Econergy Ltd. has connected its Parau 1 battery energy storage system to the grid in Romania, marking the company's first co-located solar-plus-storage project to reach commercial operation.

The system has a capacity of 70 MW and 141 MWh and sits alongside an existing 92MW solar plant that has been operational since 2024, bringing the combined installed capacity at the site to 162 MW.

A First for Econergy's Portfolio

The Parau 1 project represents a significant milestone for Econergy, which describes this as its first experience building storage around a solar asset that was already in operation.

The company has been running the adjacent solar plant since 2024, and the addition of the battery system now transforms the site into a fully integrated renewable energy and storage facility. The combined capacity figure of 162 MW reflects the aggregation of the 92MW solar plant and the 70 MW BESS installation.

The project is also notable as a template for what Econergy intends to replicate elsewhere in the country. The company stated it has the scale and grid position in Romania to repeat this model across its existing and future solar assets, signaling an intent to pursue co-location as a systematic strategy rather than a one-off development.

Grid Import Capability Opens New Revenue Avenues

One of the defining technical features of the Parau 1 BESS is its dedicated grid import capacity. This means the battery system is not restricted to charging solely from the co-located solar plant. It can draw power directly from the grid as well, giving operators the ability to charge during periods when market prices are favorable and discharge when prices rise.

Econergy described this capability as enabling optimization around market prices and the layering in of new revenue streams on top of what the solar generation alone would provide.

The flexibility to charge from either the solar plant or the wider grid gives the system a dual-purpose role that purely solar-paired storage systems, which can only charge from their associated generation asset, would not possess.

Balancing Costs and Negative Price Exposure

Beyond the commercial optimization angle, Econergy highlighted the role the BESS will play in managing grid balancing costs and negative electricity price events.

Negative prices, which occur when electricity supply exceeds demand and generators effectively pay to offload power onto the grid, are a growing concern for solar operators across European markets. The presence of a co-located battery system allows excess generation to be absorbed and stored rather than curtailed or sold at a loss.

By working in harmony with the solar plant, as Econergy described it, the storage system can reduce the financial exposure that would otherwise arise during these market conditions.

This positions the BESS as a tool for both revenue generation and cost mitigation, addressing two distinct commercial pressures that solar plant operators face as renewable penetration on grids continues to grow.

Over 1GWh of Storage Under Construction or Ready for Connection

The Parau 1 commissioning comes against the backdrop of a much larger pipeline. Econergy stated that across Romania, it currently has over 1GWh of storage either under construction or ready for grid connection.

This figure positions the company as a significant participant in Romania's emerging battery storage market and suggests that the Parau 1 project, while a first for the company, is not intended to stand alone.

The announcement did not provide specifics on which sites make up the remaining pipeline or detail the timelines for those projects reaching commercial operation, but the aggregate figure indicates that Econergy is pursuing storage deployment at scale within the Romanian market.

Romania as a Strategic Market for Co-Location

Romania has attracted growing interest from renewable energy developers in recent years, and Econergy's commentary points to the country's grid infrastructure and the company's existing position within it as key factors enabling this co-location strategy. The company cited its scale and grid position as the conditions that allow it to replicate the Parau 1 model across other assets.

The co-location approach itself, pairing battery storage with operational solar plants rather than developing standalone storage facilities or building storage into new solar projects from the outset, reflects a broader trend in renewable energy development.

Retrofitting storage onto existing solar assets allows developers to extract additional value from grid connections that are already in place, avoiding the time and cost associated with securing new connection agreements.

For Econergy, the Parau 1 project establishes a proof of concept for this retrofit model in the Romanian context, and the company's stated pipeline suggests it intends to move quickly to apply the same approach at other sites across its portfolio.

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