BET Consulting GmbH (BET) and Energy2market GmbH (e2m) present the BESS Co-Location Index, a new, freely accessible market index that transparently quantifies the daily added value that battery storage systems can achieve when operated together with photovoltaic systems. BESS co-location – the combination of PV system and battery storage at one location – is considered to be one of the most important trends for 2026 and 2027.
Development and validation
The practical development and independent validation of the index is based on the close cooperation between BET and e2m. BET developed the model based on extensive project experience and is responsible for the conception, modeling, data processing and publication of the index. e2m complements the model with in-depth market expertise and a large operational co-location portfolio of PV and battery storage systems. Based on real marketing and optimization results from the ongoing operation of hybrid systems, e2m continuously validates the model values and reflects current market mechanics, revenue structures and restrictions in practice. The combination of methodologically sound modeling and practical validation enables a robust and comprehensible reference value. The index thus provides a transparent view of real additional revenue – independently and neutrally.
Dr. Alexander Kox, Managing Director at BET, emphasizes: “The index closes a key information gap in the market and offers investors, project developers, banks and operators an objective orientation and reliable basis for evaluating hybrid PV projects and existing forecasts.”
Dr. Lukas Löhr, Head of the Competence Team Energy Market Models & Price Forecasts at BET, continues: “In times of falling PV market values and scarce grid connection capacities, the topic of co-location is gaining enormous importance. The BESS Co-Location Index is a freely accessible tool as a starting point for in-depth, project-specific analyses.”
Kai Becker, Chief Development Officer at e2m, explains: ” Right from the start, our aim was to bring transparency to a topic that is currently of great interest to the market, but whose economic potential is often underestimated or misjudged. The BESS Co-Location Index combines scientific modelling with our operational market experience from the optimization of real co-location facilities – this is exactly the perspective the market needs now.”
Rüdiger Deilke, Portfolio Manager at e2m, adds: “We have consistently mirrored the index values with real marketing results. This ensures that the index does not remain a theoretical figure, but realistically reflects the actual revenue potential of co-location projects.”
The index shows the achievable added value of different storage strategies compared to PV-only operation on a daily basis. It differentiates between different types of storage: Green electricity storage (exclusive option without grid reference, EEG quality is retained), gray electricity storage (grid reference possible, EEG quality is lost) and mixed electricity storage (demarcation option enables grid reference through metering concept, EEG quality is retained). The additional revenue is primarily related to the installed capacity of the battery storage system in order to ensure comparability with existing stand-alone BESS key figures. In addition, the market value of the system combination can be compared with the market value of the PV system alone.
The index is based on a detailed simulation of the trading and operating behavior of the system combination on the relevant spot markets. The calculation is carried out with a 15-minute resolution and takes into account the day-ahead market, intraday auctions, continuous intraday trading as well as published market values and weather data on PV feed-in on a daily basis.
The current index version shows several striking results: BESS co-location delivers clearly measurable additional revenues compared to PV-only – especially in phases of eroding market values, as is typical in summer. Green electricity storage systems generate around 50 percent lower revenues than gray electricity storage systems, but green electricity storage systems offer easier grid access and funding opportunities. Due to the future availability of the deferral option, a mixed electricity storage system can generate considerable additional revenue compared to pure green electricity operation, but the added value compared to gray electricity operation is low for new PV systems.
The index is now freely accessible and serves as an objective benchmark for market participants. Detailed, project-specific evaluations can be prepared as part of BET’s consulting services.
The index, methodological principles and areas of application are available online here:
BET and e2m will also be presenting the new index at E-world energy & water from February 10 to 12, 2026 at the BET stand in Hall 3, Stand 3C120. The team will be available there for discussions and questions about the index. Please contact us to arrange an appointment.
Press contact
Energy2market GmbH
Bettina Brammer
Head of Marketing
BET Consulting GmbH
Alexandra Böckem
Head of Marketing & Sales Management
alexandra.boeckem@bet-consulting.de
BET Consulting GmbH (BET) is a leading management and specialist consultancy for the transformation of the energy industry. For more than 35 years, the owner-managed and independent company has been supporting energy and industrial companies, investors and public clients with strategic, regulatory, technical and economic issues. With over 130 employees in Aachen, Berlin, Leipzig and Zofingen (Switzerland), BET combines excellent expertise with end-to-end responsibility and develops practical solutions for a digital, decentralized and decarbonized energy world.
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