Britain’s energy watchdog has given the green light to an initial £28 billion of investment to upgrade UK energy infrastructure, but revealed the move will push up network charges on household bills by £108.

In its final verdict on price controls for energy network firms over the next five years, Ofgem has increased the allowed investment spend from the initial £24 billion that was provisionally given the go ahead in the summer.

It said the higher investment level will see £17.8 billion spent on gas transmission and distribution networks in the five years to 2031, with a further £10.3 billion used to strengthen the UK’s high-voltage electricity network.

But Ofgem said its decision to increase the allowed investment spend will push up household bills by more than first expected, before s

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