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Virtual power plants (VPPs) coordinate many small energy resources—such as thermostats, water heaters, EV chargers and home batteries—to help balance the electric grid. A single home usually makes only a modest contribution. Aggregated across thousands of homes and businesses, however, those devices can reduce peak demand, shift electricity use to less congested times or supply stored power. They can provide some services associated with a conventional power plant, but they are not a universal substitute for one—and a smart device is not automatically enrolled or eligible.
What a virtual power plant does
A VPP is a network of distributed energy resources coordinated through software. The resources may be customer-owned equipment, flexible electricity use, or both. Instead of relying only on a large power station, a utility or aggregator can coordinate many smaller resources to respond to grid needs.
For example, during a hot afternoon, an operator might ask participating thermostats to make a modest temporary adjustment, pause or slow some EV charging, schedule water heaters to avoid switching on together, and dispatch home batteries. The combined response can ease a demand peak. A battery may send electricity to the grid; a thermostat generally helps by reducing or shifting consumption. The distinction matters: not every VPP sends household electricity outward.
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The U.S. Department of Energy estimates that commercially available VPP technology represents roughly 30–60 gigawatts (GW) of capacity in the United States. DOE describes 80–160 GW by 2030 as a potential scale-up, associated in its analysis with roughly 10–20% of peak load and about $10 billion in annual grid-cost savings. These are estimates tied to broad deployment, not a live count of committed capacity or a promise of savings on an individual customer’s bill. DOE also compares some VPP peaking capacity with alternatives such as utility-scale batteries and gas peakers, but that does not mean every VPP project costs half as much as every conventional option. DOE’s VPP overview explains the estimates and their context.
How a VPP event works
- Enrollment: A customer signs up through a utility, aggregator, equipment provider or energy retailer and connects an eligible device or system.
- Availability estimate: Software receives permitted device information and estimates how much flexibility the enrolled fleet can provide. A battery’s state of charge, for instance, affects how much it can discharge.
- Dispatch: When a utility, grid operator or program identifies a need, instructions are relayed through the program to participating devices. An event may reduce use, shift it to another time or call for battery discharge.
- Response and measurement: Devices respond within their technical limits. The program measures performance, sometimes against a baseline estimate of what the customer would otherwise have consumed or exported.
- Settlement: Depending on the terms, the customer may receive a bill credit, rebate, enrollment payment or performance-based compensation.
Aggregation is the core idea. A small change from one thermostat may be difficult to use as a grid resource, but many coordinated changes can add up. DOE’s sector overview describes examples such as coordinated EV charging and distributed storage.
Which devices can participate?
Thermostats and HVAC
A program may briefly adjust a thermostat setting or cycle air-conditioning equipment during a peak event. The result can be a small but noticeable comfort change, especially on a very hot or cold day. A thermostat must be supported by the local program; having a connected model or using its manufacturer’s app is not enough. Eligibility may also depend on the HVAC system, internet connection, utility account and rate.
DOE cites Arizona Public Service’s Cool Rewards program as an example: more than 97,500 connected thermostats were enrolled as of November 2024, with the ability to shed more than 160 megawatts during peak events. That is a specific program example, not a typical outcome for every thermostat program. DOE’s 2025 VPP update provides the example.
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Electric water heaters
A water heater can function as a thermal store. A control system may heat water ahead of a peak and pause or reduce heating during it, relying on the tank’s stored heat to meet normal demand. Participation depends on compatible controls, communications, safety limits, household hot-water use and program rules. It should not be assumed that every smart water heater can be dispatched by every aggregator.
EVs and chargers
Managed charging can delay a charge, reduce its rate or move it to a cheaper or less congested period. This is different from sending electricity from the vehicle back to the home or grid. Vehicle-to-home or vehicle-to-grid operation requires a compatible vehicle and charger, suitable software, interconnection arrangements and utility approval. Most EV participation is more likely to involve managed charging than exporting power; not every EV supports bidirectional operation.
Home batteries and solar-plus-storage
A home battery can discharge during peak demand and recharge later. A program may allow the customer to set or retain a minimum backup reserve, but the exact protection varies. Solar panels alone are less dispatchable because their output depends on sunlight. Pairing solar with a battery allows energy to be stored and used or dispatched later, subject to system settings and program terms.
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Buildings and businesses can contribute through HVAC controls, refrigeration, lighting, pumps, thermal storage and flexible industrial processes. These loads can be significant, but their participation must be balanced against operational needs, safety requirements and the cost of changing schedules or output.
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VPPs and demand response: related, not identical
Demand response generally means changing electricity consumption in response to prices, incentives or reliability needs. A VPP is a broader coordinated portfolio that may include demand response alongside batteries, solar, EVs, thermal storage and other distributed resources. A VPP may reduce demand, move it in time, export stored electricity or provide other grid services. In practice, the labels can overlap: a utility demand-response program may be one component of a VPP.
Who controls the equipment?
Control can be provided by a utility, a third-party aggregator, an equipment manufacturer, an energy retailer or a software provider acting for a utility or market participant. It does not always mean that an operator has unrestricted command of a household device. Depending on the agreement, control might mean scheduling a charger, sending a thermostat adjustment, setting an output limit or dispatching a battery only under specified conditions.
Before enrolling, check the actual agreement and app settings. Find out whether you can override an event, how much notice you receive, how long events can last, how many may occur, and whether the program can change a battery’s reserve. Ask what happens if your internet connection or the equipment fails during an event. Some arrangements offer a clear opt-out; others may have limits or payment consequences. Do not assume that all programs provide the same customer controls.
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Program benefits can include equipment rebates, bill credits, annual enrollment payments, per-event or performance payments, lower equipment costs, or other rewards. Some programs pay for available capacity; others calculate payment from measured performance. Maximum advertised compensation is not the same as guaranteed income. The amount can depend on utility territory, device size, event count and duration, measured response, enrollment term and available program funding.
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Examples illustrate how local the terms can be. Tesla’s ConnectedSolutions page describes eligible Powerwalls being dispatched for up to 60 events from June 1 through September 30 in listed program territories, with compensation based on average performance. The page gives territory-specific examples, including a Massachusetts amount of up to about $800 per Powerwall, subject to its conditions. Tesla’s SRP program page lists annual compensation that varies by program terms. Its GVEC program page describes larger incentives for certain qualifying Powerwall 3 installations and a multi-year commitment. These figures are not national VPP rates or guaranteed returns; eligibility, installation dates, performance requirements and terms matter.
Sunrun ConnectedSolutions is another example of a battery-connected grid program, with eligibility tied to the customer’s system and utility. For a different model, OhmConnect describes device-linked energy-reduction participation; its program information says users can earn “Watts” and that joining is free, but consumers should verify current geographic availability and enrollment directly.
Participation also involves trade-offs. Thermostat events can affect comfort, delayed charging can reduce convenience, and battery discharge can leave less energy for a later outage. Event timing may coincide with the day’s hottest hours or an emergency, rather than a convenient period. Baseline-based payments can be affected by weather, occupancy, a vacation or previous conservation. Ask whether equipment or communications failures outside your control affect payment.
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There is no single nationwide sign-up path. Availability can depend on the utility territory, state rules, utility approval, device model, interconnection status, retail rate, program funding and enrollment caps. The same battery or thermostat may qualify in one service area and not in a neighboring one.
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FERC Order 2222 is intended to reduce barriers for aggregated distributed energy resources to participate in organized wholesale electricity markets. It does not create a universal retail VPP program or guarantee that a particular household can enroll. Wholesale-market rules, state and utility requirements, and implementation details still matter. FERC’s Order 2222 explainer also notes that resources compensated through retail programs may face restrictions on wholesale participation.
Do not assume you can enroll the same device in multiple programs. A utility or aggregator may prohibit overlapping enrollment if two programs would control the same equipment or claim the same capacity. Check for conflicts with thermostat demand response, battery export programs, time-of-use rates, solar or battery rebates, emergency programs and retail-provider offers.
Reliability: useful flexibility, not a one-for-one power plant
A VPP can provide meaningful, coordinated capacity, but its output depends on forecasting, communications, weather, customer participation, device availability, battery charge and event timing. Thermostats and chargers can reduce or shift consumption only within practical limits; batteries have finite stored energy; solar output is variable. Local distribution constraints also matter: a resource that helps the wider grid may not solve a specific neighborhood constraint unless it is located and coordinated appropriately.
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For those reasons, VPPs can reduce the need for some peak generation or defer infrastructure upgrades, but they are not interchangeable with a conventional plant in every operating condition. Their value is as one part of a broader grid portfolio, alongside generation, transmission, distribution, storage and efficiency.
Privacy and security questions to ask
A program may collect identifying information, utility account details, energy-use history, device identity and status, battery state of charge, event performance and control records. Review which companies receive that data, whether it is shared or sold, how long it is retained, and whether the aggregator can directly control the device. Also check how accounts are secured, including whether multifactor authentication is available, and what happens to the service and your data if the provider exits the program. Tesla’s program terms for PSE participants, for example, describe sharing personal and energy-use information with utility and program partners.
A practical checklist before enrolling
- Confirm eligibility: Check the official utility or program page for your service address, account type, device model and interconnection status.
- Understand the payment: Separate guaranteed payments from advertised maximums and performance-based amounts. Check the payment schedule, event rules and program funding conditions.
- Set control boundaries: Ask about event length and frequency, advance notice, overrides, opt-outs and any consequences for declining an event.
- Protect household needs: For a battery, confirm the minimum backup reserve and outage behavior. For a thermostat, consider whether event adjustments are acceptable for everyone in the home. For an EV, confirm how charging needs and departure times are handled.
- Read the contract: Check the commitment term, exit conditions, warranty language, responsibility for equipment or network failures, and whether participation changes other incentives or rates.
- Check for double enrollment: Ask whether existing rebates, rates, solar agreements or other demand-response programs conflict.
- Review data terms: Identify what is collected, who receives it, how it is protected and how to revoke access.
- Compare the ordinary value of equipment: If considering a battery, charger or other device, include purchase and installation costs, financing, backup value, bill savings, warranties and expected VPP compensation.
For many customers, the sensible first step is to search the official utility website for “virtual power plant,” “demand response,” “bring your own battery,” “managed EV charging” or “peak rewards.” If you are considering new equipment, it should meet a household need—such as backup power, charging or bill management—even if VPP payments are lower than expected or the program changes.
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