Onyx Power, the operating name of Onyx Germany GmbH, is a Berlin-headquartered European energy provider specializing in the safe and weather-independent generation of electricity and heat through thermal power plants. The company operates coal- and biomass-fired facilities at multiple sites across Germany and the Netherlands, delivering reliable, dispatchable power that supports grid stability and energy security in the region.
Key locations include Wilhelmshaven (726 MW net capacity, commissioned 2015), Rotterdam/Maasvlakte in the Netherlands (731 MW, 2015), Zolling in Bavaria (472 MW coal unit plus 21 MW biomass CHP, with additional gas turbines), and Farge near Bremen. Total installed generation capacity is reported in the range of approximately 2,000 to 3,100 MW depending on the source and inclusion of recent assets such as Datteln 4. The company employs around 400 to 550 people across its power plant sites and offices in Düsseldorf and Bremen.
Onyx Power was formed following the 2019 acquisition by Riverstone Holdings LLC of Engie’s relevant German and Dutch power assets. In February 2026, ResInvest Group, an international commodities trading and investment firm with Czech roots, completed the acquisition of Onyx Power from Riverstone. The company is actively advancing its energy transition strategy by phasing out coal-fired generation in line with regulatory timelines, expanding biomass utilization, preparing sites for hydrogen-ready operations, and exploring new low-carbon technologies while maintaining operational excellence and local employment.
As an independent power producer, Onyx Power plays a notable role in Europe’s conventional and transitioning thermal generation sector, emphasizing efficiency, environmental controls, and responsible resource use at its modern facilities.
Also known as Onyx Power Group, Onyx Kraftwerk Wilhelmshaven GmbH & Co.KG, and Riverstone Germany MidCo GmbH.
chemXplore tracks 1 project involving Onyx Power, of which one is active.
Onyx Power's role on them: Owner, Operator, and Developer.
1 new construction.
Targeting: Carbon dioxide (1), Hydrogen (1), Natural gas (1)
Agreement secures a possible tie-in to OGE’s coastal hydrogen pipeline, enabling hydrogen injections into Germany’s core network when the pipeline completes in 2027; site adjacent to LNG terminal.
A 1,200 MW autothermal reformer planned to produce ~300 kt/yr low‑carbon hydrogen; EIA process started; aims to supply industry and cut CO2 via CCS, with target start in 2028.
