Only the German version of the terms & conditions shall apply. The English version is only a convenience translation.
Version 14.07.2026
These supplementary terms and conditions for the Virtual Power Plant "NeoGrid" of Ostrom GmbH apply in addition to, or as a deviation from, the General Terms and Conditions of Ostrom GmbH for the Supply of Electricity ("Electricity T&Cs") and the General Terms and Conditions of Ostrom GmbH for Smart Integrations.
2.1.1. The prerequisite for concluding a contract for participation in the Virtual Power Plant "NeoGrid" is an ongoing electricity supply contract with Ostrom GmbH, through which a compatible device as described under item 2.3 (hereinafter "the VPP Device") is operated — i.e., electricity must actually be supplied to you under the electricity supply contract at the time of participation.
2.1.2. The Virtual Power Plant "NeoGrid" service is not part of the electricity supply contract and constitutes an optional additional service.
2.1.3. The contract is requested by the customer via the Ostrom App. We confirm receipt of the offer without delay in electronic form (confirmation of receipt). The confirmation of receipt does not yet constitute acceptance of the offer. The contract is only concluded upon receipt of a separate contract confirmation in text form (e.g., by email or in-app notification).
In our Virtual Power Plant (VPP), VPP Devices are connected via our software into a shared power plant, or shared controllable flexibility. This allows us to collectively control the participating VPP Devices, enabling us to sell or purchase the electricity fed in or consumed within the Virtual Power Plant on the intraday electricity markets. This enables us to continuously align charging and, insofar as technically provided for in the VPP Devices and our software, discharging processes with the most favorable prices in intraday electricity trading, thereby optimizing energy costs. Intraday electricity trading can generate additional cost advantages, even compared to optimization based solely on day-ahead prices (SimplyDynamic tariff). We share this additional cost saving with Virtual Power Plant participants as a credit to the Ostrom Wallet (see below for details on compensation).
2.3.1. EV batteries: All owners of electric vehicles of the participating EV brands or wallbox brands can take part in the Virtual Power Plant. A list of participating EV brands and wallbox brands can be found here.
2.3.2. Stationary battery storage systems connected to a PV system: All owners of battery storage systems of the participating battery storage brands with feed-in from a PV system can take part in the Virtual Power Plant. A list of participating battery storage brands can be found here.
2.3.3. In the future, we will progressively expand the Virtual Power Plant to additional brands and decentralized power installations (e.g., heat pumps), as well as stationary battery storage systems without a connection to a PV system.
The customer permits us to control the VPP Devices participating in the Virtual Power Plant for the purpose described in item 2.2, as set out below. This allows us to shift the timing of electricity draw or feed-in.
2.4.1. Charging control of EVs
2.4.1.1. Within the Virtual Power Plant time window, we take over the optimization of the charging processes of the EV battery. The EV is charged according to the desired target state of charge of the battery, which is to be reached by the end of the Virtual Power Plant time window. You can set the desired target state of charge in the Ostrom App under "Electric Vehicle."
2.4.1.2. Virtual Power Plant time window: The time window begins automatically once the following conditions are met: the EV is connected via the charging device at the location of your Ostrom electricity supply contract, and the Virtual Power Plant is activated in the Ostrom App. The time window ends automatically at the end time set by you in the Ostrom App.
2.4.2. Charging control of stationary battery storage systems
2.4.2.1. Within the Virtual Power Plant time window, we take over the optimization of the charging and, insofar as technically provided for in the software, discharging processes of the battery storage system. The optimization takes into account, in particular, household consumption, PV system generation forecasts, the state of charge of the battery storage system, and technical restrictions of the respective battery storage system and connected devices. The aim is to optimize the use of self-generated solar power and the procurement or marketing of energy volumes on the intraday electricity market.
2.4.2.2. Virtual Power Plant time window: The time window begins with the activation of the Virtual Power Plant in the Ostrom App and ends with its deactivation, unless a different time window has been set in the Ostrom App.
To participate in the Virtual Power Plant, the following requirements must be met:
2.5.1. A VPP Device registered for participation in the Virtual Power Plant in the Ostrom App.
2.5.2. Measurement of the consumption and feed-in data of the participating VPP Device via a smart meter, and transmission of this data to us. If you do not yet have a smart meter, you can order one via our website. More information on smart meters can be found here.
2.5.3. A functioning internet connection.
2.5.4. App connection throughout the entire Virtual Power Plant time window: the participating VPP Devices must be connected to our Ostrom App throughout the entire Virtual Power Plant time window so that we can control them. In the case of a battery storage system, the PV system must also be connected to our Ostrom App.
2.5.5. Availability of the VPP Device throughout the entire Virtual Power Plant time window: the control and optimization of the VPP Device during participation in the Virtual Power Plant takes place throughout the entire Virtual Power Plant time window. The VPP Device must therefore be available and controllable at the grid connection point of the location for which the Ostrom electricity supply contract was concluded, throughout the entire Virtual Power Plant time window.
2.5.6. We reserve the right to refuse participation in the Virtual Power Plant if the aforementioned criteria are not met, or in the event of any other breach of contract.
2.6.1. All Virtual Power Plant participants who meet the requirements set out in items 2.5.1 to 2.5.5 receive compensation. This corresponds to the respective participant's share of the trading profit achieved, proportional to the total charging or discharging volume taken into account in each case.
7.2. Our algorithms, as with our existing Smart Charging service, ensure that your electric car is charged during the h2.6.1.1. Total charging/discharging volume taken into account: the total controllable charging volume (charging from the grid) and the total controllable discharging volume (charging into the grid) of the VPP Devices participating in the Virtual Power Plant are calculated separately within the respective Virtual Power Plant time window.ours with the lowest day-ahead prices, resulting in the lowest charging costs for you under the dynamic tariff.
2.6.1.2. Trading profit achieved: the difference between the price achieved by us in intraday electricity trading and the customer's billing price under the Ostrom electricity supply contract.
2.6.1.3. Proportional participant share: 50% of the trading profit achieved is distributed among participating customers in proportion to their share of the total charging/discharging volume taken into account, and credited as compensation.
2.6.2. The compensation is credited to your Ostrom Wallet. The credit is issued daily for the compensation achieved in the preceding 24 hours. In the Ostrom Wallet, you can have the compensation offset against your next invoice or use it for purchases in the Ostrom Store.
2.6.3. Virtual Power Plant participants who do not fully meet the requirements set out in items 2.5.1 to 2.5.5 do not receive compensation.
2.7.1. Billing for electricity consumed is carried out according to the tariff of your Ostrom electricity supply contract; billing, where relevant, for fed-in electricity volumes is carried out according to your feed-in agreement or your statutory feed-in tariff (hereinafter, in each case, the "Tariff").
2.7.2. Our algorithms take into account (as with our Smart Charging Service product) that the VPP Devices participating in the Virtual Power Plant are optimized during the most favorable hours, thereby keeping your energy costs as low as possible. We may deduct from the compensation determined under item 2.6 any additional costs arising from a shift of charging times to periods that are less favorable under your Tariff. As a rule, the remaining compensation exceeds these additional costs, so that overall a credit is applied to your Ostrom Wallet.
2.7.3. The compensation under item 2.6 is independent of the billing of the Ostrom electricity supply contract and is credited to the Ostrom Wallet.
2.8.1. A reporting feature for the Virtual Power Plant is provided in the Ostrom App. This is available to you for viewing in the Ostrom App.
2.9.1. Flexible enrollment and cancellation of participation in the Virtual Power Plant takes place via the Ostrom App for the respective participating VPP Device.
2.10.1. The contract for the Virtual Power Plant "NeoGrid" runs for an indefinite period. The customer may deactivate participation at the device level in the App at any time; in addition, the customer may terminate the Virtual Power Plant "NeoGrid" as a whole at any time in text form, subject to four weeks' notice.
2.10.2. Ostrom may terminate the Virtual Power Plant "NeoGrid" in text form, subject to four weeks' notice; the right to extraordinary termination for good cause remains unaffected.
2.10.3. Furthermore, the Virtual Power Plant "NeoGrid" ends automatically, without requiring termination, if one of the participation requirements under 2.5 permanently ceases to be met.
2.11.1. Ostrom GmbH shall not be liable, regardless of legal grounds, for damages, in particular those that may arise from the control and optimization of the participating VPP Devices.
2.11.2. This limitation of liability does not apply to damages:
2.11.2.1. caused intentionally or through gross negligence by Ostrom GmbH, its legal representatives, or vicarious agents;
2.11.2.2. resulting from injury to life, body, or health; and
2.11.2.3. in the case of slight negligence, where a material contractual obligation has been breached by Ostrom GmbH, its legal representatives, or vicarious agents. In this case, liability is limited to the foreseeable damage typically to be expected. Material obligations are those obligations that form the basis of the cooperation under this contract and on whose fulfillment the customer may rely.