In a policy review document published in advance, the party set out a three-point plan to keep down energy bills.
A Labour government would replace Ofgem with a more powerful watchdog, require energy companies to pool the power they generated and put over-75s on their cheapest tariff, it said.
Shadow energy secretary Caroline Flint MP said: “The time has come for a complete overhaul of our energy market, and Labour is the party with the ideas and strength to meet the massive challenges facing the country.”
The party characterised the coalition government as out of touch and accused it of putting the interests of big energy companies ahead of customers.
“Families struggling with soaring energy bills and facing more price rises this winter deserve better than this shambolic government and clueless prime minister,” continued Flint.
“We need a One Nation government to break the dominance of the energy giants, protect vulnerable customers from being ripped off and create a tough new energy regulator with the power to force energy companies to pass on savings to consumers.”