Romanian developer 4P Renewables plans to develop around 500 MWp of solar capacity paired with 1.8 GWh of battery storage, adding to evidence that Romania’s renewable investment cycle is shifting rapidly towards longer-duration BESS.
The portfolio has an estimated construction value of about €500 million and will be developed across several counties.
Construction is expected to begin in stages from Q4 2026, with commissioning targeted during 2027-2028.
The storage component is particularly significant.
At 1.8 GWh, the proposed BESS portfolio is large relative to the 500 MWp solar fleet and would allow meaningful volumes of electricity to be shifted for several hours.
That distinguishes the projects from earlier solar-storage developments where batteries were often sized mainly for grid support or short-duration balancing.
The commercial rationale is increasingly linked to Romania’s intraday price structure.
Rapid solar additions are depressing midday values while evening prices remain much stronger.
Recent market sessions have produced spreads of more than €100/MWh between solar-heavy periods and the evening peak.
Longer-duration storage allows project owners to capture part of that spread.
4P intends to use a mixed development model.
Some projects may be sold once they reach ready-to-build status, while others could be retained for operation and exposure to trading, balancing and storage optimisation.
The strategy reflects the changing economics of renewable development.
Developers can monetise mature projects through asset sales while retaining selected sites where merchant flexibility offers greater long-term upside.
Romania is becoming one of the most active BESS markets in southeast Europe.
Installed battery power was already close to 1 GW by mid-2026, while a growing pipeline of two-hour and four-hour projects is moving through construction and financing.
That expansion should improve system flexibility but is also likely to increase competition between storage assets.
Arbitrage spreads may narrow as more batteries charge during low-price hours and discharge into the evening peak.
Balancing revenues could also fall as additional capacity enters ancillary-service markets.
Future BESS investment cases will therefore need to assume lower returns than those available to early projects.
Grid access may become equally important.
Storage located at constrained or strategically valuable network points could earn significantly different returns even with the same battery technology.
Projects combining secure grid capacity, solar generation and sufficient duration are therefore likely to command higher valuations.
The planned €500 million 4P portfolio reflects that shift.
Romania’s next renewable investment cycle is increasingly being measured not only in megawatts of generation but in megawatt-hours of flexibility available after the solar production window closes.
