 In August 2006 three of Sweden's ten nuclear reactors were shut down due to safety concerns following an incident at Forsmark Nuclear Power Plant, in which two out of four emergency power generators failed causing a power shortage.It was classified as a grade 2 incident in the INES scale, due to the degradation of defence-in-depth.In 2006 the Centre Party of Sweden, an opposition party that supported the phase-out, announced that it was dropping its opposition to nuclear power, at least for the time being, claiming that it is unrealistic to expect the phase-out in the short term.