GEN-I and SUNOTEC join forces in the field of BESS
GEN-I and SUNOTEC have signed a 5-year partnership agreement in the field of battery energy storage system (BESS) management. Under the agreement, GEN-I will take over the management of two large battery energy storage facilities that SUNOTEC is building in Bulgaria, as part of its investment strategy – one with a capacity of 150 MW and a storage capacity of 379 MWh, and the other with a capacity of 50 MW and a storage capacity of 126 MWh, both expected to become fully operational by the end of March 2026.
Under the signed agreements, we will act as the exclusive asset optimiser and trading partner for both battery systems. We will manage the charging and discharging of batteries, ensuring participation in wholesale intraday and day-ahead markets as well as ancillary service mechanisms. Our role includes real-time dispatching, market optimisation and revenue management, with full algorithmic 24/7 support. The cooperation is based on a long-term revenue-sharing model that aligns the interests of both parties – SUNOTEC as the asset owner and GEN-I as the optimisation partner – aiming to maximise market value while ensuring stable operation and full regulatory compliance.
»This partnership marks an important milestone for both GEN-I and SUNOTEC. Together, we are managing battery storage projects with a total capacity of around 200 MW. It’s the first large-scale cooperation of this size for GEN-I and a key step forward in growing our portfolio of energy storage assets under management as an asset optimizer. With our strong expertise in energy trading across all European markets, optimization, and ultra-short-term algorithmic trading, GEN-I helps batteries work smarter – turning flexibility into real market value. With rapid expansion of our portfolio, we are contributing to a more efficient, flexible, and sustainable energy system for the entire region«, emphasized Igor Koprivnikar, Ph.D., MBA, Member of the Management Board of GEN-I, d.o.o., upon signing the contract.
The partnership combines SUNOTEC’s leading engineering and construction expertise with GEN-I’s advanced capabilities in energy trading, market integration, flexibility, and optimisation. The collaboration leverages synergies across the full lifecycle of battery energy storage assets – from development and construction to operational management and market optimisation – maximizing value for investors and creating resilient energy system in the region of South East Europe.
GEN-I is one of the fastest-growing and most innovative players in the European energy markets. It was recognised as the Best Energy and Power Dealer in Europe in the prestigious international Energy Risk Commodity Rankings 2025. With a presence in 26 markets, we leverage a diversified trading infrastructure that combines global market access with deep regional insight. This allows us to exploit synergies arising from its geographical expansion into new strategic markets, as well as the connection between more liquid Western and less liquid South Eastern European markets. In addition, we enhance our offering through a comprehensive suite of services related to the green transformation, with a strong focus on RES management, ancillary services, and BESS optimisation. Our advanced optimisation models, 24/7 trading operations, and integrated risk and operational processes underpin our strategic vision of becoming the leading asset optimiser in the region.
SUNOTEC is a leading European company in the development and construction of large-scale solar power plants, specialising in the end-to-end delivery of future-ready energy infrastructure. Through vertically integrated services spanning neering, manufacturing, construction, O&M, and BESS, SUNOTEC offers comprehensive solar solutions designed for optimal performance, reliability, and long-term impact.
Founded in 2012, the company has completed over 650 ground-mounted PV installations, with a total capacity exceeding 11 gigawatts across Europe. Headquartered in Sofia, Bulgaria, with additional offices in Munich, Germany and London, United Kingdom, SUNOTEC combines international expertise with local execution. The company employs over 2,000 professionals worldwide and continues to expand into new markets, including West Africa, Latin America and the Nordics through strategic partnerships and joint ventures. Guided by sustainability and circular economy principles, SUNOTEC is powering the global energy transition, one integrated solar plant at a time.
Photo (from left): Igor Koprivnikar, Ph.D., MBA, Member of the Management Board of Gen-I, and Kaloyan Velichkov, CEO and founder of Sunotec.
