ESG: Maximising Revenues from a 15 MW Co-located BESS in the Netherlands

With Veolia’s Flexcity offer and enspired, ESG optimises its 15 MW co-located battery across aFRR and wholesale markets to maximise revenues.
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BESS Battery
Case study

Maximising Value from a 15MW Co-located BESS in the Netherlands

Veolia, through its Flexcity offer and enspired, is optimizing ESG’s 2-hour battery project co-located with solar across ancillary services and wholesale to maximize revenues.

Valorized asset
Battery

Services provided by Flexcity offer
aFRR

Location
Netherlands

 

Customer Challenge

ESG is the largest independent green power producer (IPP) in the Benelux area, with a total green asset portfolio of over a GW and an operational portfolio of 983 MW at the time of writing (March 2026). 

The company supplies green power to 250,000 households and reduces CO2 emissions by 400,000 tons annually. ESG plays a leading role in Europe’s transition to clean energy and aims to scale additional projects in green energy production, storage, and EV charging.

 

 

ESG logo
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The project involves a 15 MW/30 MWh battery and a 41 MWp PV sharing a 21.6 MW connection point on a co-located site in Sellingen, Groningen, in the Netherlands. enspired is optimizing the battery in a fully merchant structure, primarily in aFRR (automatic Frequency Restoration Reserve) and wholesale intraday, with the Flexcity offer of Veolia providing access to ancillary services and crucial local market expertise. 

To maximize revenues, fully automated trading strategies decide when to place bids and activate dispatch based on real-time market conditions.

Solution

As a major actor in Europe’s energy transition, ESG (Energy Solutions Group) manages sustainable energy projects across the Benelux region, among others, a 15 MW/2-hour BESS (battery energy storage system) co-located with PV (photovoltaic) in the Netherlands. enspired, alongside local partner Veolia, was chosen to optimize commercial results in a cross-market setup.

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Aron Vanneste

Aron Vanneste
Asset Lead of BESS and Renewables, Veolia's Flexcity offer

We see the co-location of BESS and RES (renewable energy sources) as the main investment priority for developers and IPPs in the Netherlands. Moving from the ideation phase to actually operating and optimizing co-located assets has been a great journey for ESG, Veolia, and enspired. We are proud to deliver attractive returns while taking grid and regulatory constraints into account.

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Beyond the directly connected solar park, this battery enables the integration of additional renewables, saving more emissions and driving forward the energy transition.

“Co-location keeps renewables buildable in an increasingly congested network. By continuously training our algorithms to stay on top of changing market conditions and technical constraints for co-located assets, we make sure the battery performs optimally in the market and continues to safeguard the shift to clean energy. ESG is a true pioneer in green tech, and it’s been a welcome challenge to tackle co-location in the Netherlands together with our trusted partner Veolia.”

Cécilia Masut
Senior Sales Advisor
Strategic Partnerships enspired
Cécilia Masut

 

 

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Benefits

Frederik Jansen

Frederik Jansen
ESG CTO

Since the market is so dynamic and constantly poses new challenges, it was important to us to engage partners who know how to handle intricate commercial conditions. Demonstrated successes in the Dutch market as well as enspired’s solution-oriented approach to regulatory complexities in Germany are perfect testaments to that, and we appreciate the high level of transparency offered by this partnership.

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Working with Veolia

Our Flexcity offer helps energy-intensive companies turn existing infrastructure into new value - optimizing flexible capacity across ancillary services, imbalance markets, and more. Whether you're in industry, agriculture, or logistics, we make flexibility work without complexity.

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