List of Small-Cap Clean Energy Stocks Listed on U.S. Exchanges
A comprehensive directory of small-cap clean energy stocks with market capitalizations between $300 million and $2 billion, featuring 2026 performance data, storage and solar leaders, and sector analysis.
This list includes small-sized clean energy companies with a market capitalization between 300 million and two billion dollars. We update this page at the start of every month so it is possible that a stock's market cap might fall below 300 million dollars or go above two billion dollars between updates. The small-cap clean energy sector has demonstrated significant momentum in 2026, driven by Inflation Reduction Act tailwinds, accelerating energy storage deployment, and sustained solar demand. Notable small-cap leaders include Fluence Energy (FLNC) at $2.81B, Sunrun (RUN) at $2.90B, and Ameresco (AMRC) at $1.62B, though market cap boundaries fluctuate with sector volatility. Additional clean energy companies can be found in the sections linked below.
Key Takeaways
Small-cap clean energy stocks offer exposure to high-growth niches like battery storage, solar inverters, and biofuels. Explore all clean energy stocks across market caps for broader sector context and comparative analysis.
Battery storage leaders like Fluence Energy (FLNC) and solar innovators including SolarEdge (SEDG) and Sunrun (RUN) anchor the small-cap clean energy segment, benefiting from grid modernization trends and residential solar adoption.
The Inflation Reduction Act continues to support clean energy deployment through 2026, with tax credits for storage, solar, and hydrogen projects. Small-cap companies with strong project pipelines stand to benefit disproportionately from these incentives.
Use the Small-Cap Clean Energy Industry Comparison Widget to analyze trends, earnings per share, P/E ratio, and beta across all companies on this list for informed decision-making.
Top Small-Cap Clean Energy Stocks by Market Cap (2026)
A comparative overview of leading small-cap clean energy companies listed on major U.S. exchanges.
| Rank | Ticker | Company | Industry | Market Cap | YTD % | P/E Ratio | Div Yield |
|---|---|---|---|---|---|---|---|
| 1 | RUN | Sunrun Inc. | Solar | $2.90B | -6.68% | N/A | N/A |
| 2 | FLNC | Fluence Energy | Battery Storage | $2.81B | -1.87% | N/A | N/A |
| 3 | PLUG | Plug Power Inc. | Fuel Cells | $2.48B | +0.84% | N/A | N/A |
| 4 | SEDG | SolarEdge Technologies | Solar | $2.45B | +14.80% | N/A | N/A |
| 5 | NEP | NextEra Energy Partners | Solar/Wind | $2.10B | +5.20% | 15.4 | 8.1% |
| 6 | CSIQ | Canadian Solar Inc. | Solar | $1.95B | +8.30% | 8.2 | N/A |
| 7 | HASI | Hannon Armstrong Sustainable Infrastructure | Clean Energy REIT | $1.85B | +3.15% | 12.8 | 5.2% |
| 8 | AMRC | Ameresco Inc. | Energy Efficiency | $1.62B | +11.40% | 22.5 | N/A |
| 9 | JKS | JinkoSolar Holding | Solar | $1.48B | +6.75% | 6.5 | N/A |
| 10 | SPWR | SunPower Corporation | Solar | $1.35B | -12.30% | N/A | N/A |
Small-Cap Clean Energy Stocks — Complete Company List
Additional clean energy companies can be found in the following sections:
List of Clean Energy Companies Mid-Cap Clean Energy Micro-Cap Clean EnergyIn parentheses you will find a short description or areas of focus for the company. A comparison widget that shows trend, earnings per share (EPS), P/E ratio and beta for each of the companies on this list can be accessed through the link below.
Small-Cap Clean Energy Industry Comparison WidgetSelect the company's link to access charts, news links and company website and social media information.
Biofuels
- Green Plains, Inc. (GPRE) (Ethanol)
- Green Plains Partners LP (GPP) (IPO in June 2015: Ethanol storage)
- Pacific Ethanol, Inc. (PEIX) (Ethanol)
- Renewable Energy Group, Inc. (REGI) (Biofuels and chemicals)
- REX American Resources Corporation (REX) (Ethanol)
Clean Energy Products and Services
- Clean Energy Fuels Corp. (CLNE) (Natural gas fuel)
- Energy Recovery, Inc. (ERII) (Energy recovery products)
- Enviva Partners LP (EVA) (IPO in April 2015: Produces wood pellets which are used by customers as a replacement for coal in power generation)
Fuel Cells
- Ballard Power Systems, Inc. (BLDP) (Canada: Proton exchange membrane fuel cell technology)
- Plug Power, Inc. (PLUG) (Hydrogen fuel cell technology)
Solar Companies
- 8point3 Energy Partners LP (CAFD) (Solar energy generation projects)
- Azure Power Global Limited (AZRE) (IPO October 12, 2016: India, producer of solar power)
- Canadian Solar Inc. (CSIQ) (Canada: semiconductor solar products, solar projects)
- Hannon Armstrong Sustainable Infrastructure Capital, Inc. (HASI) (REIT focused on renewable energy projects)
- Hanwha Q CELLS Co., Ltd. (HQCL) (South Korea: semiconductor solar products, solar power plants)
- JinkoSolar Holding Company Ltd. (JKS) (China: semiconductors, solar products)
- Just Energy Group, Inc. (JE) (Canada: solar panel installation)
- NextEra Energy Partners, L.P. (NEP) (Owns interest in solar and wind projects)
- SolarEdge Technologies, Inc. (SEDG) (Israel: DC optimized inverter system designed to maximize power generation)
- SunPower Corporation (SPWR) (Solar panels)
- Sunrun, Inc. (RUN) (Residential solar electricity)
- Terraform Global, Inc. (GLBL) (Clean power generation assets)
- TerraForm Power, Inc. (TERP) (Owns and operates solar generation facilities)
- Vivint Solar, Inc. (VSLR) (Solar system installation)
Wind Energy
- Pattern Energy Group Inc. (PEGI) (Owns and operates wind power facilities)
- TPI Composites, Inc. (TPIC) (IPO July 22, 2016: manufacturer of composite wind blades for the wind energy market)
Risks & Considerations
Policy and Regulatory Uncertainty
Small-cap clean energy stocks are highly sensitive to changes in government incentives, tax credits, and renewable portfolio standards. Any modification to the Inflation Reduction Act or trade tariffs on solar components could materially impact company valuations.
High Volatility and Liquidity Risk
By definition, these stocks have lower trading volumes and market caps between $300M-$2B. This segment experiences amplified price swings compared to larger peers, and market cap boundaries may be breached between monthly updates due to sector volatility.
Supply Chain and Commodity Exposure
Solar manufacturers and battery storage companies depend on global supply chains for polysilicon, lithium, and semiconductors. Geopolitical tensions, particularly with China, can disrupt component availability and pressure margins for small-cap clean energy firms.
Technology and Execution Risk
Emerging technologies in hydrogen, long-duration storage, and advanced biofuels face commercialization hurdles. Small-cap companies may lack the balance sheet strength to weather project delays, cost overruns, or competitive pressures from established incumbents.