On September 8, 2023, Evergreen Energy, Inc. went out of business as per its Chapter 7 liquidation filing under bankruptcy. Evergreen Energy Inc. operates as a cleaner coal technology, energy production, and environmental solutions company in the United States. It operates two clean energy business units that own two proprietary technologies: K-Fuel, and the GreenCert suite of software and services. The company provides K-Fuel, a clean coal technology, which improves the performance of low-rank sub-bituminous and brown coals and lignite yielding higher efficiency by applying heat and pressure to low-rank coals to reduce moisture. It also offers the GreenCert software suite, which provides power generators with operational intelligence analytics that identify fuel and operational efficiency opportunities, and address new regulatory pressures regarding environmental emissions. The K-Fuel and GreenCert technologies offer business and environmental solutions for energy production and generation industries and processes. Evergreen Energy Inc. was founded in 1981 and is headquartered in Denver, Colorado.