NRLA, MEES, EPC, energy efficiency

27 Jul 23

Back in February research showed that Energy Performance Certificates were inaccurate at best, useless at worst, and easily rigged.

A Sunday Times report revealed the results of sophisticated and highly detailed research by a firm called CarbonLaces. The firm claimed EPCs overestimate energy use by up to 344 per cent yet they remained a key part of current and expected legislation affecting landlords and other home owners.

CarbonLaces compared the EPCs of more than 17,000 homes with their actual use, as logged by smart meters every half hour for at least 300 days, to calculate their energy bills. 

The Sunday Times reported: “The average metered gas and electricity use for all the properties studied was 125kWh per square metre a year — 91 per cent lower than what their EPCs claim (239kWh/m2/yr).

“The lower the EPC rating, the bigger the overestimation. For properties with the worst rating of G, EPCs estimate they use 656kWh/m2/yr. Yet their smart meters show they use only 151kWh/m2/yr — a 344 per cent gap.”

This inaccuracy is “quite staggering” said Madhuban Kumar, the founder of CarbonLaces.

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