Renewable Energy Companies in Polska

KIER Institute is a Polish renewable energy consulting and implementation firm founded in 2015. It provides technical documentation, design, installation, and advisory services for solar, wind, biogas, and energy efficiency projects to businesses and government institutions.

Leading Polish biogas producer operating 21 biogas facilities and 6 solar farms. Generates electricity and heat from agricultural waste, manages ~800,000 tonnes of organic waste annually, and targets 2 TWh production by 2030. Co-owned by TotalEnergies and HitecVision since 2023-2025.

Vaillant is a leading manufacturer of home comfort systems including heat pumps, condensing boilers, photovoltaic systems, solar collectors, and mechanical ventilation with heat recovery for residential and commercial applications.

Solar and electrical installation specialist in Giżycko offering photovoltaic design, installation, maintenance, and cleaning services since 2013. Also provides ventilation recovery systems and 24/7 technical support.

Solar-Project specializes in photovoltaic system design, installation, and maintenance. Founded in 1992, the company has executed nearly 3,000 PV installations with over 100 MWp total capacity. Services include residential, commercial, industrial, and agricultural solar solutions, energy storage, heat pumps, and EV charging stations across Poland.