Germany breaks ground on major battery storage projects

HyperStrong has broken ground on the GigaBattery Boxberg 400, a 400 MW/1.6 GWh battery energy storage system in Saxony, Germany, acting as turnkey contractor for project owner LEAG Clean Power. The facility is being built on a six-hectare remediated site at the Boxberg power plant location.

HyperStrong’s German subsidiary signed the EPC agreement with LEAG in November 2025. The project will use HyperStrong’s liquid-cooled HyperBlock III system, configured for four-hour duration, and will connect to the 50Hertz transmission grid through a new 380 kV substation. Upon completion, LEAG says the facility could theoretically supply electricity to approximately 640,000 households for four hours.

The project is one of Europe’s largest battery storage projects currently under construction. It forms part of LEAG’s planned GigaBattery pipeline, which also includes the 1,000 MW/4,000 MWh GigaBattery Jänschwalde project; combined, LEAG’s announced GigaBattery projects total 1.4 GW/5.6 GWh.

Separately, Sunotec has started construction on a 100 MW/441 MWh standalone battery storage system in Stendal, in the German state of Saxony-Anhalt, after the project reached ready-to-build status in the second quarter of 2026.

Sunotec is acting as full turnkey provider, covering engineering, installation, and long-term operations and maintenance, with commissioning targeted for the first quarter of 2027.

WT Energiesysteme will build a new 110 kV substation at the site to provide the grid-connection infrastructure. Around 65 guests from politics and the energy industry attended the project’s official groundbreaking last week.

The storage system is intended to increase grid flexibility, absorbing electricity during periods of high solar and wind generation and discharging it when demand requires.

Sunotec has reported several developments in Germany this year. In January, it secured a contract for the first of four construction phases of a 230 MWh storage system for Seac.

In April, investment firm Blackstone acquired a stake in Sunotec for €250 million, with the company’s founders remaining majority shareholders; the funds are intended to accelerate Sunotec’s European expansion.