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Eclipse raises €20M to industrialize battery arbitrage in Europe

20 M€09.06.26Series A
Eclipse lève 20 M€ pour industrialiser l'arbitrage sur batteries en Europe
Analysis

Eclipse raises €20M to industrialise battery arbitrage across Europe

The essentials. Eclipse, founded in 2023 by Augustin Derville (ex-co-founder of Electra), has closed a €20M Series A with BNP Paribas as lead investor and Noria as co-investor. The startup is rolling out Flowstream, an algo-trading platform that buys electricity when prices collapse, stores it in batteries, and resells it at peak demand. Current pipeline: 16 projects, 850 MW, France and Belgium, with Spain in its sights.

Key takeaways

  • €20M Series A, following a €5.5M seed round two years ago — €25.5M raised in total since its founding in 2023.
  • BNP Paribas is both lead investor and offtaker: it structures the financing of BESS assets and offers hedging instruments for merchant risk.
  • A pipeline of 850 MW across 16 projects in France and Belgium, with a target of 2 GW under management by 2030.
  • In France, revenues achievable through BESS arbitrage jumped 65% between January and March 2026, reaching €173k/MW/year (source: pv magazine France, April 2026).
  • A team of around twenty people, with expansion into Spain on the roadmap.

What Eclipse does

Eclipse positions itself as an integrated battery energy storage system (BESS) operator. In practice: the startup develops, owns and operates grid-connected industrial storage assets. It relies on Flowstream, its proprietary algorithmic optimization platform, to manage these assets in real time.

The business model is built on price arbitrage. Electricity is bought when spot prices collapse — typically during peaks in solar or wind production — stored in lithium batteries, then resold during demand peaks. In France, the price spread between troughs and peaks regularly exceeded €100/MWh on the spot market in 2024. In 2026, that spread widened further, driven by increased volatility from renewables.

Flowstream stacks three revenue streams per asset: frequency reserve (contract with RTE), spot market arbitrage, and balancing services. This combination is what optimizes return on assets and reduces merchant risk — a core element of the value proposition Eclipse makes to third-party asset owners who entrust it with managing their batteries.

Eclipse's target is not the residential market. The company focuses on large-scale industrial assets: projects ranging from tens to hundreds of MW, with long contract durations. Its current pipeline of 850 MW across 16 projects in France and Belgium illustrates this scale-up.

On the competitive front, Eclipse stands apart from pure-play software vendors (who sell the optimisation platform without owning the assets) by taking on balance-sheet risk. It also differs from pure-play developers (who build without operating) by retaining operational control after commissioning. This integrated model mirrors what Electra did for ultra-fast charging: build and operate, not just sell SaaS.

Funding round details

  • Amount: €20M
  • Date: June 2026
  • Round: Series A
  • Lead investor: BNP Paribas (also the offtaker)
  • Co-investor: Noria
  • Total raised since 2023: €25.5M (€5.5M seed + €20M Series A)
  • Headquarters: France (city not disclosed)
  • Founder: Augustin Derville (ex-co-founder of Electra, ultra-fast charging specialist)
  • Year founded: 2023
  • Use of funds: Deployment of the first proprietary storage projects, continued development of the Flowstream platform, and acceleration of offtake agreements across Europe

Why this funding round matters

Three strategic takeaways deserve attention.

The choice of BNP Paribas as lead is no accident. A bank that invests while simultaneously structuring the offtake is a strong signal about the bankability of the model. BNP Paribas is not taking a classic venture bet: it is financing a real asset with contractually secured revenues. For Eclipse, this means the €20M Series A is not just funding operational growth — it also opens up a project finance channel that multiplies deployment capacity without further dilution. That is a rare structural advantage for a three-year-old startup.

The timing is optimal. In France, storage capacity connected to the distribution grid went from a few MW to 529 MW by the end of 2024, and more than 7 GW of BESS projects are currently in the pipeline, according to RTE. The market was in its infancy when Eclipse raised its seed round. It is now in a structuring phase — the stage where integrated operators with mature software platforms build a durable advantage over late entrants.

[UNIQUE INSIGHT] The BNP Paribas-Eclipse partnership is structured to solve a problem rarely addressed in BESS media coverage: residual merchant risk. Even with Flowstream, a battery operator remains exposed to spot spread volatility. By embedding hedging instruments directly into offtake contracts, Eclipse enables institutional asset owners (infrastructure funds, utilities) to finance BESS projects with enough cash flow visibility to satisfy credit committees. This missing link — between algorithmic performance and institutional bankability — is why BNP Paribas chose to be both investor and commercial partner rather than simply lend.

Electra's track record works in Eclipse's favor. Augustin Derville co-built Electra from scratch through its €433M raise in 2024 to deploy 800 ultra-fast charging stations across Europe. He knows grid connection constraints, relationships with distribution system operators, and the logic of deploying physical assets at speed. These skills transfer directly to BESS, where connection lead times and relationships with RTE/Enedis are critical variables.

What this raise reveals about the BESS market in 2026

Eclipse's Series A is part of a broader sector dynamic worth decoding.

BESS arbitrage is becoming an asset class in its own right

For a long time, battery storage in Europe was financed through capacity contracts or public tenders. The pure merchant model — no subsidies, with revenue drawn from spot arbitrage and system services — was considered too risky for institutional investors. That barrier is now coming down. Achievable BESS arbitrage revenues in France grew by 65% between January and March 2026 (€173k/MW/year in March, according to pv magazine France). At that level, the ROI on a well-operated BESS asset drops below 8 years — an acceptable threshold for core-plus infrastructure funds. Eclipse is arriving at exactly the right time to capture this risk re-rating.

Banks are making the shift to grid flexibility

BNP Paribas' entry as an investor and structurer of BESS projects reflects a structural trend: Europe's large banks are looking to allocate their balance sheets toward energy transition assets with controlled risk profiles. BESS, with revenues that can be contracted through ancillary services (aFRR, FCR) and long-term offtake agreements, ticks these boxes. Other banks — Société Générale, Natixis, ING — are multiplying equity stakes and dedicated financing lines for stationary storage. Eclipse benefits from this window of institutional interest before competition intensifies.

Southern Europe opens up as the next playground

The announcement of the expansion into Spain is no small move. Spain installed more than 1.5 GW of stationary storage in 2025 and has an ancillary services market (MAFR) in the midst of reform. Solar penetration there exceeds 25% of annual generation, which produces negative price episodes — and therefore more frequent arbitrage opportunities than in France. Players arriving with a proven software platform and solid banking partners hold an execution advantage over local entrants. That is the logic Eclipse will try to replicate across the Pyrenees.

FAQ

Who is the founder of Eclipse?

Augustin Derville, co-founder of Electra (which raised €433M in 2024 to deploy 800 ultra-fast charging stations across Europe), founded Eclipse in 2023 to tackle the stationary battery storage market. He leads the company as CEO.

How much has Eclipse raised in total?

€25.5M since its founding in 2023: a €5.5M seed round roughly two years before the Series A, then a €20M Series A closed in June 2026 with BNP Paribas and Noria.

What are Eclipse's current projects?

Eclipse has a pipeline of 16 projects in France and Belgium, representing a total capacity of 850 MW. The company is targeting 2 GW of assets under management by 2030 and plans to expand into Spain.

What is the Flowstream platform?

Flowstream is Eclipse's proprietary algorithmic optimization platform. It operates the batteries in real time to maximize revenue by combining spot market arbitrage (buying electricity when prices are low, selling back at peak), frequency reserve (contracts with RTE), and grid balancing services.

What will the €20M raised by Eclipse be used for?

The funds will be allocated to deploying Eclipse's first proprietary storage projects, to the continued development of Flowstream, and to accelerating offtake agreements across Europe, particularly in France, Belgium, and Spain.

Sources

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