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Climate-tech startups can fund research and development through competitive grants, private investment, or a combination of both. U.S. Department of Energy (DOE) and National Science Foundation (NSF) SBIR/STTR programs are potential non-dilutive routes for eligible U.S. small businesses; angel and venture-capital rounds provide capital in exchange for ownership. The right fit depends on your location, company structure, technology, stage, timelines, and the live program or financing terms.
What are the main funding options?
For a climate-tech startup, the central distinction is whether funding costs the company ownership, requires repayment, or comes with specific project obligations. A grant is generally not repaid in money or equity when the recipient meets its contractual conditions. An equity investment sells a portion of the company. Loans and convertible instruments have different repayment or conversion terms and should not be treated as grants.
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| Funding route | Ownership and repayment | What to examine |
|---|---|---|
| Competitive grant, such as eligible U.S. SBIR/STTR funding | Generally non-dilutive and not repaid in money if award conditions are met; obligations are set by the award. | Eligibility, allowable work, milestones, cost sharing, reporting, IP terms, review schedule, and award timing. |
| Angel or venture-capital equity | Investors receive ownership; existing holders are diluted. | Valuation, ownership sold, capitalization, governance and other negotiated financing terms. |
| Loan or convertible instrument | Repayment or potential conversion may apply, depending on the instrument. | Interest, repayment schedule, security, conversion triggers, maturity, and other contract terms. |
The OECD describes dilutive funding as financing in which a company gives up part of its ownership, including by selling shares to angel investors or venture capitalists. A grant may avoid that ownership cost, but its conditions can limit what the money can fund and when it can be used. OECD, Financing Start-ups and SMEs in ASEAN.
How do DOE and NSF SBIR/STTR grants work?
DOE: phased support for eligible U.S. small businesses
DOE describes its Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) programs as competitive, non-dilutive funding for eligible American small businesses developing technologies with commercial potential. The phases are designed to move work from feasibility toward development and commercialization:
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- Phase I: Test feasibility and establish whether the proposed technical work merits further development.
- Phase II: Develop the technology and build or test prototypes.
- Phase III: Pursue commercialization or follow-on activity; it is not simply another guaranteed grant phase.
Eligibility and available topics are program-specific and tied to Small Business Administration (SBA) requirements. The SBA policy directive requires participating agencies to use competitive, merit-based selection procedures. It also says agencies may not use venture-capital or private-equity investment as an SBIR/STTR award criterion. That does not establish that every ownership structure qualifies: the applicable program’s ownership, control, size, and other requirements still matter. SBA, SBIR/STTR Policy Directive.
DOE’s SBIR/STTR page, accessed October 4, 2026, said its FY26 Genesis Mission Phase I submissions had closed and that a broader Phase I opportunity was expected later in fall 2026. The same page described approximately $147 million in FY25 Phase II opportunities opened July 22, 2026. That $147 million is an opportunity total, not an individual award, and those page notices do not establish that an application is currently open. Check DOE’s live opportunity information and solicitation before planning around dates or amounts. DOE SBIR/STTR Funding Opportunities.
NSF: early-stage R&D with no equity taken
NSF’s America’s Seed Fund supports high-risk technology development across markets, including energy. NSF says the program takes no equity and awardees retain ownership of their company and intellectual property. The current solicitation and award documents govern the specific opportunity, including any obligations and eligibility rules.
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NSF’s program page states that America’s Seed Fund offers up to $2 million in seed funding. Separately, funding opportunity NSF 26-510 lists an anticipated standard Phase I grant of up to $305,000. These figures describe different program pages and stages; neither should be read as a guaranteed award or a universal NSF grant cap. Confirm the current solicitation for the opportunity you are considering. NSF America’s Seed Fund; NSF funding opportunity NSF 26-510.
What other DOE commercialization routes are worth investigating?
A conventional grant solicitation is not the only public-sector route DOE identifies for advancing energy technologies. Its commercialization resources point to the Energy Program for Innovation Clusters, Technology Commercialization Fund, Lab-Embedded Entrepreneurship Program, and collaboration with National Laboratories. Depending on the pathway, support may include non-dilutive capital or cost-share agreements. These are options to investigate, not guaranteed funding; check each program’s current eligibility and terms. DOE, Technology Commercialization.
DOE’s Hydropower and Hydrokinetic Office page gives one example of how award amounts and eligibility can vary by program: it describes Phase I grants of $200,000 for up to 12 months and Phase II grants of $1.1 million to $1.6 million over two years. Those are program-specific figures, not general DOE SBIR/STTR amounts; verify them against the active notice. The page also illustrates that some opportunities have detailed ownership, employee-count, and work-share conditions, including limits involving ownership by venture-capital, hedge-fund, or private-equity firms. DOE, Hydropower and Hydrokinetic Office.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How does dilution work?
Dilution occurs when a company issues or sells ownership to investors, reducing the percentage held by existing shareholders. For example, if founders own all of a company before an equity financing, the investors’ newly issued shares mean the founders own a smaller percentage afterward. Their percentage changes; the value of their stake does not necessarily fall, because valuation and company prospects also matter.
There is no universal climate-tech dilution percentage, standard valuation, or round size established for all startups. The impact depends on the negotiated financing terms and the company’s capitalization. Review the proposed investment against a fully diluted ownership model, including existing shares, options, and any convertible instruments, and get advice on the documents before signing.
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How should you choose between a grant and private investment?
Compare the options against the work you need funded and the business milestone that money should unlock. A grant may suit bounded R&D with measurable technical deliverables; equity may offer capital for broader company needs, but at an ownership cost. A startup can also use public support alongside private investment: DOE describes grants and national-laboratory collaboration as ways to advance technologies toward later private capital and market adoption.
- Eligibility and fit: Confirm geography, company ownership and control, employee size, technical topic, stage, and any research-partner requirement.
- Permitted use and milestones: Check which costs are allowable, what technical deliverables are required, whether cost sharing applies, and what phase gates or follow-on expectations exist.
- Timing and runway: Compare application windows, review processes, expected award timing, and the work required to apply with the company’s cash runway. Federal grants are competitive, and dates change.
- Ownership, IP, and reporting: Compare grant-specific rights and reporting obligations with the equity, governance, and other terms in an investment agreement. NSF’s stated ownership position is not a substitute for checking a particular award’s documents.
- Strategic value: Ask whether the funding de-risks a technical milestone, helps validate the technology, supports commercialization, or makes the company more ready for later capital.
Use the live solicitation or executed financing documents—not a general program description—as the final authority. Program rules and investor terms vary by geography, company, technology, stage, and opportunity.
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