Polling by the More in Common think-tank, seen by HuffPost UK, shows that nearly two-thirds of the public - 63% - back the party’s flagship “Great British Energy” policy.
Labour has said the new publicly-owned body will reduce bills and boost energy security by making the UK less reliant on foreign imports.
However, the poll of 2,055 British adults shows that the 67% believe it will either increase or have no effect on how much they pay for their gas and electricity, with just 33% thinking it will bring them down.
Meanwhile, nearly half (45%) think it will lead to higher taxes, compared to 40% who think it will have no effect and 15% who think it will reduce them.
Luke Tryl, executive director of More in Common, said: “What’s interesting about support for Labour’s flagship GB Energy policy is that it’s not just Labour voters who like it - those voting for other parties also say it’s a good idea."