The N.S.W. Government has approved a major Hydrogen Gas project. It is proposed to convert water to Hydrogen using renewable electricity and inject the Hydrogen into the existing Gas supply.

Renewable, Green Gas, Trial Gets the Go Ahead.
Sydney homes and businesses could use ‘green gas’ in as little as five years for cooking, heating and hot water thanks to Australia’s largest renewable gas trial. >>

https://jemena.com.au/about/innovation/power-to-gas-trial