As if ICEs are going to be replaced for emergency power generation any time soon. And with new tech coming out where regular gasoline engines can be as efficient as diesels (in fact using the Diesel cycle to a degree) if not more, you're going to find a resurgence of them in hybrid-electric vehicles. I doubt you're going to be rolling around with a solar-powered weed-eater to do your yardwork. I can guarantee you are…
They already have electric weed-eaters. I can easily imagine those engines having a battery, complete with a solar powered charger, likely with an option for direct power. If your house power is solar as well, it still works.
I don't think this stuff is hard to imagine.
Large earth movers are a different beast, simply because of the heavy load. I predict these will be much further off. But so long as they have enough power, I don't see the issue with them being electric at some point.