Frequency and balance control. For the frequency control of the Nordic synchronous area and the balance in DK1, the available mFRR balancing energy bids on the common merit order list are used in the order of price. The Nordic LFC block centrally activates aFRR from a single Load Frequency Controller (LFC). Based on the measured frequency, this LFC calculates the required activation of aFRR and distributes the activation requests to the Nordic TSOs pro-rata to the TSOs’ shares. Consequently, each Nordic TSO distributes the requests to the contracted aFRR providers in its control area. For each hour, the mFRR balancing energy prices are determined for all bidding zones. The mFRR balancing energy prices are set at the marginal price of activated mFRR balancing energy bids in the common merit order list. When no activation for balancing purposes are performed in one or both directions, the mFRR balancing energy price for the relevant direction(s) will be equal to the price in the day-ahead energy market. When congestions do not arise during the hour of operation (i.e. if there is only one uncongested area), the prices in all bidding zones will be equal. The methods to define balancing energy prices for aFRR are defined nationally. There may be available cross zonal capacity during the hour of operation even if there is a congestion in the energy market. This available cross zonal capacity can be utilised for exchange between the TSOs. When a congestion arises during the hour of operation between bidding zones, uncongested areas will be defined which will obtain their own mFRR balancing energy prices. The mFRR balancing energy prices will be determined by the marginal price of the bids activated within each uncongested area. In case of bidirectional activation for an hour in an uncongested area, the hour shall for settlement reason be defined as an hour with net upward balancing or an hour with net downward balancing depending on the net activated mFRR balancing energy. If no activations have taken place or if the net volumes upwards and downwards are equal, the imbalance price will be set at the day- ahead market price. Congestions to/from a bidding zone which are caused by imbalances within a bidding zone are dealt with as activation for balancing purpose and give rise to defining more uncongested areas. Congestions caused by a reduced transmission capacity to/from a bidding zone, after day-ahead market closure, are managed using activations for system constraints. A prerequisite for a TS...
Frequency and balance control. For the frequency control of the Nordic synchronous area and the balance in DK1, the available mFRR balancing energy bids on the common merit order list are used in the order of price. The Nordic LFC block centrally activates aFRR from a single Load Frequency Controller (LFC). Based on the measured frequency, this LFC calculates the required activation of aFRR and distributes the activation requests to the Nordic TSOs pro-rata to the TSOs’ shares. Consequently, each Nordic TSO distributes the requests to the contracted aFRR providers in its control area.
