Smart phones could make smart meters redundant, said the MPs Installing smart meters in every house in the UK will save consumers "only 2%" on their annual bills, a committee of MPs has warned.
The Public Accounts Committee (PAC) said that, on average, consumers will save just ?26 a year.
MPs also warned that the technology could be out of date by the time the roll-out is complete.
The Department of Energy and Climate Change (DECC) said smart meters will lower bills and make switching easier.
Installing the meters - which begins in earnest next year - will cost ?215 per household, or ?10.6bn.
Consumers in 53 million homes will be charged an annual amount on their bills to cover the cost, peaking at ?11 a year in 2017.
The ?26 annual saving does not include the cost of installation.
"Despite consumers footing the bill, they can on average make a saving of only 2% on the average annual bill of ?1,328 by the time the roll out is complete," said Margaret Hodge, the chair of the PAC.
"Even this is conditional on consumers changing their behaviour and cutting their energy use," she added.
'Redundant'
The Committee also said that some of the technology is likely to be out of date by the time it is installed.
At the moment the meters carry an in-house display, which tells consumers how much energy they are using at any given time, and how much it is costing.
The idea is that will encourage consumers to use less electricity and gas.
But the MPs said customers could receive similar information on smart phones.
That could make the in-home displays "redundant," said the committee.
DECC said there would be no up front charge to consumers for having a smart meter installed.
Energy minister Baroness Verma said: "Smart meters put power into the hands of consumers, bringing an end to estimated billing and helping people understand their energy use.
"The nationwide rollout is part of the Government's complete overhaul of the UK's energy infrastructure which will revolutionise the market and support the development of smarter electricity grids.
"It will help reduce consumer bills, enable faster, easier switching and give households control at the touch of a button," she said.
The project has already run into delays, and has been criticised elsewhere as a waste of money.
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BBC News - Smart meters will save only 2% on energy bills, say MPs
its going to cost ?10.6 bn minimum, so if the govs paying for it its coming out of every ones taxes, if the energy companies are paying for it your still paying for it with your bills, so really we are all paying the ?216 per household cost and ?11 per year extra on top off our bills, nothing smart about all this ffs 
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That won't happen
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