Staff at its Luton HQ are understood to be finalising details of the ‘price realignment’, with details to be revealed on the press day at Frankfurt.
"It will just give the Ampera a bit of a lift, hopefully a bit of a boost to sales," said a well-placed insider.
If Vauxhall adopts the same percentage price cut, the £29,995 Ampera will come down to around £25k, once the government grant of £5000 is factored in.
Earlier in the day Vauxhall-Opel boss Karl-Thomas Neumann told a conference that a price cut of €8000 would reduce the entry-level list price of the Opel Ampera in Germany to €38,300.
"We really want to support E-mobility so making the Ampera more affordable is good for that," he said.
The revolutionary plug-in electric car has struggled to fulfil its sales promise, partly because the recession has deterred buyers from adopting less-conventional technology.