Noerr advises Polarium on partnership with RWE involving marketing for virtual battery storage

A Noerr team led by Gabriele Haas has advised Polarium on an agreement with German utility company RWE to market battery flexibility on the German electricity market in a new and innovative way. This will allow the Swedish developer of decentralised battery energy storage systems and flexibility solutions to enter the German market.

Starting late 2026, Polarium aims to aggregate over 1,600 behind-the-meter battery energy storage systems (BESS) across Germany via its own cloud platform into one virtual battery, enabling real-time control and market participation while unlocking value from unutilised assets and grid infrastructure. Under the multi-asset tolling agreement, RWE will market at least 50 megawatts of capacity and 135 megawatt hours of electricity from Polarium’s decentralised battery portfolio. The company’s portfolio is set to grow to around 300 megawatts (810 megawatt hours of electricity) and more than 10,000 battery systems.

Polarium is currently developing a portfolio of battery systems distributed throughout Germany, to be primarily used as a back-up. Any flexibility not required for back-up purposes will be pooled virtually via the Polarium platform into a single, market-ready resource. Under the terms of the agreement, this virtual battery capacity will be made available to RWE.

Advisors to Polarium Energy Solutions AB: Noerr

Regulatory/Energy: Gabriele Haas (lead, partner), Silvius Treutwein (associate, both Frankfurt)

Tax: Andre Happel (partner), Thomas Renner (senior associate, both Frankfurt)

IP/Product Regulation: Christoph Rieken (partner, Munich)

Digital/Product Regulation: Julian Monschke (associated partner, Frankfurt)