Ed Miliband is set to open up the North Sea to oil drilling thanks to the lifting of a ban on extracting the vital resource.
In January, Scottish courts ruled that two crucial oil and gas fields, Rosebank and Jackdaw, were unlawful.
But Miliband is set to change the law on greenhouse gas emissions - which the court relied upon in its ruling - paving the way for the construction of the giant oil field projects and the future of the UK fossil fuels industry as a whole.
Ministers are also expected to restart the approval process for the two oil fields on Thursday, with Energy Minister Michael Shanks in Scotland to announce the results of a consultation which will set the tone for the future of the North Sea.
Ed Miliband is set to change the law on greenhouse gas emissions
PA
Rosebank and Jackdaw, which Miliband had labelled "climate vandalism", had been blocked after environmental campaigners successfully challenged their oil and gas production licences.
Courts then ruled that Miliband's Tory predecessors were wrong to approve the projects without considering the emissions the oil and gas would generate from being burnt.
That ruling infuriated Shell and Equinor, both of which had already spent hundreds of millions of pounds on the projects, leading to furious meetings between their executives and senior ministers.