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Why should these devices last only 14.5 years? Are they appreciably different from the turbines in dams which operate for decades.

If one assumes a more typical 30 year lifetime for 'big stuff', then the Royals will be getting their power for half price.

And why not give the Royals some credit for being early adopters, the folks who pay more for emerging technology which then allows the technology to mature and drop in price for the rest of us.