Scandinavian Working Papers in Business Administration

Discussion Papers,
Norwegian School of Economics, Department of Business and Management Science

No 2014/6: Real-time versus day-ahead market power in a hydro-based electricity market

Thomas P. TangerĂ¥s () and Johannes Mauritzen ()
Additional contact information
Thomas P. TangerĂ¥s: Research Institute of Industrial Economics, Postal: Research Institute of Industrial Economics, Grevgatan 34 - 2 fl, Box 55665, SE-102 15 Stockholm, Sweden
Johannes Mauritzen: Dept. of Business and Management Science, Norwegian School of Economics, Postal: NHH , Department of Business and Management Science, Helleveien 30, N-5045 Bergen, Norway

Abstract: We analyse in a theoretical framework the link between real-time and day-ahead market performance in a hydro-based and imperfectly competitive wholesale electricity market. Theoretical predictions of the model are tested on data from the Nordic power exchange, Nord Pool Spot (NPS).We reject the hypothesis that prices at NPS were at their competitive levels throughout the period under examination. The empirical approach uses equilibrium prices and quantities and does not rely on bid data nor on estimation of demand or marginal cost functions.

Keywords: Hydro power; market power; Nord Pool Spot

JEL-codes: D43; D92; L13; L94; Q41

25 pages, February 28, 2014

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