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# Field digest — the grid's new machines: virtual power plants in 2026
2026-09-20 · ebungo · field research — a companion to the homelab-watt digest: my watts, everyone's watts
On June 24 2026, three energy firms announced an agreement to deliver up to 16.8 GW of flexible power to hyperscalers and utilities — a virtual power plant built from batteries, thermostats and car chargers sitting inside American homes.[1] Sunrun, Tesla and Renew Home will link roughly 12 million household devices into a single dispatchable resource, and more than 300 MW already sit ready near Virginia's "Data Center Alley".[2] Sunrun's chief executive put the mismatch bluntly: "a grid built in the 1800s cannot power the innovation of 2026."[2]
## What the 16.8 GW actually is
The program's capacity breaks down as slightly more than 9 GW of smart thermostats and 7.8 GW of batteries, drawn from as many as 12 million existing devices at 9 million customer homes across the United States, including Alaska, Hawaii and Puerto Rico.[1] The companies split the capacity into three regions: 6.2 GW in the west including Hawaii and Alaska, 4.6 GW in central states, and 6 GW in the east including Puerto Rico — and just four places account for over 50% of the total: California, Texas, Puerto Rico and Florida.[1] California alone represents 4.66 GW (27.7%) of program capacity, including 46% of all the batteries.[1] Taken together it would be the largest VPP in the United States.[1]
Scale is not the only claim. The aggregations could be deployed within months of deals being signed, "requiring no additional hardware, software, interconnection, water, or land usage for offtakers."[1] Direct payments are the point for households that participate — the companies say they paid more than $67 million to such households in 2025.[1] For data center operators, the value is a quick way to account for their effect on grid capacity that can be less expensive than paying for a grid upgrade.[1]
## The household side is already live
California's Demand Side Grid Support (DSGS) program pays Powerwall owners "up to $280 a year per Powerwall" to be dispatchable on summer evenings.[3] Tesla calls the VPP "when wholesale electricity prices exceed $200/MWh" — events run May through October, 4 PM to 9 PM, never longer than two hours.[3] The July 2025 evidence of delivery: California VPPs delivered more than 535 MW to the grid, with Powerwall households providing nearly 500 MW — "enough capacity to power half of San Francisco."[5] In Puerto Rico, Tesla's VPP delivered 40–50 MW during grid emergencies and peak demand periods, helping the utility avoid load shedding.[5]
## The UK turned flexibility into a market
Britain's Demand Flexibility Service (DFS) has been a formal household flexibility programme since winter 2022/23; in its first two winters it engaged approximately 4.2 million homes and businesses, cutting more than 7 GWh of peak electricity use.[4] From November 2024 the DFS became a permanent, year-round in-merit service, and in April 2026 it expanded to bidirectional flexibility — batteries and V2G chargers paid to both absorb surplus generation and release stored energy — while lowering the minimum participation threshold to 0.1 MW so small aggregators could bring residential assets in.[4] Octopus's platform Kraken now manages over 2 GW of connected green devices in the UK.[4] Tesla is entering the retail ring too: in March 2026 Ofgem granted Tesla Energy Ventures a full electricity supply licence, enabling it to operate Tesla Electric UK.[4]
## The rules now tell states to build VPPs
The regulatory layer moved in 2026. Illinois signed the Clean and Reliable Grid Affordability Act (S.B. 25) on January 8 — effective June 1 2026 — requiring utilities to create VPP programs that aggregate customer-side resources (smart thermostats, small batteries, rooftop and community solar, EVs) and pay participating customers for grid services during peak periods.[6] New Jersey's Governor Sherrill issued Executive Order No. 2 on January 20 directing the Board of Public Utilities to accelerate storage deployment and develop a VPP program to aggregate behind-the-meter resources; the Board's RFI followed February 3.[6] Virginia's Dominion Energy filed for a VPP pilot under the Community Energy Act on December 1 2025.[6]
## The honest caveat
"Coordinating thermostats and car chargers at this scale has never been tried in America, and software glitches or opt-outs could shrink the promised 16.8 gigawatts considerably."[2] The direction, though, has shifted: grid planners once filed distributed energy under "nice to have"; they are now filing it under necessary.[2]
## Sources
[1] [pv magazine USA: Sunrun, Tesla, Renew Home 16.8 GW VPP program](https://pv-magazine-usa.com/2026/06/25/sunrun-tesla-renew-home-announce-plans-for-16-8-gw-virtual-power-plant-program)"The overall 16.8 GW of capacity would be made up of slightly more than 9 GW of smart thermostats and 7.8 GW of batteries." "The companies say the VPPs it deploys under this framework could include as many as 12 million existing devices located at 9 million customer homes across the United States, including Alaska, Hawaii and Puerto Rico." "California alone represents 4.66 GW (27.7%) of the total program capacity, with 1.05 GW of that capacity from HVAC and 3.61 GW from batteries, for 46% of all battery capacity in the program." "Taken together, the 16.8 GW of combined capacity would make the Tesla/Sunrun/Renew Home VPP program the largest in the United States." "In addition, they promise direct payments for those residential customers who allow their devices to participate in the programs, and say they paid more than $67 million to such households in 2025." "The value offered to data center operators by the Tesla/Sunrun/Renew VPP is a quick way to account for their effect on the capacity of the grid that has the potential to be less expensive than paying for grid upgrade."
[2] [Virtual Power Plants Summit: Nine Million Homes Just Joined the Power Grid](https://www.virtual-power-plants-summit.com/news/nine-million-homes-just-joined-the-power-grid)"Sunrun, Tesla and Renew Home will link roughly 12m household devices, among them batteries, thermostats and car chargers, into a single dispatchable resource with 16.8 gigawatts of capacity." "More than 300 megawatts already sit ready near Virginia's "Data Center Alley," a stretch of northern Virginia thick with server farms." "a grid built in the 1800s cannot power the innovation of 2026." "Coordinating thermostats and car chargers at this scale has never been tried in America, and software glitches or opt-outs could shrink the promised 16.8 gigawatts considerably." "Grid planners once filed distributed energy under "nice to have." They are now filing it under necessary, and the pace of that shift has caught most forecasters off guard."
[3] [Tesla VPP With DSGS (California)](https://www.tesla.com/support/energy/virtual-power-plant/dsgs)"Enroll your Powerwall in the Tesla Virtual Power Plant with the CEC’s DSGS framework to support California's energy grid during critical times and earn up to $280 a year per Powerwall." "Once you are enrolled in the program, Tesla will call upon the virtual power plant when wholesale electricity prices exceed $200/MWh." "You can expect events to occur between May and October, from 4 PM to 9 PM. Events will be no longer than two hours."
[4] [Smart Solar Homes: Virtual Power Plants UK](https://smartsolarhomes.co.uk/articles/virtual-power-plants-uk)"In its first two winters the service engaged approximately 4.2 million homes and businesses, cutting more than 7 GWh of peak electricity use." "From November 2024 the DFS was restructured as a permanent, year-round in-merit service." "the service expanded in April 2026 to include bidirectional flexibility — meaning batteries and V2G chargers can be paid to both absorb surplus generation and release stored energy." "The minimum participation threshold was simultaneously lowered to 0.1 MW, making it much easier for small aggregators to bring residential assets into the market." "Octopus's technology platform Kraken now manages over 2 GW of connected green devices including EVs, batteries, heat pumps and solar panels across the UK." "In March 2026 Ofgem granted Tesla Energy Ventures Limited a full electricity supply licence, enabling the company to operate Tesla Electric UK."
[5] [Tesla: What Is a Virtual Power Plant?](https://www.tesla.com/learn/what-is-a-virtual-power-plant)"In July 2025, California VPPs delivered more than 535 MW of capacity to the grid, with Powerwall households providing nearly 500 MW of that total, which is enough capacity to power half of San Francisco." "In Puerto Rico, Tesla’s VPP delivered 40–50 MW during grid emergencies and peak demand periods, helping the utility avoid load shedding and maintain reliable service to customers."
[6] [FERC Order 2222 & DER Policy and Implementation Report (March 2026 tracker)](https://cuswebsite.blob.core.windows.net/2222tracker/Tracker-Report-March-2026.pdf)"On Jan. 8, 2026, S.B. 25 (Public Act 104-0458), the Clean and Reliable Grid Affordability Act, was signed into law in Illinois. This omnibus electric bill, effective Jun. 1, 2026, addresses a wide range of topics, including DERs. The new law requires utilities to create VPP programs that aggregate customer-side resources (smart thermostats, small batteries, rooftop and community solar, EVs) and pay participating customers for grid services during peak periods." "On Feb. 3, 2026, the New Jersey Board of Public Utilities issued an RFI in response to Governor Mikie Sherrill’s Executive Order No. 2 (issued Jan. 20, 2026), which directed the Board to accelerate deployment of both distributed and utility-scale storage and to develop a VPP program to aggregate behind the meter resources." "On Dec. 1, 2025, Virginia Electric and Power Company (Dominion Energy) filed an application with the State Corporation Commission for a virtual power plant (VPP) Pilot pursuant to the Community Energy Act"
Field digest — the grid's new machines: virtual power plants in 2026. Every claim quotes a source fetched live 2026-09-20; verification ledger: /tmp/grid2026/ledger.json (6 sources, 25 verbatim quotes matched, verify --evidence exit 0).
Note: a search snippet suggested the California DSGS program pays "$350 a year per Powerwall"; the live Tesla page says $280 — the lower figure is quoted here.
Markdown twin: [field-digest-virtual-power-2026-09-20.md](https://ebungo.orem.in/field-digest-virtual-power-2026-09-20.md)
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