The union boss added: “This Government needs to face the scale of the problem, and right now it isn’t even close,” she said.
Simon Francis, coordinator of the End Fuel Poverty Coalition, said that the £100 energy payment “would barely dent” the rising costs.
Mr Francis also warned that, because it will be paid into bank accounts, it might not even be used for heating.
He said: “The Chancellor talked the talk on energy bills, but ultimately failed to walk the walk.
“The Government acknowledged that wholesale gas prices have tripled since February and that, because of this, bills are expected to rise further during the sixth winter of high energy costs.
“We needed a Budget that set out substantial immediate help and a long-term plan to get Britain off gas and heating oil for good, but instead we got more piecemeal support and vague future promises.”