British Gas is poised to offer customers free electricity on Saturdays, according to a report in the Financial Times (£).
Centrica, which owns British Gas, hopes the tariffs would encourage customers to concentrate their energy use at weekends when overall demand is low.
Proposals for the new energy tariff, which could be introduced next year, are similar to deals offered by American provider Direct Energy, a sister company of British Gas.
More top news
Mr Blavatnik, whose empire includes the Warner Music Group, has an estimated fortune of £13.17bn according to the Sunday Times Rich List.
Find out what to expect from the weather if you are running in the big race in London or watching from the sidelines.
It will be a soggy start to the weekend and temperatures will drop making it feel colder than in recent days.