How SOLARsk’s Own Energy Storage System Generates Revenue and Builds Expertise in the Electricity Market

In today’s energy sector, success is measured not only by capacity, but also by economic efficiency and real-world experience. SOLARsk demonstrates how a properly designed and certified energy storage system (BESS) can generate tangible revenue while strengthening expertise without exposing clients to risk.

In the first months of operation, our BESS has shown strong technical and financial performance, with an expected payback period of 3.5–4 years.

System capacity is 1,210 kW, with 5,038 kWh storage capacity. Battery type: Sungrow ST455kWh-110kW-4h (11 units).

Importantly, the BESS has been certified by NРC Ukrenergo and, since February 1, 2026, has been providing ancillary services in the Ukrainian electricity market.

Why Owning an BESS Is a Unique Advantage

By building an BESS for itself—rather than “learning on clients”—SOLARsk gains hands-on experience at every stage:

• installation and grid connection
• operation and maintenance
• electricity trading and balancing services

We understand every detail of system performance and can anticipate potential issues already at the design stage, reducing risks and improving economic efficiency.

“Service, warranty, stable operation, and a properly defined technical specification from the outset determine the system’s lifetime, total cost, and operating expenses. Only a comprehensive approach ensures efficiency and reliability,” — Andrii Antonov, CTO of SOLARsk.

Key Factors for Evaluating BESS Profitability

Accurate planning of charge/discharge cycles, electricity market tariffs, maintenance costs, and battery lifetime are critical factors in assessing profitability. As this is our own system, SOLARsk tests and optimizes all processes in real conditions, ensuring predictable results.

“We built this BESS for ourselves—and within just two months, it generated UAH 3 million in revenue. Everything works exactly as planned, proving that our approach maximizes returns and efficiency for every investment,” — Yevhen Yaremenko, Founder of SOLARsk.

Investing in BESS with SOLARsk means combining advanced technology, hands-on operational experience, and real economic returns that start from the very first months of operation.