Stem’s PowerTrack EMS to Hybridize Two Hungarian Solar Plants with Battery Storage
Event summary
- Stem’s PowerTrack EMS selected to hybridize two 60 MWp solar plants in Hungary with 40 MW / 80 MWh battery storage systems.
- Commercial operation of the fully hybridized assets expected by September 2026.
- PowerTrack EMS will coordinate solar generation, battery dispatch, grid constraints, and market dispatch under a five-year agreement.
- Initial focus on Hungary’s automatic Frequency Restoration Reserve (aFRR) market with future expansion into FCR services.
The big picture
This project underscores a broader trend in European renewable-energy markets where owners are adding battery storage to existing solar facilities to enhance flexibility, reduce curtailment, and create new revenue streams. Stem’s PowerTrack EMS provides an integrated solution that allows for seamless coordination of solar generation, storage, grid interconnection, and market dispatch, positioning the company as a key player in the hybridization of renewable assets.
What we're watching
- Market Expansion
- Whether Stem can leverage this project to expand its PowerTrack EMS platform across other European markets.
- Technical Integration
- The pace at which Stem and Pannonwatt can mitigate execution risks in hybridizing existing solar assets with battery storage.
- Regulatory Dynamics
- How evolving ancillary-services markets in Central and Eastern Europe will impact the commercial viability of these hybrid assets.
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