In 2008 the Congressional Budget Office estimated the value of the subsidy at only $600,000 per reactor per year, or less than one percent of the levelized cost for new nuclear capacity. All such calculations are controversial, as they rely on the difficult assessment of extrapolating what the "true" probabilities are of a catastrophic event at the extreme cost brackets. Due to the structure of the liability immunities, as the number of nuclear plants in operation is reduced, the public liability in case of an accident goes up. However going in the other direction, the Nuclear Waste Fund was/is used to transfer $750 million in fee revenues each year from utilities to the Government and this is hard currency, unlike the conceptual insurance/indemnity Act.