French utility ENGIE is reportedly planning to ditch natural gas by 2050.
Chief Executive Isabelle Kocher told reporters the company is aiming to switch all of its gas operations to biogas and renewable hydrogen during that period.
The company has around 70 biogas projects worldwide, including 40 in France.
It estimates biogas from agricultural and other waste, without using food crops, has the potential to grow from around 1% of gas use in France to 10% by 2025, 30% by 2030 and 100% by 2050.
ENGIE also wants to develop hydrogen production units, converting electricity produced by renewable sources into gas to power fuel cell vehicles.
Ms Kocher has been reported as saying: “We will progressively make our gas greener so that by 2050, it can be 100% green.”