The energy regulator has confirmed plans for a massive upgrade to the UK's energy grids, adding £108 to customer bills by 2031.

Ofgem said on Thursday that the £28bn investment over the next five years would bolster resilience in the transition to a renewable energy future and that much of the bill would be offset by increased efficiency.

It pointed to estimated savings for households of around £80 because of the planned investment in gas and power infrastructure, leaving a net additional contribution of £28.

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Ofgem said the £28bn sum formed part of an estimated £90bn to be invested in the energy networks by 2031, with "adaptive" funding arrangements helping to shie

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