Enersee: Meter anomaly detection and savings tracking for large building portfolios

Overview

Enersee was founded in Antwerp in 2020 and sells its analysis as a 'Virtual Energy Manager': software plus a customer success contact who onboards each portfolio from a master data spreadsheet.

Enersee makes no meters, gateways or controls. It sits above whatever already collects the data, whether that is a building management system, an existing energy management platform, the utility's meter data or a metering partner, and takes readings at 15-minute or hourly resolution over MQTT, SFTP or an API (onboarding requirements). It competes with the analytics layers of other European energy management platforms, not with BMS or monitoring hardware suppliers, and its pitch is that most of those platforms stop at dashboards and alarms that nobody has time to read.

It was registered as Eneos, took the Enersee name in 2023 and raised €4 million in September 2025 in a round led by 6 Degrees Capital (press release). Its best-documented deployment is Delhaize Belgium, which chose Enersee for its network of about 700 stores in November 2024, as reported in the Belgian trade press (Made in). The Flemish public employment service VDAB publishes a case study on running it across 140 sites as part of its ISO 50001 energy management system (VDAB case study).

Offering

Software tiers

Enersee sells three tiers on its pricing page, with no prices shown:

• EnerCore: one data foundation for the portfolio. Data centralisation and standardisation, data quality monitoring and validation, organisation and building overviews, asset management and standard benchmarking reports.
• EnerScale: everything in EnerCore plus round-the-clock anomaly detection with prioritisation, an investigation and resolution workflow with ticketing, projects suggested by Enersee and a management report on those projects. The company marks this as its most popular tier.
• EnerPro: automated root-cause analysis, advanced performance reports with a report editor, an ISO 50001 compliance module and more advanced project suggestions.

Three add-ons sit on top: the ISO 50001 compliance module (tracking of significant energy users, gap analysis and documented savings), compliance guidance from Enersee's own experts, and a senior energy manager from Enersee or a partner placed inside the customer's organisation. Every tier includes onboarding and a customer success contact.

Modules

The product page groups the platform into three modules. Operations detects consumption anomalies and ranks them by cost. Management tracks energy projects such as retrofits, LED relamping or HVAC replacement against a trained baseline, following IPMVP principles. Impact covers the sustainability roadmap: carbon scenarios for scope 1, 2 and 3, progress against targets, and which buildings to invest in, retrofit or sell. The home page adds ISO 50001, CSRD and statutory reporting, tenant invoicing built from meter data, and budgets and forecasts that check supplier invoices before they are paid.

Enersee Connect

Enersee Connect is the data layer underneath. It brings in BMS, utility, AMR/AMI, IoT and MQTT sources, validates them, applies conversion factors, tracks lineage across meter changes, and passes both batch and live data on through APIs to Enersee and other systems. Integration partners use it to set up and monitor customer data pipelines.

Partners

The partner programme has two routes: integration partners who connect meters, gateways and building systems, and service partners, typically energy consultancies, who run savings programmes for their own clients on Enersee. The Idealists, Bacbee and Oktow are quoted on that page as partners.

Technology

How the analytics work

Every meter gets its own baseline model. Enersee's anomaly article says the model is trained on 12 months of history against more than 20 weather variables (temperature, humidity, solar radiation and others), time of day, day of week and time of year, plus site variables such as occupancy where the customer has them. The onboarding guide sets nine months per meter as the minimum and a full year as the ideal. Anomaly detection is not switched on for a meter until that history is loaded.

Detection uses a cumulative sum (CUSUM) of the gap between actual and baseline consumption. An anomaly is a break in that trend, a change in how the meter behaves, rather than a reading above a fixed threshold, which is the design choice meant to cut the false alarms of threshold-based systems. The impact of each anomaly is the shift between the period before and after it, in kWh per day, multiplied by the customer's configured price per kWh. Anomalies move through statuses from New to To Be Identified to Solved, and the platform has three roles: admin, energy manager or analyst, and read-only (getting started).

The projects module trains a separate baseline on a reference period of at least nine months before an intervention, excludes the works period, and reports weather-corrected savings, payback and ROI from the entered investment cost. Enersee says its models have been scored as world-class in the Efficiency Valuation Organization's M&V testing portal (how it works).

Data in

Onboarding needs two things. The first is a master data file, a spreadsheet of buildings (function, gross internal area to IPMS 2, solar, CHP, EV charging, address), meters (identifier, category, utility type of electricity, gas, water or thermal energy, 15-minute or hourly resolution, unit of kWh, m³ or litres, and whether the meter is interval, cumulative or instantaneous) and users. The second is the time series itself, which reaches Enersee by one of four routes: pushed over MQTT, SFTP batch files or an API, or pulled by Enersee through the API of an existing EMS (onboarding guide).

The MQTT connector is documented in full. Partners publish to a hosted broker over TLS on port 8883, authenticated by a username and a password issued by Enersee, at QoS 1 or 2, on topics of the form partner/customer, with the meter identifier as an optional last level. Each JSON message carries one flat measurement with a Unix or ISO 8601 timestamp. Readings must sit on a 15-minute or hourly boundary (a value stamped 12:17 is rejected) and are sent every 15 or 60 minutes. The sender is asked to buffer 30 days of data and resend the previous 24 hours once a day. Building and meter metadata never travel over MQTT; they come from the master data file.

The home page shows Siemens, AVEVA, Honeywell, Johnson Controls, Priva, Fluvius, Microsoft Azure and AWS as data sources. The public roadmap listed direct meter data access from grid operators as in progress in July 2026, with self-service push or pull connections for customers' own meters next.

Hosting and security

The privacy policy says all data is stored on Google Cloud Platform in Belgium, and points to Google's ISO 27001, 27017 and 27018 certifications; Enersee publishes no security certification of its own. Under its terms the customer owns its data, Enersee may use it in anonymised or aggregate form to improve the product, and Enersee's liability is capped at the previous 12 months' fees and €250,000 in total. Engineering job adverts describe a Python stack for the connectors and the models (Time Series Data Engineer).

Customers

Delhaize Belgium

In November 2024 Delhaize Belgium agreed to roll Enersee out across its network of about 700 stores, including affiliated and franchised stores, to cut energy waste and CO₂ emissions and to prepare stores for Flanders' EPC NR certificate for non-residential buildings (Enersee press release; Buurtsuper). Delhaize's energy and engineering manager, Ruben De Vos, gave benchmarking of refrigeration and heating efficiency against comparable stores as the reason. Enersee's September 2025 release says one store's monthly energy bill fell from €20,000 to €12,000 after refrigeration settings were corrected. The release calls that a 35% cut; the two figures work out at 40%, which is the number the lead investor gives (6 Degrees Capital).

VDAB

VDAB, the Flemish public employment service, runs about 140 sites and 400,000 m² of offices, training centres and public buildings. According to the case study it evaluated 15 vendors in a formal tender, moved to 15-minute data across the portfolio for ISO 50001, and chose Enersee as its analytics layer. Its head of environment and energy singles out detection of energy use outside operating hours and portfolio benchmarking, and reports that 2025 efficiency projects saved 30% more than forecast, an ROI of 162%. The 55% cut in primary energy the case study also quotes is measured from 2005, well before Enersee existed.

Other customers

Enersee's September 2025 release describes an unnamed German discount retailer where it found 12 times as many anomalies as manual methods. The lead investor reports a customer pilot with 3.6 anomalies found per store against 0.27 under the customer's existing EMS process, 85% of them confirmed as real against 20% before, and savings the customer put at €3.5 million a year per 1,000 stores (6 Degrees Capital). The same post names the Port of Antwerp, Center Parcs and Korian care homes as users. The Enersee website shows the logos of bpost, Veolia, UCLL, the city of Hasselt, Van Roey Services, Armonea, Korian and Belfius (about).

The company reports more than 1,000 sites under management (home page).

Markets

Enersee is a Belgian business first. Its offices are in Antwerp and Brussels, it invoices in euro under Belgian law (terms), and most named customers are Belgian: Delhaize Belgium, VDAB, bpost, Belfius, the city of Hasselt and UCLL. The lead investor says the platform is also used in the Netherlands, France, the UK and Scandinavia (6 Degrees Capital), and the €4 million raised in 2025 is earmarked for international rollouts (press release).

Its target is the organisation that runs many sites with a small central team. The website has pages for real estate, retail, supermarkets and banking and insurance, and the 2025 release names healthcare, education, logistics and pharma as growth segments. Supermarkets are the strongest reference: the supermarket page is built around refrigeration, ventilation and distribution centres, and both the Delhaize rollout and the German discount pilot are grocery retail.

Regulation drives much of the selling. Enersee publishes guides for building automation and control system (BACS) rules in Flanders, the Netherlands and France. The Flemish page says non-residential buildings with more than 290 kW of heating or cooling need a BACS from 31 December 2025, and that the rule comes from the EU Energy Performance of Buildings Directive (BACS guide). A separate page positions the product for ISO 50001 under the Energy Efficiency Directive (ISO 50001 page).

It sells direct, with a customer success manager on every account, and through a partner programme of integrators who connect meters, gateways and building systems and consultancies who run the platform for their own clients (partners).

Company

Enersee BV is a Belgian private limited company, enterprise number 0753.461.158, registered on 30 August 2020. It traded as Eneos and Eneos.cloud; the registered name became Enersee on 11 March 2024, and the registered seat has been Boulevard du Roi Albert II 4 in Brussels since the same date (Crossroads Bank for Enterprises). The public rebrand came earlier, with the seed round in June 2023 (Tech.eu). The company's own site names Zénobe Grammestraat 34, Antwerp as its headquarters, with a second office at Silversquare Brussels North (home page), and LinkedIn also gives Antwerp. LinkedIn and EU-Startups date the founding to 2021, the year the registry shows Joachim Vleminckx joining the board.

The founders are Joachim Vleminckx, chief executive, and Maarten Van de Vijver, chief technology officer (about). According to the lead investor, Vleminckx previously built digital automation for large enterprises including Johnson & Johnson, GSK and BASF, and Van de Vijver was a technical energy consultant working on data analytics and modelling, with a degree in bioscience engineering from Ghent University (6 Degrees Capital). The registry lists three further directors: Stefan Bary since April 2023, and Bert Baeck and Lucas Stoops since August 2025. Stoops is a partner at 6 Degrees Capital.

Enersee has raised €5.2 million in two announced rounds. Peak, the Dutch venture firm, led €1.2 million in June 2023, when it said the founders had signed customers with a combined portfolio of 1,510 buildings (EU-Startups). 6 Degrees Capital led €4 million in September 2025, with Peak and the angel investors Alex Brabers, Bernard Hazard, Laurent Michiels and Vincent Nagels (Peak). The 2025 money goes on customer success and product teams and international rollouts; the stated roadmap adds tariff-normalised cost views, solar and battery modules and automated dispatch of contractors to fix what the platform finds.

LinkedIn shows 22 employees in September 2026 (LinkedIn). The company has been registered as an employer since September 2023.