Calculation and allocation of the costs for imbalances is performed in accordance with the principles for their allocation, laid down in the general terms and conditions of the balancing group coordinator. Electricity producers, including those who produce from renewable sources, shall pay costs to cover imbalances in the respective balancing group in which they are members only in the case of a difference in the schedules submitted by them and the actual production. Where the producer does not submit a production schedule, the coordinator of the relevant balancing group shall draw one up on its behalf. Producers shall be balanced and pay for the imbalances caused to the system, which the coordinator has calculated, according to the methodology approved by EWRC for allocation of the imbalances between the members of the balancing group.