Best Climate Tech Stocks in 2026: Ranked by Ziggma Stock Score

Uli Ebensperger By Uli Ebensperger

Last Update: 10 September 2026

Best climate tech stocks 2026, ranked by Ziggma Stock Score


The best climate tech stocks for 2026, according to the Ziggma Stock Score, are Nextpower (NXT), First Solar (FSLR), American Superconductor (AMSC), GE Vernova (GEV), Tesla (TSLA), Trane Technologies (TT), Xylem (XYL), Ormat Technologies (ORA), Bloom Energy (BE), and Shoals Technologies (SHLS). The Ziggma Stock Score rates fundamental quality from 0 to 100. Nextpower leads with a Ziggma Stock Score of 99 and a Profound impact rating. Seven of the ten earn a Positive or better impact rating.

A climate tech stock is a company whose core product is technology that cuts emissions or helps adapt to a warming climate. Examples on this list include Nextpower's solar trackers, First Solar's cadmium telluride thin-film panels, and American Superconductor's grid power electronics. The list also covers Bloom Energy's solid oxide fuel cells, Ormat Technologies' geothermal plants, Trane Technologies' heat pumps, and Xylem's water technology. Technology is what separates these companies from utilities that buy or build renewable capacity.Xylem also appears on Ziggma's list of the best water stocks.

The Ziggma Stock Score is built on Growth, Valuation, Profitability, and Financial Health. It measures the business, not the climate story. Each stock also shows its impact rating. Investors can weigh returns and impact side by side.

Key Takeaways

01

The Ziggma Stock Score measures the business, not the theme. A company can lead a climate tech category and still have a weak balance sheet. See how the Ziggma Stock Score is built.

02

This list ranks climate technology, not corporate responsibility. A company can build technology that cuts emissions and still earn a Negative impact rating. American Superconductor is the example on this list. Read more on the climate impact of investments.

03

Seven of the ten earn a Positive or better impact rating. Nextpower leads with a Profound rating. Tesla and Shoals Technologies carry Mixed ratings. American Superconductor carries a Negative rating.

04

The energy transition rewards the whole value chain. This list spans solar (NXT, FSLR, SHLS), grid electrification (AMSC, GEV), heat pumps (TT), water technology (XYL), geothermal (ORA), fuel cells (BE), and EVs with battery storage (TSLA). That breadth is the basis of a diversified sustainable portfolio.

Why climate tech stocks, and why now

The energy transition is the largest capital reallocation in modern economic history. Global renewable energy investment surpassed fossil fuel investment for the first time in 2024. That shift is now self-reinforcing.

AI data centers are creating unprecedented demand for clean, reliable power around the clock. Baseload sources — nuclear, geothermal, fuel cells — are attracting capital that intermittent solar and wind alone cannot satisfy. That tailwind runs directly through GE Vernova, NextEra Energy, and Bloom Energy.

The One Big Beautiful Bill Act, signed in July 2025, rolled back much of the Inflation Reduction Act. The 45X advanced manufacturing credit survived, with new restrictions on Chinese-linked suppliers. First Solar's US production footprint was built for exactly this policy environment. The commercial EV credit that covered Rivian's Electric Delivery Vans, built in Normal, Illinois, ended for vehicles acquired after September 30, 2025.

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Weak earnings, thin margins, and heavy debt lower a company's Ziggma Stock Score, whatever its climate credentials. Not every company in the right sector is a good investment.

The stocks below cleared both bars: financial quality as measured by the Ziggma Stock Score, and climate credibility as assessed by ACA Ethos. That combination is rarer than the number of climate tech funds might suggest.

How this list was built

34 climate tech stocks were screened from the Ziggma universe across six subsectors: solar, EVs and charging infrastructure, grid infrastructure, geothermal, hydrogen and fuel cells, and renewables utilities.

Fundamentals are measured by the Ziggma Stock Score, from 0 to 100. The Ziggma Stock Score is built on Growth, Valuation, Profitability, and Financial Health. The ten companies are ranked by Ziggma Stock Score.

Each company also shows its impact rating. Ties are broken by impact rating. GE Vernova ranks above Tesla at 89 on its Positive impact rating.

Tesla also appears on Ziggma's list of the best EV stocks, which ranks the companies whose revenue depends on electric vehicle adoption.

This list ranks the best climate tech companies. It does not rank the most responsible or sustainable companies. A company can build technology that cuts emissions and still earn a weak rating for its own practices. The impact rating shows that side, so investors can weigh both.

Data is as of September 2026. Ziggma Stock Scores update continuously. Impact ratings are reviewed periodically. Rankings may change as underlying data is refreshed.

Selection
Climate tech solutions, then fundamentals
Ranking Metric
Ziggma Stock Score (0–100)
Also Shown
Impact rating
Stocks
10 US-listed companies
Data as of
September 2026
1

Nextpower (NASDAQ: NXT): solar tracker maker with the highest impact rating on this list

Profound Impact

Nextpower makes solar trackers, which tilt utility-scale solar panels to follow the sun through the day. Trackers raise a solar farm's output compared with fixed mounts, so a developer gets more electricity from the same land and the same panels. That gain is why trackers are standard on large US solar projects. Nextpower has expanded beyond trackers into the electrical systems that connect a solar plant to the grid, along with software that controls how the trackers move. The company sells to project developers rather than to homeowners, which ties its order book to the utility-scale buildout. Its Profound impact rating is the highest on this list.

Compare the top US solar companies
99
Ziggma
Score
2

First Solar (NASDAQ: FSLR): largest US-headquartered solar panel manufacturer

Positive Impact

First Solar makes cadmium telluride thin-film panels, a different technology from the crystalline silicon panels most competitors sell. Thin-film panels use no polysilicon, so First Solar sits outside the Chinese-dominated polysilicon supply chain that constrains much of the industry. The company manufactures in Ohio, Alabama, and Louisiana, and US production qualifies it for the 45X advanced manufacturing tax credit. First Solar sells almost entirely to utility-scale projects and books orders years ahead, which gives it unusual visibility on future revenue for a manufacturer. Its Positive impact rating and Ziggma Stock Score of 98 put it second on this list.

See all top-rated climate stocks for 2026
98
Ziggma
Score
3

American Superconductor (NASDAQ: AMSC): grid power electronics for renewable-heavy networks

Negative Impact

American Superconductor builds the power electronics that keep renewable-heavy grids stable. Wind and solar farms produce power that rises and falls with the weather, and that variability can push grid voltage outside safe limits. American Superconductor's D-VAR systems regulate voltage at the point of connection, so a project can connect without destabilizing the network around it. Grid products generate most of the company's revenue. Its Wind business designs the electrical control systems inside wind turbines. American Superconductor earns a Negative impact rating. That rating grades the whole company, not its grid technology, and it makes this list on what its technology enables.

Understand the climate impact of your investments
91
Ziggma
Score
4

GE Vernova (NYSE: GEV): grid electrification and wind energy equipment

Positive Impact

GE Vernova builds equipment for power generation, grid electrification, and wind energy. Its Electrification segment supplies transformers, switchgear, and grid software, the hardware that moves electricity from where it is generated to where it is used. Aging grids and new data center load have made that equipment scarce, and lead times for large transformers now run years. Its Power segment, led by gas turbines, is the largest part of the company by revenue, so GE Vernova is not a pure climate tech play. It makes this list on its grid and wind technology, and it earns a Positive impact rating.

See the best renewable energy stocks
89
Ziggma
Score
5

Tesla (NASDAQ: TSLA): electric vehicles and grid-scale battery storage

Mixed Impact

Tesla makes electric vehicles and two battery storage systems: Megapack for utilities and Powerwall for homes. The storage business is the part that matters most for the energy transition, because batteries let a grid store solar output during the day and release it after dark. Energy storage is a small but growing share of Tesla's revenue, and it carries higher margins than the vehicle business. Tesla's Mixed impact rating reflects scrutiny of labor and governance practices rather than its products. Product-level climate benefit and company-level impact are measured separately, and Tesla is the clearest case of the two pulling in different directions.

See how Ziggma's impact data works
89
Ziggma
Score
6

Trane Technologies (NYSE: TT): heat pumps and high-efficiency building systems

Positive Impact

Trane Technologies makes heating, ventilation, and air conditioning systems, including heat pumps. Heating buildings is one of the largest uses of fossil fuel in the economy, and a heat pump replaces a gas or oil boiler with equipment that runs on electricity. Every boiler swapped for a heat pump moves a building's heating onto the grid, where it can be supplied by renewables. Trane also makes thermal management systems that cool data centers and refrigeration units for transport. The company is listed on the NYSE and incorporated in Ireland, with its US headquarters in Davidson, North Carolina.

88
Ziggma
Score
7

Xylem (NYSE: XYL): water technology and climate adaptation

Positive Impact

Xylem makes pumps, water treatment systems, and smart water meters. It is the climate adaptation pick on this list: its technology helps water utilities cope with drought, flooding, and leaking networks rather than cutting emissions directly. Leak detection is the clearest example, because a large share of treated water is lost in distribution before it reaches a tap. Finding those leaks saves water and the electricity used to move it. Moving water is itself one of the biggest power draws for many municipalities, so energy-efficient pumps cut utility emissions as well as bills. Xylem earns a Positive impact rating.

Explore the best sustainable stocks
80
Ziggma
Score
8

Ormat Technologies (NYSE: ORA): geothermal power equipment and plants

Positive Impact

Ormat Technologies designs and builds its own geothermal power equipment, then owns and operates the plants that equipment goes into. That combination is unusual and is the reason Ormat counts as climate tech rather than as a power producer. Geothermal generates electricity around the clock, whatever the weather, which makes it a complement to solar and wind rather than a competitor. Round-the-clock output has drawn interest from data center operators that need firm power. Ormat also develops battery storage projects in the US, and it earns a Positive impact rating.

70
Ziggma
Score
9

Bloom Energy (NYSE: BE): solid oxide fuel cells for on-site power

Positive Impact

Bloom Energy makes solid oxide fuel cells that generate electricity on site, at the building or campus that uses the power. Data centers have become the main customer, because connecting a large new site to the grid can take years and fuel cells sidestep that queue. The cells convert fuel to electricity electrochemically rather than by burning it, which is more efficient than on-site combustion. They run mainly on natural gas today and can also run on biogas or hydrogen, so the emissions benefit depends on what is fed into them. Bloom Energy earns a Positive impact rating.

69
Ziggma
Score
10

Shoals Technologies (NASDAQ: SHLS): electrical systems for utility-scale solar

Mixed Impact

Shoals Technologies makes the electrical balance-of-system components that connect solar panels and batteries to the grid. Its wiring harnesses, combiner boxes, and connectors are the unglamorous parts of a solar farm, and they are a large share of what actually gets installed on site. Shoals designs them to plug together, which cuts the hours of skilled electrical labor a project needs. Labor is one of the few solar costs that has not fallen, so that saving matters to developers. Shoals is a pure play on solar and storage buildouts, and it earns a Mixed impact rating.

67
Ziggma
Score

The bottom line on climate tech stocks for 2026

The strongest climate tech stocks combine technology the energy transition needs with a business that can fund its own growth. A compelling climate story is not enough on its own. Earnings, margins, and balance sheets decide which companies turn good technology into lasting returns.

The Ziggma Stock Score measures those fundamentals from 0 to 100. The impact rating adds a second view: how each company affects people and the planet. The two views don't always agree, and investors can weigh them for themselves.

Climate tech spans solar, grid electrification, heat pumps, water technology, geothermal power, fuel cells, and battery storage. That breadth lets investors spread exposure across the energy transition rather than bet on one technology.

Scores change as companies report new results, so check current data before investing. This article is for information only and is not investment advice.

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FAQ

What is a climate tech stock?
A climate tech stock is a company whose core product is technology that cuts emissions or helps adapt to a warming climate. Examples include Nextpower's solar trackers, American Superconductor's grid power electronics, and Trane Technologies' heat pumps. Climate tech is narrower than climate stocks, which also include companies that cut their own emissions. For the broader view, see the best climate stocks for 2026.
Why aren't all climate tech companies on this list?
Strong technology does not guarantee a strong business. Each company on this list also shows strong fundamentals on the Ziggma Stock Score. The Ziggma Stock Score rates Growth, Valuation, Profitability, and Financial Health from 0 to 100. Companies with weak earnings, thin margins, or heavy debt don't make the cut. Learn how the Ziggma Stock Score works.
What do the impact ratings on this list mean?
The impact rating measures a company's real-world impact on people and the planet. It is not an ESG rating, which measures financial risk to the company. Ratings fall into five bands: Profound, Positive, Mixed, Negative, and Harmful. Seven of the ten stocks on this list earn a Positive or better rating. Learn how to read an ESG rating and why it answers a different question.
Why is American Superconductor (AMSC) on the list despite a Negative impact rating?
American Superconductor makes this list on its grid technology. Its power electronics keep renewable-heavy grids stable. This list ranks the best climate tech companies, not the most responsible or sustainable ones. The Negative rating grades the whole company, not its technology. Read more on the climate impact of investments.
How is climate tech different from renewable energy utilities?
Climate tech companies build the technology behind the energy transition. Renewable energy utilities generate and sell power, often from a mix of renewables and fossil fuels. This list covers technology makers such as Nextpower, First Solar, and Bloom Energy. For generators and utilities, see the best renewable energy stocks for 2026.
Is Nextpower (NXT) the best climate tech stock to buy?
Nextpower ranks first on this list, with a Ziggma Stock Score of 99 and a Profound impact rating. Its solar trackers raise the output of utility-scale solar farms. Whether it suits an individual investor depends on portfolio context, risk tolerance, and entry price. This article is not investment advice. See how any stock fits your holdings with a Portfolio Checkup.
Why does Tesla have a Mixed impact rating despite being an EV company?
Tesla's Mixed impact rating reflects factors beyond its products. The rating covers Climate Action, Resource Use, Fair Labor, and Accountability. Tesla has faced scrutiny over working conditions and governance practices. Product-level climate benefit is distinct from company-level impact. Learn how Ziggma's impact data works.
How does geothermal compare to solar and wind as a climate investment?
Geothermal generates electricity around the clock, whatever the weather, unlike solar or wind. Ormat Technologies is the only geothermal company on this list. It designs and builds its own geothermal power equipment and operates its own plants. Explore more in the best sustainable stocks.
Why is a water technology company like Xylem on a climate tech list?
Xylem is on this list as a climate adaptation company. Its pumps, treatment systems, and smart meters help water utilities manage drought, flooding, and leaks. Climate tech covers adaptation as well as emissions cuts. Find similar companies with the Ziggma stock screener.
Does climate tech still get federal policy support?
Some support remains after the One Big Beautiful Bill Act, signed in July 2025. The 45X advanced manufacturing credit survived, with new restrictions on Chinese-linked suppliers. New wind and solar projects had to start construction by July 2026 or be placed in service by the end of 2027 to qualify for credits. The commercial EV credit ended for vehicles acquired after September 30, 2025. For the solar detail, see the best solar stocks for 2026.