I don't think the miners can exactly decentralize the energy grid but they have definitely helped grow the grid on many occasions, some of which were actually very positive. For example a couple of years ago I read something about our government working with the miners to work on infrastructure to use the Gas Flare (wasted gas produced during gas and oil extraction) to generate electricity. Something that led to establishing massive projects to catch and use a whopping 20 million cubic meter flare gas (700 million cubic feet) on a daily basis.
That's a great initiative both for the environment and BTC alike: as I've read, they generated around 53MW doing this (don't know whether overall or from one of such operations), and Bitcoin miners like Antminer S19 XP consume around 3kW, so with such power, it could power around 17,667 of such miners.