Construction of the Kalkar reactor was completed in the middle of 1985, but a new state government was clearly against the project, and opposition mounted following the Chernobyl disaster in April 1986. In March 1991, the German federal government said that the SNR-300 would not be put into operation; the project costs, originally estimated at $150 to $200 million, escalated to a final cost of about $4 billion (equivalent to about $B in ).