The capex of an unreliable power source's backup/stopgap is a cost of using that unreliable power source, and should be attributed as such. It is not a cost/ef

The capex of an unreliable power source's backup/stopgap is a cost of using that unreliable power source, and should be attributed as such. It is not a cost/efficiency that is attributable to the inherant characteristics of the backup source. That would be like blaming a relief pitcher for what happened in the innings he didn't pitch.