text: Yoh Controller, were you aware that a coal or gas fired "steamer" spends a month in maintenance for every month in service? So much for fossil fuel generation via steam. Nuclear plants used to have a similar ratio, but the USA government mandated them to have a second set of steam handling equipment installed to provide close to continuous operation.
  
  The high ratio of down time for steam processing generators provided Enron and TransAlta with phoney excuses for shutting down plants during peak demand periods. They are supposed to schedule the planned maintenance for off peak hours.
  -- 
  https://www.youtube.com/watch?v=nWCtKqYnLXA
  (Enron staff "being creative" about finding excuses to shut down a generating station for a "forced outage" for maintenance)