RWE npower plans to build a ВЈ1bn combined cycle gas turbine power station in Pembroke, West Wales.
Meanwhile Powerfuel Power plans to construct an integrated coal gasification gas-fired power station in Hatfield, South Yorkshire.
And Centrica Leasing hopes to construct a combined cycle gas turbine power station in King's Lynn, Norfolk.
"Investment like this in the energy sector will create new engineering and construction jobs," said Energy and Climate Change minister, Mike O'Brien.
Fox to proceed with TV switch, leaving 30K Middle Tennesseans behind
CBI construction chiefs back council house building plan