Germany's top utility, RWE, said on Wednesday it has agreed to supply French oil major TotalEnergies with about 30,000 tonnes of green hydrogen a year from 2030, in one of the sector's biggest deals.

The agreement is a signal for the German market because fuel suppliers such as refineries are encouraged to gradually reduce their greenhouse gas emissions over time. Using 30,000 metric tons of green hydrogen in a refinery saves 300,000 metric tons of CO 2 per year. That’s how much 140,000 cars emit on average per year.