There are over 25 companies worldwide that are developing Stirling engines. Links to selected companies are listed below:
Kockums (http://www.kockums.se/) of Sweden has developed a 25-kW Stirling engine.
Stirling Energy Systems, Inc. (http://www.stirlingenergy.com) of Phoenix, Arizona, plans to install roughly 40,000 modular 25-kW dish-Stirling systems per year in Arizona and Nevada, using the 25-kW 4-95 Stirling engine developed by Kockums of Sweden.
Stirling Technology Company (http://www.stirlingtech.com) of Kennewick, Washington, is focusing its business on Stirling engine generators ranging from 55 to 3,000 watts.
Stirling Technology, Inc. (http://www.stirling-tech.com) of Athens, Ohio, has developed a 5-hp Stirling engine (the ST-5) for stand-alone operation in rural areas that can run on a range of fuels, such as impure natural gas, crude oil, and bio-mass.
Sunpower, Inc. (http://www.sunpower.com) of Athens, Ohio, is developing BioWatt™, a line of cogeneration systems for heat and power that will use a free-piston Stirling engine to convert various wood fuels (such as wood, wood pellets, sawdust, chips, and biomass waste) to alternating electricity and useful heat in residential, small commercial, and agricultural applications.
WhisperTech Ltd (http://www.whispergen.com) of New Zealand, has developed the WhisperGen, a cogeneration system based on the Stirling engine, and that is capable of producing 750 Watts of electrical output and 5-6kW of thermal output in the form of hot water suitable for water or space heating.