I'm really bullish on the idea of a decentralized system for buying / selling renewable energy, especially solar.

The problem is, i don't see how this will be implemented in a decentralized way because energy requires hardware. Without hardware that connects electricity from one country to another, we cannot build decentralized grids. Implementation wise, there will still be a lot of centralization. When centralization happens, what then makes this company different from (or more importantly, what makes it better than) existing electric companies? Nothing.