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Hawaii Gas Co. to recycle biogas produced at sewage plant

April 18, 2017 - 11:13am

HONOLULU (AP) — Honolulu officials say they are moving forward with plans to sell biogas produced at the city’s sewage plant to Hawaii Gas Co.

The gas company says it plans to spend about $5 million on equipment to clean the sewage plant’s biogas before adding it into their pipelines. It also wants to construct approximately one mile (1.61 kilometer) of new pipeline to connect its purification system to the company’s existing synthetic natural gas pipeline.

Hawaii Gas would buy gas from the city at $2 a therm, the Honolulu Star Advertiser reported. Biogas is fuel comprised of about 60 percent methane and 40 percent carbon dioxide, which the Honouliuli Wastewater Treatment Plant had been capturing and burning off.

The city’s biogas would make Hawaii Gas’ fuel supply 5 percent renewable, according to the company.

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