Energy firm npower has pledged that its smart meter installers will not push sales while fitting the devices in customer homes. The provider is the first Big Six member to make the pledge to Which?.

The consumer watchdog is concerned that energy suppliers will take advantage of the smart meter roll out, dictated by the government, that is set to see 53 million smart meters put in UK homes by 2019.

Which? wants to prevent ‘stealth salespeople’ entering homes disguised as installers. Richard Lloyd, executive director at Which? said: “We’re pleased that npower is acting in the best interests of its customers by signing up to our promise of ‘no selling, just installing’. We urge the rest of the major suppliers to do the right thing and sign up today.

Other firms that have signed up to the smart meter promise include Co-operative Energy, Ecotricity, First Utility, Good Energy, Ovo, Spark Energy, and Utility Warehouse.