The Allam-Fetvedt Cycle

Affordable Energy now means zero-emissions.

8 Rivers has developed the Allam-Fetvedt Cycle, a technology that will enable the world to meet its climate targets without paying more for electricity. The Allam-Fetvedt Cycle is a new way to generate low-cost power from carbon-based fuels without producing air emissions.

Affordable energy now means zero emissions. The Allam-Fetvedt Cycle is reinventing emissions capture from its source.

About the project:

The future of our planet – considering a rapidly growing global population – demands a balanced portfolio of renewables and carbon-based methods of power generation, particularly those employing carbon capture. Free emissions capture is the holy grail of carbon-based power generation. Today, power cycles require the addition of expensive, efficiency-reducing equipment to decrease and capture emissions. The Allam-Fetvedt Cycle is a new type of power cycle that takes a novel approach to emissions reduction. It uses the oxy-combustion of carbon fuels and a high-pressure supercritical CO2 working fluid in a highly recuperated cycle that captures all emissions by design. The only by-products are liquid water and a stream of high-purity, pipeline-ready CO2. The cycle can utilize a variety of carbon-based fuels, including natural gas and gasified solid fuels such as biomass and municipal solid waste. The Allam-Fetvedt Cycle embodies major advantages over conventional systems: attaining high efficiencies at low costs with low to no water consumption. All this with full, free emissions capture. The Allam-Fetvedt Cycle powered by natural gas is exclusively licensed to NET Power, LLC. NET Power is leading the commercialization of the natural gas version of the cycle, and 8 Rivers is a shareholder in NET Power.


In order to meet the world’s carbon targets, we must develop cost-effective technology to eliminate CO2 emissions from carbon-based fuels.


An entirely new power cycle that generates emissions-free electricity from carbon-based fuels for lower costs than traditional, emitting technologies.

Key Innovation

Using high pressure CO2, instead of steam, as the system working fluid.



NET Power deployed its demonstration facility in LaPorte, Texas. Several NET Power commercial projects are currently in development, including some by 8 Rivers. Separately, progress of the solid-fuels system is also underway with ongoing engineering and combustor testing.

Low Cost

The Allam-Fetvedt Cycle produces lower cost electricity than traditional power systems that do not capture air emissions.

No Air Emissions

The Allam-Fetvedt Cycle inherently eliminates air emissions as a function of how it most-efficiently operates. The only byproducts are liquid water and pipeline-ready CO2.

No Water Use

For a smaller efficiency reduction than traditional power plants, the Allam-Fetvedt Cycle can use air to cool, eliminating all water usage.

Platform Technology

The Allam-Fetvedt Cycle can be applied to a variety of fuels and fuel sources – including natural gas, biomass, and solar – and integrates with many industrial process.

Project Whitetail

NET Power plant being developed in partnership with Sembcorp at the Wilton industrial site in Teesside, UK

Project Coyote

NET Power plant being developed in partnership with the Southern Ute Growth Fund in Colorado