Quick answer
A battery makes the most sense if you want backup power in outages, use a lot of electricity in the evening, or are on a price plan with expensive peak hours. In Ontario, battery storage bundled with solar can qualify for up to $5,000.1
Three jobs a battery does
- Store solar for the evening. Panels produce during the day; many homes use the most power in the evening.
- Avoid peak prices. On Ultra-Low Overnight pricing, electricity is 3.9¢ per kWh overnight but 39.1¢ on weekdays from 4 to 9 p.m.; a battery can charge cheaply and discharge at peak.2
- Backup power. A battery with backup capability can keep essential circuits running when the grid goes down.
Batteries and net metering
Under net metering, exported solar earns bill credits that expire after 12 months.3 Storing more of your own production can be worth more than exporting it, depending on your usage and price plan.
Rebate
Home Renovation Savings offers up to $5,000 for battery storage bundled with solar, on top of up to $5,000 for the panels.1
Sizing questions to answer first
- Which circuits must stay on in an outage?
- How much do you use between 4 and 9 p.m.?
- Will you add an EV or heat pump later?
Common follow-up questions
Can a battery power my whole house?
It depends on the battery's size and what you run. Many homes back up essential circuits rather than everything.
Can I add a battery later?
Often, yes, but planning for it at install time can make adding one simpler.
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Answers are general information as reported by the sources listed on the date shown, not personal financial or technical advice. Programs, prices and rules change. Canadian Energy Standard is an independent company, not affiliated with any government, utility or program named here.