CEZ said that it will disconnect the first block of NPP Temelin (capacity of 1,000 MW) due to a fault in the cooling system. The second block has already been already disconnected (since the beginning of April) for regular replacement of fuel. CEZ said that it will cover the shortage from the Detmarovice coal power plant. The replacement will double the variable costs per replaced MWh as direct costs per MWh produced at coal power plant are approx. double those of MWh produced at NPP. We estimate that 1 day of disconnection of 1 block of NPP Temelin equals extra costs of CZK0.01 per share.