June 10, 2023. Natural Gas Vehicles for America (NGVAmerica) and Coalition for Renewable Natural Gas (RNG Coalition) – with partners California Natural Gas Vehicle Partnership and California Renewable Transportation Alliance –announced that California fleets fueled with bio-CNG achieved carbon-negativity in their transportation operations last calendar year for the third straight year.
Renewable natural gas (RNG) accounted for 97% of all on-road fuel used in natural gas vehicles in California in 2022. According to data from the California Air Resources Board (CARB) the annual average carbon intensity score of bio-CNG in that mix was -98.98 gCO2e/MJ.
Captured above ground from organic material in agricultural, wastewater, landfill, or food waste, RNG can produce carbon-negative results when fueling on-road vehicles like short- and long-haul trucks, transit buses, and refuse and recycling collection vehicles.
“When used as a transportation fuel, RNG displaces gasoline and diesel in applications that are difficult – if not virtually impossible – to electrify,” said Daniel Gage, President of NGVAmerica. “California fleets running on RNG achieve a carbon negative result today, making RNG better than zero.”
The use of RNG as a transportation fuel in California grew 169 percent over the last five years. NGVAmerica and RNG Coalition report that in 2022 a total of 197.45 million gallons (DGE) of natural gas were used as motor fuel in the state. Of that, 190.46 million gallons (DGE) were from renewable sources.
“RNG facilities address methane emissions from society’s inevitable waste streams, mitigate the environmental impacts of those emissions and convert captured methane into domestic, renewable, clean fuel and energy,” said Johannes Escudero, Founder & CEO of RNG Coalition. “These numbers highlight the critical role that RNG plays in decarbonizing the transportation sector today.”
Data from CARB’s Low Carbon Fuel Standard program confirms that bio-CNG remains the only net-zero carbon motor fuel in California’s alternative motor fuel portfolio, which includes ethanol, biodiesel, renewable diesel, bio-CNG, bio-LNG, electricity, alternative jet fuel, and hydrogen.
In addition to their negative greenhouse gas (GHG) emissions, ultra-low NOx medium- and heavy-duty RNG-fueled trucks and buses perform at levels that are 95 percent below the federal nitrogen oxide (NOx) standard and 98 percent below the federal particulate matter (PM 2.5) standard. NGVs virtually eliminate criteria pollutant emissions that contribute to asthma, heart disease, and poor air quality.