By Eliot Wilson GB Energy makes for good rhetoric, but £8.3bn for this public project means it has a lot to prove, writes Eliot Wilson He may have failed to become prime minister all those years ago in 2015, but Ed Miliband is a satisfyingly busy man. The Secretary of State for Energy Security and Net Zero last month unveiled the Great British Energy Bill, a short piece of legislation, a slender eight clauses, which will establish a publicly owned company called Great British Energy. This body will have four objectives: boosting “clean energy” supplies; reducing emissions; contributing to grea…