How can I get a copy of STG’s application for tax exempt status or most recent federal filings?

As a 501(c)(3) Public Charity, our application for tax exempt status and yearly federal filings are available to the public. This includes Form 1023, IRS ruling letter, and yearly 990s. Please note that this information is available under the name “Solar Turbine Group” for our work in Lesotho (2006-15) and under the name “Solar Turbine Group International” for all work outside of Lesotho and moving forward from October 2015 (when we merged the two organizational structures). The three most recent years are available here for download; older filings are available by request at .

Solar Turbine Group     1023         Ruling     12-13     13-14         14-15    
Solar Turbine Group Int.     1023         Ruling     12-13     13-14         14-15    


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I am part of a group interested in becoming a local manufacturing partner of STG. How do I get more information about starting a partnership?

The focus for this funding cycle is on research and development for the next generation of microgenerator. We will post more information on our website calling for proposals for the subsequent funding cycle, so please keep an eye on the website for more details!

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How can I get involved with STG?

We are always looking for help with administrative functions, funding acquisitions, engineering design, construction, and testing, and partner outreach. At this time, we are primarily looking for volunteers; information on part- and full-time positions opening up at STG will be posted on the website as soon as it becomes available. If you are interested in getting involved in any capacity, please visit our Opportunities page or send us an email at

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How can I contribute to STG? Are you currently taking donations?

Yes, we are currently taking donations! See how you can contribute here.

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