Japan's Inpex has signed two separate sales and purchase agreements to supply what it described as "carbon-neutral" gas that has been certified through greenhouse gas emissions offsets.

The deals are part of the oil and gas operator's goals to achieve net-zero carbon emissions in its operations by 2050 and to work with its customers to reduce greenhouse gases.

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Inpex and Japan's Kiryu Gas said on Wednesday that they have entered into an agreement whereby Kiryu will use carbon-neutral gas purchased from Inpex in its own headquarters and associated facilities before rolling out the offset gas option to customers, including private households, beginning on 1 July.

The agreement resembles a sales and purchase deal signed earlier in June with Nihonkai Gas, which plans to supply its industrial and commercial customers with carbon-neutral gas purchased from Inpex this summer.

Inpex said the carbon neutrality of the gas "is based on carbon credits certified by a credible certifier as deriving from CO2 reduction efforts", including forest conservation projects.