Tories who for years dismissed a much-needed energy supply shake-up as "green crap" left hard-pressed families saddled with eye-watering bills, Keir Starmer has fumed.
The Labour leader said voters are now paying the price of "Tory crap" as he outlined his plans to transition to green energy.
If he becomes Prime Minister, Mr Starmer said, householders will save an average of £1,400 under sweeping plans to cut dependence on oil and gas.
The Labour leader said the "moment for decisive action is now" as he doubled down on his vow to block new oil and gas drilling in the North Sea.
But he pledged not to make the same mistakes as the Thatcher Government over the brutal closure of mines in the 1980s, amid fears tens of thousands of jobs could be lost in the sector.
Mr Starmer told an audience in Edinburgh that the UK can't wait for supplies of fossil fuels to run out before acting - saying years of failure to address this hit hard when Russia invaded Ukraine.
He said: "The Tories can contest it, but look around the country – this is part of our problem, sticking plasters everywhere.
"I’ll give an example: 'green crap'. That’s what they said – 'cut the green crap'.
"And so they scrapped investment in home insulation, stalled nuclear energy, banned onshore wind.
"The result? When the crisis hit last year and when Russia invaded Ukraine, not only did the bills of businesses and working people go through the roof, we had to borrow £40bn with no new infrastructure to show for it.
"That’s not green crap, that’s Tory crap."
Labour claims its Green Prosperity Plan - which it claims will make the UK the first major country in the world to run on 100% clean and affordable power by 2030 - will create more than one million jobs over 10 years.
A new publicly-owned clean energy company, named GB Energy, will be based in Scotland, the party announced, focusing on creating jobs and setting up supply chains.
A Tory ban on new onshore wind farms, which the party estimates costs families a massive £5.1billion a year will be lifted, Mr Starmer announced at the HQ of green energy firm Nova Innovation.
He said if he becomes PM the Government will not grant licences to explore new fields in the North Sea will not be issued, but said projects already in place by the next General Election will not be scrapped.
This means the controversial Rosebank oil field, 80 miles off the Shetland coast, is likely to go ahead - and Mr Starmer said he will not shut it down.
But Labour's plans have sparked a backlash from energy giants and trade unions, who warn of sweeping job losses.
According to Offshore Energies UK, the sector supports 200,000 jobs in the UK, including 90,000 in Scotland.
But the Labour leader said doing nothing isn't an option, and said that workers should not fear the changes that lie ahead. Labour maintains that oil and gas extraction will still be happening in the 2050s.
He said: "I know the ghosts industrial change unearths.
"As a young lawyer, I worked with mining communities to challenge the Tories’ pit closure programme but deep down, we all know this has to happen eventually and that the only question is when.
"If we wait until North Sea oil and gas runs out, the opportunities this change can bring for Scotland and your community will pass us by, and that would be a historic mistake.
"An error, for the future of Scotland, as big as the Thatcher government closing the coal mines, while frittering away the opportunity of the North Sea."
He said there would be no "cliff edges", instead saying Labour has a "credible plan to manage the change, protect good jobs and create good jobs".
He revealed that his planned state-owned Great British Energy company - first pledged in at the Labour Party Conference in September last year - would be based in Scotland, but did not specify where.
Lashing out at the Tories and the SNP, Mr Starmer warned that the current chaos engulfing British politics is doing massive harm to international investment.
He said: "Look at them both now and look hard. The soap opera that continues to demean Britain’s reputation.
"What do they have to say to the investors who tell me, ‘this is a great political comedy, but we don’t see Britain as a stable investment anymore?’
"They aren’t serious."
Shadow Chancellor Rachel Reeves, who appeared alongside Mr Starmer, said: "While other countries take the decisive action needed, the Conservatives are carping from the sidelines."
And Ed Miliband, Shadow Secretary of State of Climate Change and Net Zero and former Labour leader, said: "Keir is putting this issue at the forefront of the country like none of us did before."
Greenpeace UK campaigner Ami McCarthy said: "If Labour makes good on these commitments, it would be on the right path towards demonstrating real climate leadership, in stark contrast to the current government."
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