Renewable Energy


With the use of an anaerobic digester, Capstone microturbines are able to cleanly and effectively run on methane gas from landfills, wastewater treatment facilities and food processing facilities, as well as agriculture waste, which is often referred to as “green waste.” Rather than simply venting or flaring the methane gas, Capstone microturbines can convert this free fuel to clean and reliable electricity for use at the site or surrounding areas. Capstone offers its "CR" (Capstone Renewable) line of microturbines specifically designed to operate on waste gas fuels. Capstone microturbines can run on variable methane percentages compared to reciprocating engines.

Broad Suite of Applications

Broad Suite of Applications

  • Wastewater Treatment Plants
  • Farm Digesters
  • Landfills
  • Food Processing Plants

Features & Benefits

  • Patented Air Bearing Technology
    No lubricants or coolants needed
  • One Moving Part
    Minimal maintenance
  • Remote Monitoring
    Complete view at all times
  • Advanced Combustion Controls
    Low emissions with no exhaust aftertreatment
  • High Power Density
    Compact footprint
  • Factory Protection Plan
    5 and 9 year plans available
  • Clean Waste Heat
    Uncontaminated exhaust heat
  • Stand Alone or Grid Connect
    Multiple applications and industries
  • Reliable
    Tens of millions of runtime hours and counting

Case Studies for Renewable Energy


tons of CO2 reduced annually at Cossato Spolina Wastewater Treatment Plant


Energy efficiency exceeded at Revico Wastewater Treatment Plant

Burbank Landfill PDF
Great Neck Water Pollution District PDF
Edar de Lloret de Mar WWTP PDF
CAP Group Water Service PDF
Swineline Farm PDF
Edar de Rubi Rubi, Spain PDF
Sungawa Clean Plaza Kurukuru PDF
Cossato Spolina Wastewater Treatment Plant PDF
Revico Wastewater Treatment Plant PDF
York Wastewater Treatment Plant PDF
View More Case Studies

Application areas

  • Thermal utilization of exhaust gas heat with low pressure loss on the exhaust gas side
  • Integration into modern heating systems
  • Optimization of the annual utilization factor
  • Adaptation to the electricity tariff structure (reduction of peak power, avoidance of operation in off-peak tariff periods)

The microturbines are ideally suited for controlled, decentralized energy supply due to the small power units and the excellent operating characteristics (almost constant efficiency over a wide load spectrum). By using the microturbine in cogeneration, overall efficiencies of up to 86% can be achieved for standard heating systems with temperatures of 60/80°C. Higher efficiencies are possible by optimizing the heat exchanger to the application. For example, we offer a heat exchanger with a thermal capacity of 75kW, achieving an exhaust gas temperature of 65°C. Another possibility results from lowering the operating temperatures or the flow rates, if the heat transfer medium temperature is lowered. Since the microturbine is operated with a lambda of 6-9, the exhaust gas dew point is also very low, so that theoretically exhaust gas temperatures of about 40°C after the heat exchanger are possible without any problems.

The microturbine-specific exhaust gas characteristic with constantly occurring heat at a high temperature level (approx. 300°C) in only one exhaust gas stream is a decisive advantage in direct exhaust gas utilization compared to reciprocating engine-based combined heat and power facilities. The use of oil-free microturbine exhaust gas with oxygen contents of 17 to 18% by volume and very low pollutant concentrations is unproblematic.

The use of microturbines for drying is already being applied in many different industries. These include, among others, the stone and earth industry, paper/cardboard industry, feed industry,...

Another field of application is steam generation, which can be realized with exhaust gas heat exchangers due to the high exhaust gas temperature of the microturbines.

In the field of steam generation by microturbines we closely cooperate with partners like Saacke, Hagelschuer ( or also with the company SKS ( Below you will find an information sheet of a Saacke burner specially developed for the turbines.

Examples of applications in industry include food manufacturers, pet food producers, industrial laundries, breweries and chemical manufacturers.

The advantage of the high exhaust gas temperature is also evident in the connection with an absorption chiller: Hot water temperatures of 80-90°C are necessary for this. The advantage of connecting an absorption refrigeration facility is the increase in the number of annual operating hours of the CHP unit. Thus, the microturbine can be operated in summer as well as in winter with high utilization rates. Such a facility is thus suitable for the base load supply of buildings with a constant demand for electricity, heating and cooling.

The microturbine thus offers the possibility of ensuring the total energy supply of a building by simply coupling an absorption chiller. Such an installation achieves efficiencies of up to 85% and is particularly suitable in:

  • commercial high-rise buildings
  • larger supermarkets
  • hospitals
  • banks
  • event halls
  • commercial units

Cogeneration is based on the simultaneous generation of mechanical energy, which is usually converted directly into electricity, and heat, which can be used directly for refrigeration using sorption technology.

Absorption refrigeration systems are based on a technology introduced by Albert Einstein in 1926. It uses a refrigeration cycle in which the changes of state of the refrigerant water and the absorber lithium bromide reach the temperature parameters of conventional chillers.

Century absorption chillers are LiBr units capable of producing refrigeration down to 6°C and are well suited for use in conjunction with microturbines.

Whether used individually or in conjunction with a Capstone microturbine, Century absorption chillers feature:

  • a tremendous service life of 30 years,
  • tremendous efficiency - 2,000kW cooling with less than 10kW electric,
  • easy handling
  • only a few and easily accessible wearing parts - the units are therefore very low-maintenance
  • 100% ozone friendly, CFC free
  • low noise and low vibration
  • Hot water driven, steam driven or gas fired - the units are available in the power ranges from 35 kW to 5,275 kW and you can choose between a standard product or an individually designed unit.

The Capstone microturbines are operated with

  • Natural gas
  • LPG
  • Diesel/heating oil

Due to its simple design, the turbine is also particularly suitable for use with renewable gases, such as

  • biogas
  • landfill gas
  • sewage gas

In the combustion of biogas, the content of hydrogen sulfide (H2S) is a decisive factor for the service life of the engines or their maintenance requirements. The methane in the biogas reacts in the engine to form water vapor, among other things. This in turn combines with H2S from the biogas to form sulfuric acid (H2SO4). The sulfuric acid is absorbed by the oil film of the cylinder walls and enters the oil circuit. As the bearings are lubricated with this oil, the H2SO4 reaches the bearing surfaces, which suffer faster wear as a result of this chemical load.

Due to their compact design (with integration of compressor, turbine, combustion chamber, recuperator and generator), microturbines are ideally suited for use with lean gases. The only moving component is the high-speed rotor, which integrates the compressor and turbine impellers as well as the generator impeller. Furthermore, no lubricant is required in the Capstone turbine because the rotor is air-bearing. This avoids the corrosion problems associated with internal combustion engines caused by H2S components in the biogas. The manufacturer Capstone states that up to 7 vol-% H2S can be tolerated by the MicroTurbine. In this way, pressures are reduced to a minimum and the service life of the machine is increased. Thus, a turbine achieves a service life of approximately 80,000h compared to 50,000h for engines. When used with biogas, a service life of 40,000h is assumed even for motors.

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We will immediately check the general conditions for an economical use of the microturbine at your site.