Key facts
- Virtual power plants (VPPs) aggregate distributed energy resources like home batteries and smart thermostats to act as a single power plant.
- VPPs can discharge stored electricity or reduce demand to balance supply and demand on the grid.
- The U.S. Department of Energy estimates VPPs can provide peaking capacity at roughly half the net cost of utility-scale batteries or new gas peaker plants.
- A VPP made up of residential thermostats, water heaters, EV chargers, and home batteries could provide peaking capacity at roughly half the net cost of a utility-scale battery or a new gas peaker.
- The U.S. Department of Energy estimates that tripling U.S. VPP capacity to 80 to 160 gigawatts by 2030 could save about $10 billion a year in grid costs.
On the evening of September 9, 2026, over 140,000 home batteries across California simultaneously discharged more than 580 megawatts of power into the state's grid during a three-hour window, an amount comparable to a large conventional power plant's output. This event, occurring without new construction or fuel consumption, highlights the growing role of virtual power plants (VPPs) as a critical grid management tool.
Power demand is increasing due to factors like AI data centers, electric vehicles, and heat pumps. Simultaneously, geopolitical events, such as the 2026 Strait of Hormuz crisis, underscore the vulnerability of fuel-dependent power systems. Grid operators require additional capacity rapidly, a need that new power plants and transmission lines struggle to meet in terms of speed.
A VPP is defined as a network of small, distributed energy resources, including home batteries, smart thermostats, EV chargers, rooftop solar, and flexible commercial equipment. These resources are coordinated by software to function as a single power plant, capable of injecting electricity into the grid, reducing demand, or both, when needed.
Unlike traditional power plants that are centralized, VPPs aggregate thousands or even hundreds of thousands of small, existing resources spread across numerous locations. The "virtual" aspect refers to the plant's distributed nature, not the electricity itself. The U.S. Department of Energy views VPPs as aggregations of distributed energy resources that provide grid services akin to traditional power plants, with the key distinction being their dispatchability and payability by grid operators.
How VPPs operate involves three layers: the devices themselves (owned by homeowners or businesses, or leased), the aggregator (a company managing the software, forecasting capacity, and signaling devices), and the grid operator or utility (the buyer of these services). During peak demand events, aggregators may pre-cool homes or ensure batteries are charged, then dispatch devices to discharge power or reduce consumption. Participants are compensated through bill credits, payments, or better tariffs, often without noticing the event.
Common VPP components include home and business batteries, smart thermostats, electric water heaters, EVs and chargers, rooftop solar with smart inverters, commercial and industrial loads, and small generators. VPPs can be categorized by their primary function: demand reduction (thermostats, industrial loads) or supply addition (battery fleets, pooled generators), with many newer VPPs performing both. In North America, demand response and commercial/industrial loads are prevalent, while home batteries are gaining prominence.
VPPs are particularly effective at specific, high-cost grid functions. They can cover peak demand without the need for expensive peaker plants, which are often idle. The Department of Energy estimates that VPPs composed of residential devices could provide peaking capacity at about half the cost of utility-scale batteries or new gas peaker plants. The speed at which VPPs can be deployed, using existing devices, is a significant advantage over the years required for traditional power plant construction. The DOE projects a substantial increase in U.S. peak demand by 2030, driven by data centers, manufacturing, and electrification, further emphasizing the need for rapid capacity solutions like VPPs.