Capalo AI and FILKAB Solar Partner on Hybrid Solar PV and BESS Optimization and Trading in Bulgaria
Helsinki, Sofia, 25 June 2026 – Capalo AI, a sustainable technology company specializing in optimization, trading, and route-to-market services for battery energy storage and hybrid renewable assets, has entered into a partnership with Filkab Solar, a Bulgarian renewable energy developer and operator with extensive experience in the development, construction, and management of solar and hybrid power plants across Bulgaria.
The partnership covers a 2 MW/10 MWh battery energy storage system (BESS) and 5 MWp PV in Bulgaria, where the battery system operates in a solar-coupled configuration, charging exclusively from on-site generation and discharging during higher-value market hours. Capalo AI provides end-to-end optimization and trading services for the asset, including Day-Ahead and Intraday market participation, Balance Responsible Party (BRP) services, and coordinated dispatch of solar and storage as a single flexible unit.
One of the defining characteristics of this partnership has been the speed of execution. From contract signing to live market trading, the full preparation and integration phase was completed within three weeks during April 2026. A key part of this process was FILKAB Solar’s implementation of Capalo AI’s hybrid asset control logic into the plant controller, completed by the FILKAB Solar team in one week. This is the fastest integration delivered by any Capalo AI partner to date and reflects a high level of technical capability and collaborative execution on both sides.
The first full month of operation, May 2026, delivered results above expectations. Day-Ahead trading generated 92% of total revenue, while Intraday trading contributed an additional 8% on top of the expected Day-Ahead baseline. This is particularly notable given that Intraday optimization and ID trading were only activated during the final seven days of the month. Based on these early results, Intraday trading is expected to contribute up to 25-30% additional revenue compared to a Day-Ahead-only strategy in the coming months.
The first month of live operation demonstrates that unlocking the full value of hybrid renewable assets requires more than technology deployment. It demands precise control system integration, fast execution, and intelligent market optimization working together. Both teams look forward to building on these results in the Bulgarian power market.
“A solar-plus-storage asset is only worth as much as the engineering behind it. Our team had Capalo AI’s hybrid control logic running in the plant controller in a single week. The fastest any of their partners has managed, because we built the plant to be optimized and traded from day one. That is what turns installed megawatts into a responsive, revenue-generating asset, and it is the standard we want to bring to many more projects across Bulgaria,” stated Slav Landov, Managing Director of FILKAB Solar.
“Bulgaria is an exciting market for hybrid asset optimization, and FILKAB has demonstrated exactly the kind of technical readiness and execution speed that makes a real difference in commercial performance. We are proud to have completed the fastest integration for Capalo AI to date, and we look forward to unlocking further value from this asset in the months ahead as we also build out our presence in Bulgaria,” said Henri Taskinen, CEO of Capalo AI.
ABOUT FILKAB SOLAR
FILKAB Solar designs, builds and maintains industrial systems for the generation, storage and management of electricity. The company grew out of a specialist team established within FILKAB AD in 2010 and became a standalone business in 2015. Since then it has delivered more than 100 photovoltaic plants totalling over 160 MWp of realised capacity. Positioned between the largest EPC contractors and small installers, FILKAB Solar competes on engineering depth – electrical design, intelligent asset management, SCADA integration, and data exchange with energy traders, distribution operators and the Electricity System Operator (ESO). As part of the FILKAB AD group, which spans trade, project delivery and manufacturing, it can source a significant share of a project’s materials and solutions in-house.
www.filkab.solar
About Capalo AI:
Capalo AI is a sustainable technology company specializing in AI-driven optimization and trading of standalone and co-located battery energy storage systems. Its turnkey service, Capalo Zeus VPP™, provides route-to-market access, AI-optimized multi-market trading and optimization, Balance Responsible Party (BRP) and Balance Service Provider (BSP) services, managing everything from prequalification to lifetime value maximization. Capalo AI operates and optimizes flexible assets across six European markets, Bulgaria, Finland, Lithuania, Latvia, Poland, and Sweden and is expanding its operations across another five European markets in 2026, Estonia, Greece, Portugal and Spain. The company manages 1.5 GW of batteries and 460 MWp of solar, of which 500 MW and 300 MWp are already live under trading and optimization.
