Tens of thousands of households in Wrexham and Flintshire are potentially eligible for the council tax rebate.
New figures show that almost 100,000 households in the region are eligible for the payment as Chancellor Rishi Sunak provided more help amid the cost of living crisis.
Mr Sunak unveiled a range of financial support on Thursday to add to the £150 council tax rebate for almost every house between bands A to D.
This included a universal £400 grant to help pay for rising energy bills in October, a one-off £650 payment for those on means-tested benefits, a £300 grant for pensioners receiving winter fuel payments and £150 to those receiving certain disability allowances.
Valuation Office Agency figures show there were 44,370 properties classified between council tax bands A to D in Wrexham as of March 31 – 73% of the 61,090 total households in the area.
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In Flintshire, there were 48,000 properties classified between council tax bands A to D as of March 31 – 68% of the 70,640 total households in the area.
Charity National Energy Action praised the more targeted help ahead of an "utterly disastrous" winter for many who will be pushed into fuel poverty, but said this does not apply to the council tax rebate.
NEA said the current classification misses 600,000 households on low incomes, that vulnerable people not paying by direct debit are finding it difficult to access the rebate and that it holds "serious concerns" about the implementation of the rebate.
"Councils across England and Wales have their own way of administering the scheme, creating a postcode lottery for struggling households," added chief executive Adam Scorer.
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On announcing the £15 billion support package, which will be part-funded by a windfall tax on oil and gas firms, expected to raise £5 billion, Mr Sunak said: "This Government will not sit idly by while there is a risk that some in our country might be set so far back that they might never recover.
"That is simply unacceptable, and we will never allow it to happen."
Mr Scorer said the Government's extra response "averts the darkest of outcomes and offers some hope to the millions of fuel poor households across the UK", but also called on more long-term action.
"The Government urgently needs to plan for energy prices to remain high for the longer term," he added.
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