 Most of the reactors were back in operation by next Spring, but Oskarshamn 1 remained down until January 1996 due to other work being carried out.During the late 1990s a unique capacity tax on nuclear power ("effektskatten") was introduced.It was initially set at 5514 SEK per MWth per month, and only applied to nuclear power plants, thus penalizing them relative to other energy sources.