Maas Energy Works – Covered Lagoon Digester

Home / Catalog Entries / Maas Energy Works – Covered Lagoon Digester

Maas Energy Works – Covered Lagoon Digester

Renewable Energy that Works

About the Company:

Maas Energy Works is the most successful developer-owner-operator of dairy manure digesters on the West Coast. Their motto is simple, “Renewable Energy that Works.” After hundreds of thousands of operating hours in five states and processing the manure on over 65 farms, Maas Energy Works knows how to build and run successful digester projects. Their projects are cost-effective and efficient, reliable in real-world field settings.

About the Solution:

In partnership with dairy farmers or other commercial facilities, Maas Energy Works specializes in developing, owning, and operating anaerobic manure digesters. Daryl Maas, president of Maas Energy Works, has learned about digesters not by selling them to others, but by building, owning, and operating them himself. Maas got started in cow power in Washington State with his brother Kevin. Together they built five operational digesters in Oregon and Washington as Farm Power Northwest, founded in 2007 and going strong today. In 2010, Maas continued to expand by bringing Maas Energy Works to California in order to explore the large renewable sector growth there. Today the company develops, builds, operates, and improves biogas projects all across the country, from Wisconsin to Texas, from California to Georgia and numerous states in between.

Maas Energy Works 3711 Meadow View Drive #100 Redding, CA USA 530-710-8545 Visit Company Website

Solution Type

  • Anaerobic Digestion


  • Project Developer


  • Energy


  • GHG
  • Odor
  • Pathogens

To view additional information about this vendor, click below.

Solution Strengths, Weaknesses and Critical Indicators

Anaerobic Digestion:

  • Long usable life and can be run reliably
  • Creates energy and generates environmental credits
  • Proper feeding & system monitoring is required to avoid system downtime
  • Proven technology for odor control
  • Proven technology for GHG reduction
  • Proven technology for pathogen reduction
  • Different types of systems produce varying gas production rates
  • Requires proper preparation of the feedstock
  • Requires other technologies for energy utilization
  • Requires other technologies for digestate handling
  • Requires other technologies to prevent nitrogen loss
  • Complex systems may require expertise not available on-farm

Newtrient Comments/Opinions:

Anaerobic Digester technology:

  • Is proven technology for odor, GHG and pathogen reduction and energy production
  • Has a long usable life and can be run reliably
  • Require proper preparation of the feedstock
  • Usually requires other technologies for energy utilization
  • Usually requires other technologies for digestate handling
  • Proper feeding & system monitoring is required to avoid system downtime
Maas Energy has made significant inroads in California by providing the dairies there with a manure management system based on covered lagoon digesters. The systems have been installed with engine generators for electrical production and they have a digester cluster project near Pixley, California that will bring together 11 digesters in a cluster to upgrade the biogas to pipeline standards and inject it into the natural gas grid as renewable natural gas.

Maas Energy has been awarded multiple grants by the California Department of Food and Agriculture and currently has 14 operating digesters and 38 projects under development.

Newtrient 9-Point Scoring Rating

View the Scoring Page

Disclaimer: Newtrient has collected the information and photographs on this page from public sources including the vendor’s website and promotional material in accordance with Section 107 of the Copyright Act 1976, allowance for "fair use". All vendor product and company names are trademarks™, registered trademarks® and/or trade names of the respective vendors or their licensors. Unless otherwise noted, Newtrient is not associated, connected or affiliated with, or sponsored or endorsed by, any vendor or licensor of such trademarks and trade names. See Terms of Use for details.