French energy technology company Entech has signed a contract worth nearly €40 million to deliver a 90 MW / 180 MWh battery storage plant for an unnamed electricity producer in mainland France. Announced on October 15, the award is the company's largest engineering, procurement and construction contract as sole contractor. The battery is only part of the assignment. Entech will also build the associated high-voltage substation that connects the plant to RTE's 90 kV transmission network. That bundled scope makes the announcement a useful measure of where storage competition is heading: toward responsibility for a complete, grid-connected asset rather than a shipment of battery containers. Contract at a glance 90 MW Contracted battery power, with 180 MWh of energy capacity. 2 hours Nominal duration calculated from the announced ratings. Source: Entech, October 15, 2026. Hero: AI-generated conceptual illustration, not the actual project. What the contract actually covers Entech says it will manage the project from design through commissioning, including preliminary studies, subcontractor selection and supervision of all works. The customer wanted a single point of contact for the entire development. A renewable five-year operations and maintenance contract will accompany the operating phase. The release identifies the customer only as a major electricity producer in mainland France. It does not disclose the project location, a construction start date, a commissioning target or the battery supplier. Nor does it specify cell chemistry, a contracted revenue arrangement or the eventual operating strategy. Those omissions matter: a signed EPC award is evidence of commercial commitment, not evidence that the plant is already built or producing revenue. The published ratings imply a nominal two-hour duration, calculated by dividing 180 MWh of energy capacity by 90 MW of power. Actual delivered duration will depend on the contractual measurement boundary, usable state-of-charge range, auxiliary consumption and operating limits. The announcement does not provide those performance details, so the nameplate ratio should not be mistaken for a verified grid-export guarantee. Why the 90 kV substation belongs in the headline A battery storage plant must do more than charge and discharge cells. Power conversion equipment, transformers, protection systems, communications and controls have to operate together at the network connection point. Including the high-voltage substation in the EPC scope gives one contractor responsibility for a larger share of that interface. For a buyer, the practical attraction is fewer contractual boundaries. If the battery supplier, civil works contractor and substation builder are engaged separately, a commissioning delay can produce arguments about which package caused it. A sole EPC contractor can simplify coordination and give the owner one party to pursue for delivery obligations, although the precise allocation of liabilities still depends on contract terms that Entech has not published. The arrangement does not remove the network operator's role or guarantee a connection timetable. RTE's requirements, testing and network readiness remain separate technical realities. What changes is who has to coordinate the plant-side work. For a 90 MW installation, that distinction can be as important to the owner as the brand printed on the battery enclosure. Reading the €40 million figure carefully Dividing the approximate contract value by 180 MWh gives a rough EPC value of €222 per kWh of rated storage capacity. That is a calculation from the headline figures, not a disclosed battery equipment price. The value is approximate because Entech describes the award as nearly €40 million, and the scope includes high-voltage infrastructure as well as the storage plant. It would be misleading to compare that number directly with a factory-gate battery pack price or a container-only supply offer. Grid works, site design, construction, commissioning and contractor risk can change the cost boundary substantially. The release also does not separate the EPC amount from the commercial value of the accompanying maintenance arrangement. The useful comparison for another developer would be a similarly scoped French project with comparable connection voltage, site conditions, performance obligations and procurement timing. Without those details, this contract is stronger evidence of Entech's ability to win a larger turnkey assignment than it is a benchmark for what every European battery project should cost. A two-hour asset still needs a business model The specified duration places the project in the short-duration battery category, capable in principle of moving electricity between nearby periods and responding quickly to changes in system conditions. Such systems can support several kinds of grid and market services. The release, however, does not identify which services this particular customer will pursue or how its capacity will be allocated. That distinction prevents a common leap in storage reporting. Building a battery does not establish a guaranteed arbitrage margin, an ancillary-services award or a long-term capacity payment. A plant's earnings depend on market access, dispatch decisions, charging costs, availability and the contractual obligations it accepts. None of those revenues should be inferred from the EPC announcement alone. Operating strategy also affects wear and performance. Frequent cycling can consume warranty allowances differently from holding energy in reserve, while keeping headroom for a grid service can reduce the energy available for trading. Buyers therefore need the delivery specification, control system and warranty conditions to match the intended business model before commissioning, not after the asset enters service. Maintenance puts attention on the years after handover The renewable five-year O&M agreement extends the relationship beyond the construction milestone. In a battery plant, maintenance can involve thermal management, power electronics, protection equipment, monitoring systems and scheduled inspections as well as the cells themselves. The announcement does not list the service package, availability commitments, exclusions or pricing. Five years of maintenance should not be read as a five-year battery life, a full-system warranty or a promise of free future capacity replacement. These are different commercial concepts. Degradation guarantees, augmentation provisions and responsibility for spare parts need their own definitions. An owner evaluating this structure would want to know how the maintenance contract interacts with supplier warranties and the plant's agreed performance tests. For Entech, the deal increases the importance of project execution alongside order intake. A larger sole-contractor role means managing subcontractor interfaces and delivery obligations across more of the installation. The company's claim that it can handle projects of increasing size will be tested through construction progress, commissioning and operating results, not simply through the size of this announcement. The next evidence to watch The next material disclosures would be a named site and customer, an equipment selection, an execution schedule and confirmation of commissioning. Those details would make it possible to assess whether the announced scope is progressing toward an operational asset and how its two-hour design fits the customer's broader electricity portfolio. For now, the news is specific and bounded: a French producer has chosen Entech to deliver a 180 MWh battery with the associated transmission substation under one EPC contract. The combination of electrical infrastructure and storage delivery is the distinguishing feature. More battery capacity is promised, but the immediate commercial development is a bigger single point of accountability for getting it onto the grid. The bottom line: Entech's nearly €40 mill