Green hydrogen, a clean energy source made from water and renewable power, could become competitive in a decade, according to French utility Engie. That relies on Europe setting up the necessary regulatory framework to drive up demand and slash costs, Sebastien Arbola, the company’s head of thermal generation and energy supply, said Tuesday in Paris. The “tipping point” for renewable hydrogen to compete with gray hydrogen — which is made from methane and emits carbon — could be in 2030-2035, he said.