and may face a looming energy gap.
The reforms we are making to the electricity market through the Energy Bill and through our gas generation strategy are aimed at plugging this gap in order to keep the lights on.
We can't put all our eggs in one basket, we need a diverse energy mix.
This is the best solution to guard against high price of wholesale gas which drives up consumer bills.
Our increasing reliance on gas leaves the UK more reliant on an energy supply from a very dangerous part of the world.
So what is behind the new urgency in the warnings about keeping the lights on?
The boss of energy regulator Ofgem has warned that the looming shutdown of several coal power plants will raise energy bills further.