By Tom Espiner
Business reporter, BBC News
Energy firms volition statesman penning to customers wrong days to pass them of measure increases from the commencement of April.
Firms person to springiness customers tenable announcement of terms rises oregon changes that volition permission them worse off, according to Citizens Advice.
Typical household vigor bills are acceptable to emergence to £3,000 per twelvemonth adjacent month.
The BBC understands the authorities is reviewing the level of vigor enactment it gives households amid warnings galore much could look difficulties.
At the moment, the authorities is limiting the emblematic household measure to £2,500 a year, positive a £400 wintertime discount, which volition besides extremity from April.
But from 1 April the assistance volition beryllium scaled backmost pushing bills up.
Nearly 2 cardinal much households could conflict to wage the higher bills, campaigners person said.
Energy UK, which represents suppliers, said firms would beryllium penning to customers to fto them cognize however overmuch their bills were going up wrong the adjacent fewer days.
Suppliers are waiting for the authorities to corroborate the level of enactment households volition get earlier sending the letters, and that is owed to hap wrong days.
Customers who are having trouble paying their bills should interaction their supplier. Firms person a scope of fiscal and different enactment available, an Energy UK spokesperson said.
However, helium said determination "is a bounds to what the vigor manufacture tin do".
Jeremy Hunt told maine a fortnight agone that each the assistance was "under review". The Treasury is privately pointing to that interrogation now.
It is looking a batch similar immoderate other support, but arsenic the Chancellor besides pointed retired to me, helium doubts helium has the country for a large caller initiative. However, postponing that simplification successful vigor enactment by a fewer months to a constituent erstwhile it is nary longer relevant, would not beryllium a caller initiative.
Some vigor suppliers person already begun a question of emails informing of the rise, and, crucially, pinning the emergence connected decisions of the government. For illustration British Gas wrote to customers saying "because of the changes the authorities is making to the vigor terms guarantee, the magnitude you wage for your vigor is owed to alteration this April".
Campaigners are besides calling it the "government's vigor terms rise", and asking for postponement of the summation to the vigor terms warrant from April to the summer.
Because of falls successful the wholesale vigor terms this volition hitch retired the rise, effect successful ostentation falling much rapidly, and assistance bounds the UK's economical downturn. But it volition decidedly outgo a fewer cardinal and could permission the Treasury exposed to tens of billions much if determination is immoderate unexpected renewed hike successful planetary state prices.
Fuel poorness campaigners said the fig of households that would person trouble paying for vigor from the opening of April, would emergence from 6.7 cardinal to 8.4 million.
The fig of radical who can't support their location adequately heated - which stands astatine 3.2 cardinal - would besides spell up, National Energy Action said.
The foundation is calling for much targeted enactment truthful that those who are struggling the astir get the astir help.
Without much authorities support, the fig of radical having to marque a prime betwixt heating and eating volition proceed to rise, a spokeswoman said.
Vulnerable people, specified arsenic those with wellness issues who request to usage much energy, are already self-disconnecting, she added.
Bill relief?
Energy Secretary Mr Shapps has said helium is "very sympathetic" to extending authorities support, and is successful talks with Chancellor Jeremy Hunt connected the issue.
The Institute for Fiscal Studies (IFS) said a amended economical outlook and falling wholesale vigor prices meant the UK was acceptable to get tens of billions of pounds little than expected this year.
This means the authorities has country to widen the vigor terms warrant for different 3 months to cushion the modulation to higher bills, its manager Paul Johnson told the BBC's Today programme.
Other organisations, including the Resolution Foundation, person said the authorities is precise apt to widen vigor measure support.
Energy UK urged the authorities to clasp the level of enactment astatine £2,500 for an mean household, "and to denote that rapidly truthful it tin beryllium incorporated successful lawsuit bills successful clip for April".
The Treasury declined to comment, including connected whether determination would beryllium an announcement connected further vigor measure enactment successful the upcoming Budget.
The BBC understands that its existent presumption is that falling wholesale vigor prices volition yet provender done to bills, and that arsenic prices fall, the authorities volition get little successful taxation receipts.
However, the level of vigor enactment is nether review, the BBC understands.
In a code connected Wednesday, Mr Shapps said firms should walk connected falling wholesale costs to consumers arsenic soon arsenic possible, and the UK should absorption connected "ever-greater" autarkic and cheaper energy.