The utilities company, which is official sponsor of England Cricket, will offer free membership of the club to customers signing up to its gas and electricity services.
Membership of the club, which was first revealed by Marketing (28 April), normally costs £45 a year. It gives fans first refusal on match tickets for all England home games as well as discounts on official England merchandise and publications.
Npower has signed up three England cricketers to promote the offer through ads on big screens at the grounds hosting the Test series between England and the West Indies, which begins next week. It is also planning radio advertising and a possible television campaign in the winter around live coverage of England's tour of South Africa.
Npower has sponsored England since 2000. Its current deal expires at the end of next season.
Cricket puts best foot forward, page 17.