
Npower's £9.5m ad account is handled by Beattie McGuinness Bungay; its direct marketing by EHS Brann; and digital by Grand Union, none of which has been invited to repitch. Media agency Vizeum's tenure is unaffected by the review.
No one at Npower was available for comment.
In January, Npower rolled out an ad campaign for its Home Team service featuring Aardman Animation characters Wallace and Gromit.
It is also in talks with the ECB over renewal of its sponsorship of domestic Test cricket series.