Turnkey hybrid PV + BESS plants

What a hybrid PV + BESS plant is

A hybrid plant combines a solar park and a battery energy storage system (BESS) behind a single grid connection. The panels produce at noon; the batteries keep part of that energy and deliver it in the evening, when demand and prices rise. For the grid the plant becomes a more predictable source; for the owner, a business with several revenue streams.

In Moldova this set-up is especially timely. 583 MW — 56% of renewable capacity — operates on the free market, and in spring and summer the average daytime price falls to €0–25/MWh (WatchDog, 2026). The Ministry of Energy estimates that at least 600 MW of storage is needed, against about 150 MW installed. Storage turns the midday surplus into evening energy.

What turnkey EPC covers

Pre-development: site, grid, model

We start with an audit: terrain and soils, multi-year irradiation data, land status and the distance to the nearest substation with spare capacity. The result is a first configuration — PV capacity, BESS size, connection scheme — and a revenue model across several market scenarios.

Permits and grid connection

We prepare the design documents, obtain the approvals and agree the connection terms at 10, 35 or 110 kV with the grid operator. This stage often sets the overall schedule, so we start it as early as possible.

Procurement

We select modules, trackers, inverters and BESS from bankable manufacturers — with warranties, certification and track records that banks accept. Supply contracts follow the construction schedule.

Construction and commissioning

Piles, trackers, modules, cabling, BESS containers and the substation are built by one team. Then come tests, energisation and handover with full documentation and staff training.

Choosing the BESS configuration

The key parameters are power (MW) and energy (MWh). Shifting energy from noon to the evening usually takes 2–4 hours of storage. The architecture matters too: AC-coupled batteries have their own converter and are easy to add to an existing plant; DC-coupled systems send surplus PV to the batteries without double conversion. Grid-forming converters let the battery support grid voltage and frequency — something operators ask for more and more.

Where the revenue comes from

• Day-ahead arbitrage. Moldova’s day-ahead market has run since December 2025; the battery charges when power is cheap and sells in expensive hours.
• Fewer imbalances. The single imbalance price turns a forecast error into a direct cost; the battery covers deviations.
• Arbitrage and aggregation. The battery sells power in expensive hours, and in a portfolio with other assets deviations go down. See arbitrage and aggregation. A BESS can join the balancing market through a registered balancing service provider (BSP / FSE).
• Less curtailment. Energy that would otherwise be cut at noon goes into the batteries.

BESS safety

We use thermally stable LFP (lithium iron phosphate) chemistry, liquid-cooled containers, fire detection and suppression, separation distances and fire lanes. Equipment is tested to UL 9540A, IEC 62933 and NFPA 855. More on the Technology & partners page.

Operation

After start-up we can take over maintenance, SCADA and EMS monitoring, battery dispatch on the market and monthly reports. For plants already in operation we offer a BESS retrofit.