The name change follows the £1.37bn ($2.24bn/EUR2.07bn) purchase of TXU Energi's customers by Powergen.
Powergen is committed to the three-year sponsorship deal which was announced in July 2002. Powergen also currently sponsors rugby union's equivalent knockout tournament, the Powergen Cup.
Said Richard Lewis, RFL executive chairman said: "We have already created an excellent relationship with TXU Energi and have no doubts that this will continue with Powergen, indeed the same team of people as before are working with us on a daily basis. Together we will be working hard to maintain the Powergen Challenge Cup as one of the leading sporting events in this country."
