Grants & Funding for Clean Energy and Sustainability
Clean energy and sustainability is one of the most heavily funded areas in the federal government right now, spanning the Department of Energy, USDA, the EPA, and small-business research programs. Both established businesses and early-stage innovators can find a fit.
Funding ranges from rural energy installation grants to multi-phase research awards for breakthrough technology. The right program depends on whether you are deploying proven technology or developing something new.
Below are the leading programs, how to choose between them, and the energy and sustainability listings currently in our database.
Key Programs to Know
Rural Energy for America Program (REAP)
USDA Rural Development
Grants and guaranteed loans for rural small businesses and farms installing renewable energy systems or improving energy efficiency.
Visit official program page →SBIR / STTR (Clean Energy)
Dept. of Energy & other agencies
Phased research grants (Phase I feasibility, Phase II development) for small businesses commercializing innovative energy and climate technology. These are non-dilutive cash awards.
Visit official program page →DOE Funding Opportunities
U.S. Department of Energy
Competitive funding opportunity announcements (FOAs) across solar, wind, storage, hydrogen, manufacturing, and efficiency, posted regularly throughout the year.
Visit official program page →Choosing the Right Clean Energy Program
- 1
Deploying proven technology (e.g., installing solar)? Look at USDA REAP and state energy-office incentives.
- 2
Developing new technology? Target SBIR/STTR Phase I, then Phase II.
- 3
Confirm small-business size standards and (for REAP) rural location requirements.
- 4
Register in SAM.gov and, for research grants, set up Grants.gov and agency portals early.
- 5
Read the specific funding opportunity announcement carefully — energy FOAs have strict technical scopes.
Insider Tips
- ✓SBIR/STTR awards are non-dilutive — you keep your equity while funding R&D.
- ✓Energy funding opportunities open and close on rolling schedules; check back often or save the ones that fit.
- ✓Pair a federal award with state energy-office incentives and utility rebates to stretch your budget.
Clean Energy & Sustainability Projects: Opportunities in Our Database
Frequently Asked Questions
What's the easiest clean energy grant to get?
For rural businesses and farms installing renewable systems, USDA's REAP is among the most accessible. For technology developers, SBIR/STTR Phase I is the standard entry point, though it is competitive.
Are SBIR/STTR awards grants or loans?
They are non-dilutive grants/contracts — you do not repay them and you do not give up equity. Phase I funds feasibility; Phase II funds further development.
Can existing businesses apply, or only startups?
Both. Deployment programs like REAP serve established businesses and farms, while SBIR/STTR is open to any qualifying small business, including early-stage startups.
Explore more funding
GrantPlain is an independent directory and is not affiliated with any government agency. Always confirm eligibility and certification requirements on the official program pages linked above. Government grant and certification programs never charge a fee to apply.