Innovations in technologies that produce energy (such as solar and wind) have over time brought new mixes of energy into existing networks for distribution. What has lacked is a breakthrough that can deal with intermittency of renewables in that system or the ability to store it when it is generated. Off-grid energy solutions, particularly for the developing world, have for decades been too small and not been able to genuinely get people up the energy ladder as their livelihoods improve. While business models and the technology, particularly solar, have matured, the Holy G
