The top climate tech and water tech companies in Israel in 2026 are Tomorrow.io (weather intelligence and satellites), SolarEdge (solar power electronics), ZutaCore (data center cooling), Wint (AI water leak prevention) and H2Pro (green hydrogen). Water and energy efficiency are Israel's deepest strengths. Ten, below.
Israel came to climate tech through necessity: a dry country that recycles nearly 90% of its wastewater, desalinates most of its drinking water and invented modern drip irrigation. That legacy produced a strong water tech sector, and solar, storage and grid companies followed. In 2026 the fastest-growing corner is energy efficiency for AI data centers, where cooling and power have become bottlenecks. This list covers the companies to know as of October 2026, including a few listed ones that anchor the sector.
Built its own satellite constellation to forecast weather better, and sells the insight to businesses.
Tomorrow.io turns weather forecasts into operational decisions for airlines, utilities, logistics companies and governments, and has launched its own radar and microwave satellites to fill gaps in global weather data.
It raised $175 million in early 2026 at a valuation above $1 billion, followed by a further extension.
The Israeli company behind a large share of the world's rooftop solar systems.
SolarEdge's power optimizers and inverters squeeze more energy from each solar panel and allow panel-level monitoring, and it has expanded into home batteries and EV charging.
It went public on Nasdaq in 2015 and, after a hard few years for the solar market, remains the anchor company of Israeli clean energy.
Cools AI chips without water, just as data centers ran out of ways to keep them cool.
ZutaCore's two-phase, direct-on-chip cooling uses a dielectric fluid instead of water, which cuts energy and water use and lets operators pack more GPUs into a rack.
It raised a $100 million Series C in June 2026 at an estimated $600 million valuation, with Samsung, Mitsubishi Electric and Carrier among the investors.
Finds leaks in buildings and construction sites and shuts the water off before the damage.
Wint's AI learns a building's normal water flow, spots leaks and waste, and can automatically cut supply. It sells to commercial real estate, construction firms and insurers, who see it as both a sustainability and a damage-prevention tool.
It raised a $36 million Series D in September 2026.
Splits water into hydrogen without a conventional electrolyzer.
H2Pro's E-TAC technology, which came out of the Technion, separates the steps of water splitting to produce hydrogen more efficiently and at lower cost than standard electrolysis.
It is one of the best-known Israeli bets on making green hydrogen economical.
Stores renewable energy as compressed air in underground tanks.
Augwind's AirBattery stores surplus solar and wind power as compressed air and releases it when needed, and the company also sells energy efficiency systems to industry.
It is listed on the Tel Aviv Stock Exchange.
Turns clean electricity into stored heat that replaces gas in factories.
Brenmiller's bGen system stores energy as heat in crushed rock and delivers steam or hot air on demand, aimed at decarbonizing industrial heat, one of the hardest emissions to cut.
It is listed on Nasdaq and has commercial deployments in Israel and abroad.
Turns unsorted household trash into a material manufacturers can use instead of oil-based plastic.
UBQ converts mixed household waste, including food scraps that would otherwise go to landfill and emit methane, into a thermoplastic that manufacturers blend into products such as pallets and car parts.
Its plant is at Kibbutz Tze'elim in the Negev.
Makes drinking water out of humidity, for disaster zones, homes and offices.
Watergen's atmospheric water generators extract water from the air, from small home units to large systems deployed in emergencies and water-stressed regions.
It is one of the most widely recognized Israeli water brands abroad.
Monitors city sewage networks in real time to find pollution at its source.
Kando places sensors through wastewater networks and uses AI to detect industrial pollution, blockages and public health signals, helping utilities protect treatment plants and enforce discharge rules.
Its wastewater epidemiology work drew attention during COVID-19 and it now works with utilities in several countries.
SolarEdge, the Nasdaq-listed maker of solar inverters and power optimizers, is the largest by revenue. Among private companies, Tomorrow.io, valued above $1 billion after a $175 million round in early 2026, is the largest.
Scarcity forced innovation. Israel pioneered drip irrigation (Netafim), runs some of the world's largest seawater desalination plants and reuses most of its treated wastewater for agriculture, the highest rate in the world. Utilities like Mekorot work closely with startups, giving them real infrastructure to test on.
Technology that cuts the energy and water use of AI data centers, such as ZutaCore's waterless liquid cooling, alongside grid storage, building water management and climate risk analytics. Green hydrogen and alternative proteins remain active but have had a harder funding environment.
Israeli and international climate and impact funds, corporate investors from energy and industrial groups, and the Israel Innovation Authority, which runs dedicated climate programs.
Across the center (Tel Aviv, Herzliya, Rosh HaAyin, Yavne), in Caesarea's industrial park and in the Negev, where solar and desert agriculture research is concentrated around Ben-Gurion University and the Arava.