Energy customers are being short-changed by “perverse” government targets to install electronic smart meters in homes across the UK, according to the consumer campaigner Martin Lewis.

Lewis, the founder and chair of MoneySavingExpert.com (MSE), has written to Ed Miliband, the secretary of state for energy security and net zero, warning that installations are being prioritised over repairs, leaving thousands of households facing shock bills because their meters have malfunctioned.

Last December, the artist Grayson Perry reported that his monthly electricity charge had soared from £300 to £39,000 because of a faulty smart meter. Lewis wants suppliers to be incentivised to fix faulty meters as well as installing new ones.

“I am writing to you […] to warn of the brand damage that risks making the government’s targets framework perverse,” Lewis said in his letter. “A rethink is needed – specifically I’d suggest shifting firms’ targets from smart meter installations to the overall number of ‘working’ smart meters, which would incentivise firms to do both installations and repairs.”