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February 9, 2026
New facility expands access to dairy-derived biomethane across the region
October 7, 2025
Collaboration to deliver deeply carbon-negative hydrogen using dairy biogas to fuel heavy-duty transportation across California.
October 3, 2025
In late September, Maas Energy Works successfully completed a $6.4 million project to power its Lakeside Pipeline dairy biogas upgrading facility with solar electricity, offsetting approximately 90% of the plant's power consumption.
October 3, 2025
Family-owned Maas Energy Works deploys Qube’s low-cost environmental monitoring solution at over 20 lagoon digesters, empowering operational intelligence.
September 17, 2025
Cows produce more than just milk, they also generate manure.
September 16, 2025
Clean Energy Fuels Corp. (NASDAQ: CLNE) has announced it has broken ground on three renewable natural gas (RNG) production facilities under its development agreement with Maas Energy Works.
June 15, 2025
The Fernandes family has been dairying in California’s San Joaquin Valley since the 1920s, when Frank Fernandes came over from the Azores and started milking cows during the Great Depression.
June 9, 2025
Executive Outlook: A CONVERSATION WITH DARYL MAAS, CEO, FOUNDER, AND OWNER OF MAAS ENERGY WORKS
May 6, 2025
A crowd gathered at Volleman’s Family Farm Thursday, June 20 for a ribbon cutting as the celebrated bottled milk business and dairy made a commitment to lessening environmental impact by safely harvesting gas to help provide power to their neighbors.
April 29, 2025
In this episode of The City Builders Podcast, host Todd Jones sits down with Daryl Maas, CEO, and Christianna Maas, Vice President of Maas Energy Works — a national leader in converting agricultural waste into renewable energy, with headquarters in Northern California.
March 2, 2025
Founder & CEO Daryl Maas & Vice President Christianna Maas
June 24, 2024
A crowd gathered at Volleman’s Family Farm Thursday, June 20 for a ribbon cutting as the celebrated bottled milk business and dairy made a commitment to lessening environmental impact by safely harvesting gas to help provide power to their neighbors.
May 7, 2024
Clean Energy Fuels Corp. (Nasdaq: CLNE), the largest provider of the cleanest fuel for the transportation market, and Maas Energy Works, the nation’s largest dairy digester developer, today announced a new joint development agreement to build nine renewable natural gas (RNG) production facilities at dairy farms across seven states.
April 24, 2024
California’s dairy industry injects more than $21 billion into the state’s economy and supports 189,000 jobs while accounting for around half of California’s total methane emissions.
April 10, 2024
Cows, with their four-chambered stomachs, have always been models of digestive proficiency, as anyone who’s dodged cow pies in a pasture can attest.
October 1, 2020
Cows, with their four-chambered stomachs, have always been models of digestive proficiency, as anyone who’s dodged cow pies in a pasture can attest.
August 1, 2019
Calgren Dairy Fuels completed a dairy renewable natural gas facility in California – the first of its kind in the state.
July 31, 2019
On Monday, Southern California Gas Co. (SoCalGas) joined Calgren Dairy Fuels, and state and local elected officials to announce the completion of Calgren’s dairy renewable natural gas facility.
July 30, 2019
Southern California Gas Co. (SoCalGas) joined Calgren Dairy Fuels, and state and local elected officials yesterday to announce the completion of Calgren’s dairy renewable natural gas facility.
July 29, 2019
Southern California Gas (SoCalGas) joined Calgren Dairy Fuels to help clean up the reputation of cows as they, along with local and state officials, celebrated the completion of Calgren’s dairy renewable gas facility.
May 31, 2019
Maas Energy Works (MEW), based in Redding is leading clusters of dairies in Merced and Denair in installation of “Dairy Digester” systems.
April 1, 2019
Maas Energy Works (MEW), based in Redding is leading clusters of dairies in Merced and Denair in installation of “Dairy Digester” systems.
March 21, 2019
Ambitious emission reduction laws invigorate new dairy practices.
February 28, 2019
Joey Airoso's dairy was the first to start delivering methane gas to Calgren Renewable Fuels last August.
February 19, 2019
Southern California Gas Co. and biogas producer Calgren Dairy Fuels announced Feb. 14 that renewable natural gas produced at Calgren's dairy digester facility in Pixley, California, is being injected into SoCalGas pipelines. The project marks the first time that carbon-negative renewable natural gas produced from cow m

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