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In our previous market insight, we explored the opportunities and challenges shaping Romania's BESS market. Now, in Powering Eastern Europe's Grid Resilience, we look at how SINEXCEL is responding through local project experience and practical PCS engineering.
On June 29, Romania's day-ahead electricity price reached €224/MWh—the EU's highest that day—highlighting limited system flexibility during tight supply.
Meanwhile, Romania completed its first solar-profile electricity transaction and is working towards a standardised Guarantees of Origin market with European recognition from 2027. More renewable generation and increasingly sophisticated power trading are reinforcing the need for energy storage.
This demand is particularly visible in renewable-rich regions. Solar capacity is expanding in Oltenia, while concentrated wind development is increasing grid pressure in Dobrogea. Local market engagement also indicates growing demand for two- and four-hour BESS, with solar-storage co-location gaining momentum.
These projects must both shift renewable electricity into peak-demand periods and remain connected during sudden grid disturbances. This requires fast PCS response and sufficient short-term current headroom to reduce unnecessary power limitation or tripping.
Over the past years, SINEXCEL has secured more than 1GW of PCS orders across nearly 20 BESS projects in Romania, gaining practical experience across diverse system configurations and grid-connection conditions.
Two recent projects highlight different aspects of SINEXCEL's product performance and project delivery capabilities.
A recent 23 MW/100 MWh solar-storage project, distributed across three remote sites, uses SINEXCEL's StellaON 1250 PCS.
The project is designed to shift solar electricity into peak-demand periods while maintaining reliable operation under changing site and grid conditions.
Energy shifting defines its commercial role. Short-term current capability supports its technical delivery.
StellaON can provide 1.5x overload for 60 seconds. This gives the system additional headroom during events such as transformer energisation, load steps and short-duration grid disturbances.
The purpose is to avoid reaching the PCS current limit too early when a critical transient occurs.
For EPCs and developers, this headroom can contribute to:
more robust transformer-energisation strategies;
smoother commissioning sequences;
lower risk of unnecessary tripping;
greater flexibility in protection coordination;
more predictable grid-compliance testing.
However, overload capability cannot be assessed in isolation.
Its usable value depends on coordination among the PCS, battery, transformer, protection system, EMS, PPC and connection-point requirements.
The project must also verify that the battery can support the required power, that protection settings recognise the intended operating envelope, and that thermal and control limits remain coordinated throughout the event.
That system-level coordination is what turns a PCS specification into useful project performance.
Another Romanian utility-scale BESS connected to the grid on April 28, 2026. Following a one-month trial period, the project entered full commercial operation at the end of May.
The system architecture includes:
two 3.45 MW SINEXCEL medium-voltage skid solutions;
four high-density 20-foot battery containers;
The project is designed primarily for peak–valley electricity arbitrage. Its control system coordinates charging and discharging according to market signals while providing operators with the monitoring and dispatch functions required for commercial operation.
The architecture also reserves a 7 MW solar-integration interface, allowing photovoltaic capacity to be added in the future without fundamentally redesigning the storage platform.
This forward-looking approach gives the asset owner greater flexibility to respond to future market conditions, renewable-development plans and grid-connection opportunities.
The two projects demonstrate that SINEXCEL's differentiation comes from two complementary strengths.
More than 1GW of PCS orders across nearly 20 projects has given SINEXCEL experience across diverse BESS configurations, connection conditions and customer requirements in Romania.
StellaON delivers 1.5× overload for 60 seconds, providing additional margin during transformer energisation, load steps and other transient events. This supports stable operation through short-duration impacts at challenging connection points.
This short-duration dynamic support is particularly valuable in Romania, where renewable generation is concentrated at certain connection points and local grid fluctuations can be more pronounced.
From medium-voltage skid solutions to reserved interfaces for future PV integration, SINEXCEL configures systems around both current revenue models and future expansion requirements.
Supported by its German subsidiary, four European service partners and three spare-parts warehouses across Europe, SINEXCEL provides onsite commissioning and repair, local spare-parts support and technical consultation across key European markets, including Germany, France, Spain, Hungary, Romania, Czechia and Denmark.
Together, these capabilities help streamline commissioning, reduce tripping and redesign risks, and improve certainty around grid connection, project delivery and long-term operation.
Across its 1GW Romanian order portfolio, SINEXCEL is turning PCS capability, system-level engineering and local support into more predictable delivery and more dependable BESS assets.
Romania is only the first chapter in our journey through Eastern Europe.
Next stop: Hungary—where local compliance and fast certification accelerate the journey from grid connection to multi-market operation.
Romania and Hungary record Europe’s highest day-ahead prices – Balkan Green Energy News
Romania’s June 30 evening price exceeds €1,000/MWh – InvesTenergy
Romania completes its first solar-profile electricity transaction – Bursa.ro
Romania prepares a European-recognised Guarantees of Origin market – Energynomics
ANRE removes double network charging for stored and reinjected electricity
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