RWE (renewable energy company) has begun construction of a new utility-scale solar park inside the Hambach opencast mine in the Rhein-Erft district of Germany, with a co-located battery storage facility set to follow later this year.

The project marks the latest expansion of the company's renewable energy footprint at a site that is gradually transitioning from active lignite mining to a future lake landscape.

Solar Installation Underway at Former Mining Terrain

The "Manheimer Bucht" solar park is being built within the municipality of Kolpingstadt Kerpen and will occupy an area roughly equivalent to 20 football pitches. Installation of the first parts of the substructure and some of the 25,300 solar modules has already begun.

Upon completion, which is expected before the end of 2026, the facility will have a generating capacity of 16.5 megawatts peak, or 14.8 megawatts on an alternating current basis. RWE says the plant will produce enough electricity to supply the equivalent of approximately 5,000 households annually.

The site sits at what will eventually become the southern end of the future lake, forming as the Hambach opencast mine is decommissioned and fills with water.

That process is expected to take several decades, and RWE has stated it is using the intervening period to develop renewable energy projects across suitable and approved areas within the mine's footprint.

Battery Storage Facility to Support Grid Stability

Alongside the solar park, RWE plans to construct a co-located battery storage facility with a capacity of 80 megawatt-hours. Construction of the storage system is scheduled to begin this summer, with commissioning targeted for the end of 2026. The company said the battery installation is intended to contribute to grid stability by making generated electricity available at times when it is most needed.

Sopna Sury, CEO of RWE Renewables Europe and Australia, described the project as part of a broader strategy to expand the company's solar portfolio while integrating storage capability.

"By adding battery storage systems, we can make the generated electricity available when it is needed," Sury said, also highlighting the importance of local engagement in the company's approach to renewable development at the site.

Lars Kulik, the RWE Power board member responsible for the lignite division, framed the project in the context of the region's energy future. "Our opencast mines are turning into lakes. To ensure that the region remains an energy hub, we are using the future lake areas to expand renewable energy in the meantime," Kulik said.

Expansion Builds on Existing Operations at Hambach

The Manheimer Bucht project adds to a portfolio of renewable energy assets that RWE already operates at the Hambach opencast mine. Three solar farms and one battery storage facility are currently in operation at the site, with a combined solar generating capacity of 61 megawatts peak. Together with the new Manheimer Bucht installation, RWE states it operates nine large solar parks across the wider Rhenish region.

All of the existing Hambach renewable projects, and the new one under construction, are being developed in collaboration with NEULAND HAMBACH GmbH, a company representing the inter-municipal interests of six surrounding communities: Elsdorf, Jülich, Kerpen, Merzenich, Niederzier, and Titz.

The partnership structure gives those municipalities the opportunity to participate directly in the renewable energy investments being made on land associated with the former mine. RWE confirmed that the surrounding municipalities also have the option to participate in the Manheimer Bucht project under the same cooperative framework.

Region's Energy Identity Shifting Alongside Mining Transition

The Hambach opencast mine has historically been one of Germany's largest sources of lignite, a form of coal used in power generation. As Germany continues its broader energy transition and coal-fired generation is phased out, the physical landscape of the Rhenish mining region is changing alongside it. The gradual flooding of the Hambach mine to form a lake represents one of the most visible aspects of that transformation.

RWE's approach at Hambach involves treating the pre-flooding period as a window for deploying renewable infrastructure. The approved areas within the mine boundaries are being progressively converted for solar use while the water level remains low enough to permit construction and operation.

Once the lake reaches the Manheimer Bucht area, the current solar installations will no longer be viable, but in the interim, the company and its municipal partners are generating clean electricity and building storage capacity from terrain that would otherwise sit idle.

The battery storage component of the new project reflects a growing emphasis within the industry on pairing generation assets with storage to address the intermittency of solar power and provide services to the electricity grid.

RWE's decision to commission an 80 megawatt-hour storage system alongside a 16.5 megawatt peak solar installation positions the Manheimer Bucht site as a combined generation and grid-support facility from the moment it begins operating.

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