Among methods that produce what is known as green hydrogen are electrolysis to split water into hydrogen and oxygen using power from renewables. The technology for shipping hydrogen is still in early stages of development, said Chevron's vice president of hydrogen Austin Knight. About 30-35% of the total energy system will need hydrogen to decarbonize, he said. NextEra is working with the U.S. Treasury on rules that govern what can be considered green hydrogen, he said. The process is complicated by the variability of renewable power supply from wind and solar, he said.

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