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Renewable Natural Gas (RNG) is natural gas that is created by capturing and then converting biogas that is generated by organic matter as it decomposes. RNG can be produced from a variety of waste stream and renewable biomass sources including wastewater treatment plants and landfills. RNG is an ultra-clean fuel and is considered carbon-negative because it converts more greenhouse gases than it emits.
Hawai‘i Gas was the first in the state to capture and process biogas from the City and County of Honolulu’s Honouliuli Wastewater Treatment Plant on O‘ahu and convert it into RNG. This facility produces up to 800,000 therms of energy per year, enough gas for more than 6,0001 homes. At the same time, this RNG project reduces the need for approximately 15,000 barrels of oil and reduces greenhouse gas emissions by the amount produced by 400 cars annually. Additionally, since the facility went live in 2018, the City and County of Honolulu generated approximately $2.53 million of revenue by selling the biogas to Hawaiʻi Gas.
One of the priorities for the clean energy future of Hawaiʻi Gas is a focus on RNG which already exists in our energy portfolio yet has room for continued growth through exploration and innovation. On Oʻahu, RNG is used primarily through our 1,100 miles of pipeline network that is fed from our production plant in Barber’s Point. Our underground network currently accommodates a mix of synthetic natural gas (SNG), RNG and up to 15% hydrogen.
Hawaiʻi Gas is also evaluating other projects and new technology that could further diversify and decarbonize our fuel mix. As we better understand the capability of delivering a modified mix of fuel to our customers in a seamless way, Hawaiʻi Gas will continue to invest in adapting the existing infrastructure as needed.

1. Based on average household use of 11 therms/month by HG customers
Renewable Natural Gas is currently being produced by capturing and converting biogas that is being emitted from the Honouliuli Wastewater Treatment Plant. 

Detecting a Leak

If you suspect a gas leak inside your home or business and cannot shut off the gas, immediately evacuate the area and contact 911. Common signs of a gas leak include:

  • Odor of rotten eggs. Although natural gas does not have a perceptible smell, Hawaii Gas adds an odorant to our product for this very reason: safety and leak detection!

  • An unusual hissing or blowing noise from a gas appliance, the ground or exposed gas piping.
  • Flames near exposed piping or coming from the ground. Appliance flames that are behaving in an unusual way.
  • Constant and localized blowing of dirt, dust or debris.
  • Rapid bubbling at the surface of a body of water such as a puddle.
  • Unusual brown, dying or dead vegetation in otherwise moist areas over or near pipeline areas as well as unusual soil movement.
  • Damaged connections to gas appliances.
  • A sudden and unexplained increase in gas consumption on your gas bill.
What To Do And Not Do If You Detect A Gas Leak
  • Immediately put out all smoking materials and other open flames.
  • Turn off machinery and engines and don’t use cell phones or electrical switches.
  • Turn off the gas at the tank or appliance if it is accessible and safe to do so.
  • Ventilate the area by opening windows if indoors.
  • If the leak is outside and underground, do not fill the hole with water.
  • If there is a gas fire, do not try to extinguish it unless you are able to shut off the source of the gas.
  • Immediately leave the area and warn others to stay away.
  • Call the Hawaiʻi Gas office nearest you if there is no immediate danger or call 911.
  • DO NOT attempt to turn the gas back on by yourself – contact Hawaiʻi Gas to have a trained, qualified energy professional restore your service.
  • DO NOT rely on your sense of smell alone to detect the presence of natural gas or propane gas.
Learn More Safety Tips When Using Gas
Recognizing Women's Contributions

At Hawaiʻi Gas, we celebrate the diversity of our workforce and acknowledge the importance of providing an equitable and inclusive environment for our employees. In honor of International Women’s Day 2022, we are proud to recognize the contributions of all the women who work for Hawaiʻi Gas both past and present. Their influence and impact through the years undoubtedly helped build the company into what it is today.
A few years ago, a Hawaiʻi Gas employee group called WAVE–which stands for women are valuable energy–was formed to be an internal resource for women in the workplace and ensure equal representation and opportunities for all employees. We’re proud to support WAVE and the contributions they have made and commit to collectively work to Break The Bias in our work 'ohana and community.

1938 Indochine

Tucked away in the bustling neighborhood of Kaka'ako you can find this gem designed and created by founder, Kevin Aoki. Showcasing flavors from Southeast Asia with European inspiration, the menu features eclectic dishes such as the Ooh La La Rice Field Chicken (aka frog legs), Saigon Warm Ribeye & Tofu, and Lemongrass Pork Ribs. 

What's new is a custom mobile app that was developed exclusively for the consortium of restaurants operating under the Aoki Group management team. Once you join "Aoki Group Rewards" you can earn rewards by dining at any of the Aoki Group restaurants such as 1938 Inodchine, Herringbone, Doraku Sushi, Aoki Teppanyaki, Qing Mu Noodle and even Blutree Cafe which is a fresh juice bar. You can also make reservations and contact restaurant managers through the app. For more information, go to

GET Aoki Group Rewards
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