This paper investigates whether the pricing of forward contracts in the Nord Pool market is efficient. Monthly forward contracts were introduced in the Nord Pool market in 2003. Likewise, quarterly contracts that will replace seasonal contracts were introduced in 2004. For a transition period these contracts together with the pre-existing seasonal and yearly contracts constitute the forward market. In an efficient forward market the price of a seasonal forward contract should equal the time-weighted average of the underlying monthly forward contracts. In this paper we use historic forward price information to evaluate whether this relationship holds true and find that there are inefficiencies in the pricing. (c) 2005 Elsevier Ltd. All rights reserved.