UK discounted provision for decommission costs:

£100+ billion in 2013 https://www.theguardian.com/environment/2013/jun/23/britain-...

£161 billion in 2017 https://web.archive.org/web/20170516093449/https://www.gov.u...

£234 billion in 2018 https://www.gov.uk/government/publications/nuclear-provision...

... and counting.