gridX: White-label energy management for homes and EV charging sites in Europe

Overview

gridX was founded in 2016 and is registered in Aachen, with a second office in Munich, according to its imprint and a 2024 company release. Its about page traces the idea to 2015. The company began working with E.ON in 2017; E.ON bought a majority stake in September 2021 and took full ownership after the founders handed over their remaining shares, as energate messenger reported in December 2022.

What sets gridX apart is its route to market. It does not sell to households or building owners. It builds the platform and gateway, and utilities, device makers, installers and charge point operators put their own brand on the result. E.ON's German retail business, Essent in the Netherlands, Viessmann and IBC Solar all run products on it, according to its success stories.

The second distinction is how closely the product follows German energy regulation. gridX shipped a module for §14a EnWG grid-operator dimming signals in November 2024 and implemented the §9 EEG feed-in cap in 2025, and Energías Renovables reported the company's claim to be among the first to offer it in an integrated form for German homes. Since 2025 the focus has shifted toward pooling the flexibility of home batteries and EV charging for energy trading.

Offering

The core product is XENON, a cloud platform with three faces: an operator dashboard for running fleets of homes and charging sites, an installer hub for commissioning and troubleshooting, and an end-user app that a partner can rebrand or fold into its own app.

Home energy management

For homes, gridX sells four bundles. Connect links devices through the gridBox or a cloud connection. Control adds device steering. Optimize schedules EV charging, heat pumps and batteries against dynamic tariffs and time-variable grid fees, which the company says is worth up to €400 a year per German home from tariffs and up to €600 more from grid-fee optimisation under §14a Module 3 (company estimates for 2026). Flex pools assets for trading, and a white-label direct marketing product for rooftop PV is planned for 2027.

EV charging infrastructure

The same four steps apply to charging sites: dynamic load management, peak shaving and pooled flexibility. In September 2026 gridX launched a product that aggregates flexibility from AC, DC and megawatt truck charging, without vehicle-to-grid, for sale on wholesale and imbalance markets.

Gateway and API

The gridBox is gridX's own gateway, built and configured in Aachen. The Energy API lets partners build their own applications on XENON. Pricing is not published; contracts are with resellers.

Technology

XENON combines cloud services with a local gateway. The gridBox connects over Ethernet, carries 1 GB of RAM, samples data at intervals down to 200 ms, records about 2.5 million data points a day and keeps controlling devices for up to 10 days without a cloud connection. It is updated over the air and uses TLS 1.3. Smart meter control signals are processed locally, which is how the §14a EnWG functions work without depending on the cloud. For households with a single asset, gridX also offers cloud-to-cloud connections.

Devices and protocols

The integrations page, dated 5 March 2026, lists 66 manufacturers across PV inverters, home batteries, heat pumps, meters and AC and DC chargers, and names four protocols: EEBUS, Modbus, OCPP and SG Ready. Each integration has a scanner that finds the device, a monitor that normalises its readings and a controller that sends set-points. The page does not say which protocol each device uses. Sigenergy's integration, for example, runs over Modbus, and Bender's compatibility table lists the gridBox as an energy manager over Modbus TCP with a TQ EM420 meter.

Grid signals

The Grid Signal Processor takes dimming signals from control boxes over EEBUS and limits devices above 4.2 kW, while drawing on PV and battery power to keep the home running. Control boxes from PPC and Theben were tested at launch; gridX said in November 2024 that its EEBUS qualification was still under way.

API and security

The Energy API uses HTTPS with JSON, role-based access and webhooks, and the company reports about 50 million calls a day. Data is hosted in Germany. The company reports a CyberVadis score of 895/1000 and plans ISO 27001 certification in 2026.

Customers

gridX publishes 24 success stories, almost all naming the customer. They fall into four groups.

Utilities and retailers

E.ON Energie Deutschland offers a home energy management system built on gridX, and E.ON Drive uses XENON to scale charging at business sites. Essent in the Netherlands runs Slim Laden, a cloud-based smart charging service the company says saves users up to €300 a year. MAINGAU Energie and Electris are also listed.

Device makers and installers

Viessmann used XENON in its move into energy services and IBC Solar built its efa:home product on it. Soly, Klarsolar, heimWatt and greenblocks run home energy products on the platform. ADS-TEC Energy uses it for battery-backed fast charging.

Charging and fleets

Fastned uses gridX for grid-compliant load management across its fast-charging sites, alongside ChargeOne, eliso, Goldbeck and SMART/LAB. Fleet operators include DHL, Swiss Post and Austrian Post. A 2021 legal announcement also named ENGIE as a customer.

Grid operators

Westnetz, a German distribution grid operator, uses smart grid control to integrate EV charging. Most stories describe the deployment rather than measured results; Essent's saving is the main quantified outcome.

Markets

Germany is the home market and the one the product is most closely built around, with features for §14a EnWG, §9 EEG and German dynamic tariffs and grid fees. The company reports 12 active countries on its homepage. In January 2024 it said that more than half of the partnerships it signed in 2023 were outside Germany, with activity in the Netherlands, Spain, Scandinavia, Italy and the UK and new long-term partnerships in Switzerland and Spain.

The buyers are businesses that serve end users: energy retailers and utilities, energy scale-ups, large installers, charge point operators, B2B resellers and e-mobility providers. Fleet operators and logistics companies buy the charging products directly.

Device makers are a channel of their own. The Ready for gridX programme certifies connectivity between an OEM's devices and the platform; Sigenergy became its seventh international OEM in July 2026, joining KOSTAL and Huawei. Installer networks are another route: the press archive records PV Green's installer network fitting gridX's white-label system in Germany from July 2026.

Company

gridX GmbH is registered at the Aachen local court under HRB 20494, with its registered office in Aachen and a second office in Munich, according to its imprint. The company says it was founded in 2016; the IoT M2M Council gives the same year.

Ownership

E.ON and gridX started working together in 2017. On 24 September 2021 E.ON acquired a majority stake, with the founders staying on as managing directors; the price was not disclosed. In December 2022 E.ON announced it was taking the remaining shares. energate messenger reported that the founders would transfer their minority holdings on 1 April 2023 and leave management, and Startbase reported the same deal. gridX kept its brand and runs as an independently managed portfolio company within E.ON.

Management changes

The founders' departure in 2023 was followed by another change in September 2025, when the technical managing director moved to become chief information officer of E.ON's German sales business. The company said at the time that its technology forms the core of E.ON's planned home energy management solution and that it would expand its management team. Headcount is not published.