Ofgem approves £28bn five-year plan for UK electricity and gas networks. Investment adds £108 to typical bills by 2031 with £60 electricity and £48 gas. Savings of £80 from reduced gas imports and cheaper wholesale energy offset most costs. Net bill rise £30 yearly after savings. Funding maintains gas pipes and strengthens electricity transmission. Electricity investment £10.3bn replaces ageing infrastructure and adds transmission lines. Gas investment £17.8bn covers cyber security and pipe replacement. Grid upgrades cut inefficiencies like paying offshore windfarms to shut down. Bills increase gradually 2-3% from April next year. Government pledges cuts elsewhere saving £150 yearly. Energy firms separate from suppliers with cost controls. Investment ensures safe secure resilient networks. UK shifts from gas dependence for energy security. Critics demand scrutiny to protect bill payers.