Sammendrag
We present a hydropower scheduling model for coordinated trade in the day-ahead and balancing market with alternative ways to represent generator start/stop decisions. A case study on a branch of a Norwegian water course is conducted, with analysis going in two directions: how does the start/stop feature influence the added value of balancing market trade as opposed to day-ahead trading only, and how well do the alternative start/stop modeling versions perform with and without balancing market trade. The results indicate that the added value of balancing market trade is small, and relatively insensitive to the choice of start/stop modeling. A linear approximation of start/stop gives a good approximation of the expected profit, but frequently present non-implementable operational decisions.