How to store clean, renewable energy? That’s a big question for the future of energy. Many initiatives, like Tesla’s powerwall, see the solution in batteries. But that’s not the cleanest and most sustainable option. The hydrogen fuel cell possibly presents a better alternative. That’s what a French energy company wants to show on a small island off the coast of Singapore. The company is building a small, self-contained power grid on Semakau to demonstrate the usefulness of hydrogen gas in converting intermittent power from solar panels and wind turbines into stored fuel that can generate