Had such a conversation with a Chief of a station in Eureka, CA asking for a studio backup generator. So I asked the question; how many power outages over one hour have occurred in the last ten years? Longest one was ten minutes. Next question; how much would a backup generator at the studio cost? Around $60K. Were any lost spots in that ten minutes unable to be made good? Answer: no spots were lost. Okay worst case; you lose power for a full day. Assuming you can only make good 50% of the spots, would that equal $60K? They stopped asking for a backup generator at the studio.