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The current threshold for participation in the Energy Company Obligation and Warm Home Discount is 200,000 domestic customer accounts and this is changing to 150,000 customer accounts from 1 April this year.
In the final stage impact assessment for ECO3, published in October 2018, we estimated that suppliers over the 200,000 threshold covered 96% of the market and those over 150,000 covered 99%. While the number of energy suppliers in the market and their customer numbers fluctuate, we expect the current market coverage to be similar now.
How energy suppliers pass on their costs depends on their individual pricing decisions.