It is understood that the trust is seeking to move away from its benefit-focused ads, which inform consumers of savings they can make by being more energy-conscious, in favour of an overarching brand strategy.
The news comes as the organisation starts work to raise consumer awareness of the government's Energy Efficiency Commitment.
EST's £2.2m, five-week campaign breaks on 14 February. The activity includes TV, print, online and radio advertising.
It is believed that a total of four agencies have been shortlisted to pitch for the Energy Savings Trust's advertising business, including Rainey Kelly.
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