Energy companies are worried. The industry's woeful record in customer service and regulator run-ins is well known. So is its battle against the lack of public trust in the industry as a whole. But for years a potentially greater concern has been brewing at the headquarters of established and independent suppliers alike.
The source of that concern is a multi-billion-pound Government mandated scheme to bring digitally connected smart meters to all British homes by the end of the decade.
Smart meters hold the potential for a revolution in how consumers use energy - and how energy companies engage with their customers - but suppliers are warning that the £11bn scheme risks being derailed by years of delay to the technology at its heart.
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