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After 25 years, their production has dropped to 80%.

Unlike what you imply, they don't explode and you have to replace them all. They just keep producing, but less.

I don't know about others but personally I'd like my electricity source to not be constantly degrading over time and requiring maintenance crews to go out and replace the panels as they randomly start falling below the required efficiency levels. I'd prefer if the entire production unit was a single all-inclusive compound maintained by the team on site, with a relatively compact ecological footprint.

So tell us what you have there that doesn't need maintenance over 25 years.

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