Israel-Palestine and Russia-Ukraine are not really about power or oil or gas. They're about land*, and no quantity of solar panels and wind turbines will fix that.
The people born in Palestine or Ukraine don't want to build a new country in the ocean using limitless energy. They want to stay in their homes. The same is true for most people, I'd wager.
Wouldn't justice be a cause for wars too? Even if energy was limitless or extremely cheap, this wouldn't mean people will stop being mean right? Something else will become too valuable and greed and other human traits will cause injustices and people will still fight to enforce/overthrow the injustice no?
* not just land, but ultimately, land