C3H8, check out Daox' and Bennelson's plug-in riding mower conversions. You can replace a 23HP ICE with electric, it's just a matter of budget.
But a bigger issue is, why are you cultivating that many acres of turf? If that was mine, I'd take the portion I don't need and plant some black walnut there. In a few years, you'll have walnuts, and many years down the road, timber.
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