A virtual power plant (VPP) is a network of household devices, such as smart thermostats, home batteries, water heaters and EV chargers, that a utility or aggregator coordinates through software so they act together like a single power plant. When demand peaks, the VPP trims or shifts thousands of homes' electricity use a little, or draws on their batteries, avoiding the need to fire up an extra generator. In Canada, VPPs are already working at scale with smart thermostats, and battery-based programs are growing.
Key takeaways
- VPPs pool many small devices to reduce or supply power when the grid needs it most.
- Canada's largest VPP-style programs so far use smart thermostats; battery and EV programs are mostly pilots or early offerings.
- Participants typically receive incentives or bill credits, and can usually override events.
- With a battery VPP, you agree to let the program discharge your battery at certain times, which can affect how much backup is left.
- Read the terms: event frequency, reserve levels, data sharing and how to opt out.
How a virtual power plant works
- You enrol a compatible device through your utility, provincial program or an approved company.
- The operator forecasts peaks, typically hot summer afternoons or cold winter mornings and evenings.
- During an event, software sends signals to enrolled devices: thermostats pre-cool or pre-heat then ease off slightly, water heaters pause, EV chargers delay, and batteries discharge to power your home or the grid.
- The grid sees a reduction equivalent to a power plant's output, spread across thousands of homes.
- You're compensated, often through an enrolment incentive, per-event credits or an annual payment.
Because each home contributes only a small amount for a short time, most participants barely notice events.
VPPs in Canada today
Canadian VPP activity has so far centred on demand response from smart thermostats and other controllable loads:
- Ontario: The province's Save on Energy Peak Perks program, run through the grid operator, enrols smart thermostats to reduce summer peak demand and has been described as Canada's largest residential VPP program. Ontario's grid operator reported a maximum verified demand reduction of about 100 MW from the program in 2024.
- Quebec: Hydro-Québec's winter demand-response offerings reportedly involved around 60,000 participants reducing winter peak demand by roughly 200 MW in 2024–25, according to an industry report.
- Other provinces: Utilities across the country have run pilots involving home batteries, water heaters and EV charging. Program availability changes frequently.
Battery-based VPPs, where utilities or aggregators dispatch customers' home batteries, are common in parts of the United States and Australia and are emerging in Canada through pilots and early programs. Check with your utility and our provincial guides for what's available near you.
Which devices can join?
| Device | How it helps | What you notice |
|---|---|---|
| Smart thermostat | Pre-heats or pre-cools, then adjusts setpoint slightly during peaks | Temperature shifts of a degree or two for a few hours |
| Home battery | Discharges during peaks to cover home use or export | Less stored energy right after an event |
| Electric water heater | Pauses heating for a short period | Usually nothing, thanks to tank storage |
| EV charger | Delays or slows charging during peaks | Car charges later in the night |
| Heat pump | Modulates output with pre-conditioning | Small temperature changes |
What you gain
- Payments or bill credits, which can modestly improve the economics of a battery; see Is a home battery worth it? for the broader math.
- A cleaner grid: Peak demand is often met by the most expensive and, in some provinces, highest-emitting generators. Shaving peaks can cut emissions, as explained on our carbon page.
- Lower system costs: Avoiding new peaking plants and grid upgrades helps keep rates in check over time.
- Supporting renewables: Flexible demand helps balance variable wind and solar output.
What you give up
Some control over your battery
A battery VPP may discharge your battery during peak events. Good programs leave a minimum backup reserve, often a fixed percentage, and avoid dispatching when severe weather or outages are forecast. Ask:
- What reserve level is protected for backup?
- How many events per year, and how long do they last?
- Can I opt out of individual events, and is there a penalty?
Comfort, slightly
Thermostat events may make your home a bit warmer in summer or cooler in winter for a few hours. You can usually override.
Data
VPPs require device data and remote access. Read the privacy policy to understand what's collected, how it's stored and whether it's shared or sold. Prefer programs run by or approved by your utility or a provincial agency.
Warranty considerations
Extra cycling from VPP events counts toward your battery's warranty throughput. Many manufacturers explicitly support VPP participation, but confirm that enrolment won't affect your warranty.
Is joining a VPP right for you?
A VPP generally makes sense if:
- You have a compatible thermostat, battery, water heater or charger.
- You can tolerate minor comfort changes or reduced battery reserve on a handful of days.
- The program's terms protect your backup needs and your data.
If backup is your top priority, such as for medical equipment or a rural home prone to long outages, choose a program that guarantees a high reserve or skip battery enrolment and join with a thermostat instead.
Frequently asked questions
Will a virtual power plant drain my battery before a storm?
Well-designed programs avoid dispatching when outages are likely and keep a protected backup reserve, but terms vary. Confirm the reserve level and storm policy before enrolling.
How much can I earn from a VPP?
It depends on the program and device. Thermostat programs typically offer modest enrolment or annual incentives, while battery programs may pay more; amounts change, so check current offers with your utility or our rebate finder.
Do I need solar to join a battery VPP?
Not necessarily. Some programs accept standalone batteries charged from the grid, while others focus on solar-plus-storage systems; eligibility rules vary by program.
The bottom line
Virtual power plants turn ordinary homes into a flexible, distributed resource that helps the grid handle peaks more cleanly and cheaply. Canadian programs are already proving the concept with smart thermostats, and battery-based VPPs are next. If you join, read the fine print on reserve levels, event limits and data, and you can help the grid while keeping your home comfortable and protected.
Sundamentals is an independent, non-profit education platform. Program details and prices change often — check current programs for your address in our rebate finder.