You can install renewable energy at home. If it's cheap enough to overbuild by 3-5x and the grid is overcharging for it then people will do that instead, and then the grid ceases to operate in most places. There is a non-trivial possibility of that happening regardless if storage gets cheap enough, because local generation and storage would remove the cost of distribution and outcompete the grid.

But also, that's crazy. You have the chance to offer the world cheap renewable energy and you're going to not? What kind of misanthropic policy is that?