Toronto skyline and CN Tower at dusk, the Greater Toronto Area served by Terawatt Solar Photo: Berkay Gumustekin / Unsplash
Solar Company Ontario

Looking For A Solar Installer In The GTA Who Gives You Real Numbers, Not A Generic Quote?

In-house design and installation crews serving Toronto, Markham, Mississauga, Brampton, Vaughan, Oakville, Burlington, Hamilton and Kitchener.

Terawatt Solar has installed residential and commercial systems across the Greater Toronto Area since 2021, headquartered in Markham. Every proposal is built from your actual utility billing and roof data, not a satellite estimate, and the crew that designs your system is the same crew that shows up on install day.

(877) 648-3323 Get Your Real Numbers
In-House Crews, No Subcontractors
Installing Across The GTA Since 2021
Markham Head Office
We Handle Permits & Interconnection
Completed residential rooftop solar installation on a suburban Toronto area home
A recent Terawatt Solar residential rooftop install, Greater Toronto AreaReal client project, not a stock rendering
Licensed & Insured Tier 1 Panels, Manufacturer Warranty Free On-Site Assessment In-House Permitting & Interconnection Serving The Full GTA
What It Actually Costs

Average System Cost & Break-Even For GTA Homes

Figures below reflect a typical 9 kW residential system sized for an average Greater Toronto Area home on time-of-use billing. Your exact numbers depend on your roof, usage, municipality, and whether you take the provincial solar rebate or keep net metering, a free assessment gets you real figures.

9 kW
Average System Size
Our typical GTA residential install size
~$25,200
Typical Installed Cost
About $2.80 per watt CAD, before any rebate
Year 11
Average Break-Even
Net-metered scenario, point savings overtake cost
CUMULATIVE NET POSITION ($) YEARS SINCE INSTALLATION -$68k -$42k -$15k +$11k +$38k Yr 0Yr 5Yr 10Yr 15Yr 20Yr 25 BREAK-EVEN -$68k if you never go solar +$38k net position with solar
Cost of staying on grid power only
Net position with Terawatt solar
Break-even point

Illustrative estimate for a 9 kW net-metered residential system, based on Ontario time-of-use rates (roughly 20.3¢/kWh on-peak, 9.8¢/kWh off-peak) and an assumed average annual rate increase. Actual costs, production, and savings depend on your roof, shading, usage, financing, and whether you choose net metering or the provincial rebate route. Ask us for a figure specific to your home.

Aerial view of Greater Toronto Area suburban rooftops
Our Services

Solar & Battery Solutions For GTA Homes & Businesses

Whether you're a Markham homeowner trying to beat rising time-of-use rates or a Mississauga business evaluating a commercial rooftop array, our design team builds around your actual energy use, not a generic template.

Residential Solar

Custom-sized rooftop systems built for your specific GTA home, your roof orientation, and your real hydro usage, not a satellite guess.

Residential Solar Installation GTA →

Commercial Solar

Rooftop, carport, and ground mount systems engineered for warehouses, retail plazas, and industrial sites across Toronto and the surrounding region.

Commercial Solar Ontario →

Battery Storage

Pair solar with battery storage for outage backup or to shift self-generated power into expensive on-peak evening hours instead of selling it back cheap.

Battery Storage Installation →
Your Savings At A Glance

Monthly, Annual & Lifetime Savings

Based on an average 9 kW net-metered residential system offsetting roughly 85 to 90% of a typical GTA home's electricity use on Ontario time-of-use pricing.

Rooftop solar panel array installed on a GTA area home
~$1,380
Avg. Annual Savings
Savings PeriodEstimated AmountNotes
Monthly~$115Reduction in your average time-of-use hydro bill
Annual~$1,380Compounds as Ontario on-peak rates continue to rise
25-Year Lifetime~$38,000Net savings after system cost, net-metered scenario
Incentives & Programs We Check For Every GTA Client

Program terms change. We confirm current eligibility and run both scenarios below before you sign anything.

ProgramValueStatusNotes
Net Metering (Toronto Hydro & most GTA utilities)1:1 retail creditActiveAvailable to customers who don't take the HRSP solar rebate
Home Renovation Savings Program (HRSP)Up to $10,000ActiveUp to $5,000 solar + $5,000 battery, stackable, but disqualifies net metering
Municipal PACE Financing (select municipalities)Low fixed rateActiveAvailable in some GTA municipalities, repaid via property tax
Time-of-Use Rate Arbitrage~20.3¢ vs ~9.8¢/kWhActiveOn-peak to off-peak spread that makes solar plus battery more valuable
Federal Clean Technology ITC30% of system costActiveCommercial and business projects only, not residential
Solar panel installation crew working on a GTA rooftop
2
Scenarios Modeled Per Quote

Figures are non-binding estimates for an average 9 kW residential system based on current Ontario time-of-use pricing and active programs as of this writing. Your actual system size, cost, and savings depend on your roof, energy use, municipality, and which incentive path you choose. Request a free assessment for numbers specific to your home.

Markham, Ontario suburban street where Terawatt Solar is headquartered

Get The Numbers For Your Home

Send a recent hydro bill and we'll tell you your real offset percentage, system cost, and 25-year savings under both the net metering and rebate scenarios, not a generic estimate.

Get a Free Quote
Real Projects

See How Much Our Customers Save With Solar

Our focus is getting homeowners and businesses a fast return on investment against rising Ontario electricity rates. In-house crews, decades of combined installation experience, and a Markham office you can actually visit.

All Our Projects →
Residential rooftop solar installation, Toronto area home

Residential Install, Toronto Area

9.2 kW system87% offset

Full rooftop array sized to a family's actual time-of-use billing history, not a rough estimate.
Rooftop solar panel installation crew at work on a GTA home

In-House Crew On Site

Our own installersNo subcontractors

The same team that designs your proposal is the team that installs it, start to finish.
Completed solar panel array on a residential rooftop in the GTA

Completed Residential Array

Net metered25-yr warranty

Finished install backed by manufacturer product warranties and our own workmanship guarantee.
Terawatt Solar branded service van and crew on site for a residential install
Why Local Matters

We're Not A Call Centre Dispatching A Subcontracted Crew

A lot of solar companies advertising in the GTA are sales offices in another province or country, handing your job off to whichever subcontracted crew is free that week. Terawatt Solar is headquartered at 7030 Woodbine Ave in Markham. When you call, you reach the people who will actually be on your roof.

That matters for more than convenience. Our racking, flashing, and weatherproofing choices account for Ontario's freeze-thaw cycles and heavy snow load, details a company designing for a warmer climate doesn't think about until a roof leak shows up two winters later.

Terawatt Solar technicians installing rooftop solar panels on a GTA home
How We Actually Work

Real Numbers Before You Sign Anything

Every quote we send is built from your actual hydro billing history, not a satellite guess at your roof. We model both the net metering path and the Home Renovation Savings Program rebate path side by side, because for a lot of households one clearly beats the other and a generic quote never tells you which.

We handle your building permit, electrical inspection, and utility interconnection directly with your local hydro provider. No handoff to a second subcontractor, no separate company showing up months later to finish what another one started.

Finished rooftop solar panel installation overlooking a GTA neighborhood
Why Solar In The GTA Now

Ontario's Time-of-Use Rates Make Solar A Straightforward Decision

The Greater Toronto Area isn't short on sunlight, and it's definitely not short on rising electricity costs. On-peak time-of-use pricing has pushed well past 20 cents per kWh in recent years, with further increases expected, which is the real driver behind the solar adoption we're seeing across Markham, Mississauga, Brampton, and Toronto itself.

  • Ontario on-peak rates keep climbing. Your solar system's output cost locks in today.
  • We model net metering and the HRSP rebate side by side so you pick the better math, not the better sales pitch.
  • Our racking and electrical work are built for Ontario winters, not adapted from a warmer-climate design.
  • Toronto to Kitchener, we install across the full GTA and into southwestern Ontario.
  • We handle all permits, utility interconnection, and inspection paperwork in house.
What Clients Say

Homeowners And Businesses Across The GTA

We ask every client to leave an honest review once their system is live and producing, good or bad. Visit our Google Business Profile to read the full, unfiltered set.

Oakville, Ontario lakefront, part of the Greater Toronto Area service territory
Service Area

Solar Installation Across The Greater Toronto Area

From our Markham head office we install residential and commercial systems throughout the GTA and into southwestern Ontario.

Toronto Markham Mississauga Brampton Vaughan Oakville Burlington Hamilton Kitchener
Frequently Asked Questions

Solar Panel Installation Questions, Answered

How much does solar cost in Ontario?
Installed residential solar in the GTA generally runs from about $2.60 to $3.30 per watt before incentives, so a typical 9 kW home system lands in the $23,000 to $30,000 range. See our residential solar page for a size-by-size breakdown, or request a free assessment for numbers specific to your roof.
Is solar worth it in Toronto and the GTA?
For most homeowners on time-of-use billing, yes. Ontario's on-peak rate runs well above 20 cents per kWh while off-peak sits closer to 10 cents, and that spread has widened in most recent years. A properly sized system offsets a large share of your consumption at today's install price for 25 plus years.
What is the Home Renovation Savings Program and does it cover solar?
The HRSP offers up to $10,000 in stackable rebates for eligible homeowners, up to $5,000 toward solar and up to $5,000 toward battery storage installed alongside new solar. The catch: accepting the solar rebate currently disqualifies that system from net metering for its lifetime, so we model both scenarios before you choose. See our incentives and rebates guide for current program details.
What is net metering and can I still get it in the GTA?
Net metering credits you for solar power sent back to the grid, applied against what you draw at other times. Toronto Hydro and most other GTA utilities still offer it to customers who skip the HRSP solar rebate. For many higher-usage homes, net metering alone produces a faster payback than the rebate route.
How long does it take to pay off a solar system in the GTA?
On recent Terawatt Solar client designs, cash payback on a net-metered residential system typically falls in the 9 to 13 year range depending on roof orientation, shading, and household usage. See our case studies for real project numbers, not marketing averages.
Does battery storage make sense for a GTA home?
Battery storage is most valuable for homes wanting backup power during an outage, or wanting to shift self-generated solar into expensive evening on-peak hours. See our battery storage page for how we size a battery to your actual usage pattern.
What areas does Terawatt Solar serve?
We install across the Greater Toronto Area including Toronto, Markham, Mississauga, Brampton, Vaughan, Oakville, Burlington, Hamilton, and Kitchener, with our main office in Markham.
Do you handle permits and utility interconnection?
Yes. Our in-house team manages the building permit, electrical inspection, and utility interconnection paperwork directly, so you aren't coordinating between a sales office and a separate installation subcontractor. See our commercial solar page for how this works on larger projects.

Ready To See Your Real Savings?

Get a free, no-obligation assessment from Terawatt Solar's in-house design team. We'll review your roof, your hydro bill, and both the net metering and rebate paths available to you.

Get a Free Quote
Or call us directly at (877) 648-3323