How much does commercial solar maintenance cost in Canada?

Green Building Canada says average maintenance cost would be 0.2 to 1 percent of system cost per year, which is $380 to $2,800 a year on a 100 kW array priced at $190,000 to $280,000. Green Building Canada's guide also cites Alberta Utilities' data showing a fixed operations and maintenance figure of $27.47 per kW a year, about $2,747 on 100 kW. Ask each bidder to price its service per kW per year so you can compare offers.

Does a commercial solar array on a flat roof need cleaning?

Sometimes. GreenEnerCanada, an Ontario service company, says rain makes professional cleaning unnecessary in most cases, but panels tilted at less than 5 degrees may not self-clean, and panels near highways, factories or farm fields can collect dust. Ask the designer what tilt the array will use, and check production data before paying for a wash.

Who maintains commercial solar arrays in the GTA?

In this index, 20 of the 161 companies list commercial solar and 4 list repair and maintenance, with one company, Toronto Solar Power, in both. Several other commercial firms, such as Resco Energy Inc. and Alectra Energy Solutions Inc., describe monitoring and maintenance on their own websites. The site has not checked those claims.

Commercial Solar Maintenance: What a GTA Contract Should Cover

Last updated October 15, 2026By The SolarPanelFinder Rooftop Desk

A commercial solar array is easier to keep producing when three things are settled before it is built: a written operations and maintenance contract, monitoring that alerts a named person when output drops, and a budget for replacing the inverter. Green Building Canada puts average upkeep at 0.2 to 1 percent of system cost a year, and the same guide cites a fixed $27.47 per kW a year from Alberta Utilities' data. The budget is the easy part to write down. The contract also has to say who does the work and who watches the data.

Operations and maintenance, often shortened to O&M, is the industry name for that routine work. This guide covers what a commercial O&M contract should hold. The site's guide to hiring a commercial solar contractor covers choosing the builder, and its guide to what solar maintenance involves in Ontario covers home-scale upkeep.

A technician seen from behind in a hard hat and high-visibility vest, carrying a tablet, walks a gravel aisle between rows of low-tilt solar panels on a large flat commercial roof under an overcast sky — Illustration generated for this article. It is not a photograph of a real job and no company listed on this site appears in it.

Key facts

A commercial array is easier to keep producing when the maintenance contract, the monitoring alerts and the inverter budget are all settled before it is built.
Green Building Canada puts average commercial upkeep at 0.2 to 1 percent of system cost a year, which is $380 to $2,800 on its $190,000 to $280,000 price for a 100 kW array; the same guide cites Alberta Utilities' data showing a fixed $27.47 per kW a year, about $2,747, near the top of that span.
GreenEnerCanada says panels tilted at less than 5 degrees may not self-clean in the rain, which makes cleaning a real question on a low-slope commercial roof.
Only 4 of the 161 companies in this index list repair and maintenance, but several commercial firms describe maintenance on their own websites, so ask every bidder for a written service offer.

What should a year of O&M cost?

Plan on a range, not a single figure, because Green Building Canada's 2026 guide to commercial solar costs gives two ways to estimate it. It says average maintenance cost would be 0.2 to 1 percent of system cost per year. On a 100 kilowatt (kW) array, which the guide prices at $190,000 to $280,000 Canada-wide (its Ontario average runs higher), that is $380 to $2,800 a year.

In the same paragraph, the guide cites "Alberta Utilities' data" showing "a fixed O&M of $27.47/kW/year". On a 100 kW array, the Alberta Utilities figure that Green Building Canada cites comes to about $2,747 a year, above the percentage range on a $190,000 array but inside it on a $280,000 one. The guide does not say what size or type of system that figure describes, so treat it as a second reference point rather than a correction.

The practical step is to ask every bidder to price its service plan per kW per year, and to say what that price includes. A low number that leaves out cleaning, inverter labour or monitoring is not comparable to a higher one that covers them. The site's commercial solar cost guide sets out the build-cost ranges these percentages apply to.

What work does a commercial O&M contract cover?

Green Building Canada says large systems require scheduled operations and maintenance, "including panel cleaning, inverter servicing and performance inspections". It adds that annual commercial O&M contracts carry extra cost depending on system size and location. Each of the three needs a line in the contract.

Cleaning. GreenEnerCanada, an Ontario solar service company, citing the Sierra Club, says rain typically washes away most dirt, "making professional cleaning an unnecessary expense in most cases". It names exceptions that matter on commercial roofs. Panels installed at less than a 5-degree angle may not self-clean effectively, and panels near highways, factories or agricultural fields can collect dust. Heavy bird droppings can also block enough light to cut output. A low-slope roof in an industrial area can meet more than one of those conditions, so ask the designer what tilt the array will use. If cleaning is needed, GreenEnerCanada warns against high-pressure water and abrasive materials, so the contract should say how the panels will be washed.

Inverter servicing. The inverter converts the panels' direct current into power the building can use. GreenEnerCanada calls the inverter the one part of a solar system that needs attention, and its service terms are covered in the next section.

Performance inspections. A scheduled check of the array, its wiring and its mounting can catch loose frames, damaged cables and debris before they show up as lost output. GreenEnerCanada also recommends a quick visual inspection after hail or windstorms. Write into the contract whether storm checks are included or billed separately.

When does the inverter need replacing?

Green Building Canada says inverter replacements are typically needed every 10 to 15 years and may cost 10 to 15 percent of the system cost. On a $190,000 array, Green Building Canada's range works out to $19,000 to $28,500. GreenEnerCanada's service page, which does not separate home and commercial systems, puts most replacements at around 10 percent of the total system price.

That is a known cost, so it belongs in the long-term budget from the first year. Ask each bidder which inverter model it proposes, how long its warranty runs, and whether the warranty covers the labour to swap a failed unit as well as the part. Then ask whether the O&M contract includes that labour, or whether it is billed on top.

What should monitoring do?

Monitoring is how a facilities team learns that output has dropped. Green Building Canada says commercial systems "may need advanced monitoring platforms that integrate with building automation systems". Ask whether the platform can feed the building automation system the facilities team already uses.

Ask each bidder four questions about monitoring:

Which platform is proposed, and who owns the account?
Does it send an alert when output drops, and who receives it?
Can it link to the building's existing controls?
Is the subscription included, and for how long?

A drop in output only helps if someone acts on it. Name the person or company responsible for watching the data, and how quickly they must respond.

What about insurance?

Green Building Canada says commercial solar increases a building's asset value and "may require coverage for fire, weather damage, theft and equipment malfunction". It adds that premiums can vary widely and that larger systems may pay more. Talk to the building's insurer before the array goes up, and ask the contractor for the equipment values and drawings the insurer will want. The site does not check any company's insurance, so ask every bidder and service firm for proof of its own cover.

Who offers O&M in the GTA?

In this index, 20 of the 161 companies list commercial solar and 4 list repair and maintenance. One company sits in both: Toronto Solar Power, listed in Leslieville. Its service page invites quotes "for commercial solar panel maintenance contracts" and publishes no prices.

The category count understates the field, because several commercial firms describe maintenance on their own websites without being listed for it here. Each of the following is the company's own claim, read on its home page on 15 October 2026, and the site has not checked any of them:

Resco Energy Inc., in Toronto, lists solar monitoring and maintenance among its services.
Alectra Energy Solutions Inc., in Vaughan, says it handles "ongoing monitoring and maintenance" for the energy projects it builds, which its home page says include solar PV.
Green Integrations Inc., in Toronto, lists operations and maintenance next to commercial solar.
Flow Renewables, in Toronto, lists O&M and asset management among its services.
Enerforge, in Oshawa, says its services include "operations, and maintenance".

So ask every bidder for a written O&M offer alongside the build price, even if it does not advertise one. Agreeing service terms while the contract is still open is easier than finding a service firm after a fault.

Any repair that touches the wiring is electrical work. The Electrical Safety Authority (ESA) says Ontario's electrical code requires almost all electrical work to be reported to it through a notification of work, which the person doing the work should file before the work starts. Confirm that whoever services the array will file it. The site's guide to who does the electrical work on a solar install explains who files that notification and where licence status is checked.

What to write into the contract

The annual O&M scope: cleaning, inverter servicing, inspections, storm checks and reporting.
The annual price per kW, and how it changes over the term.
How quickly the firm responds when monitoring shows a fault.
The inverter model, its warranty term, and who pays the labour to replace it.
Who owns the monitoring account and who receives alerts.
What happens to the service agreement if the contractor closes or is sold.
When the building owner receives the system drawings, the equipment list and the warranty papers.

Frequently asked questions

How much does commercial solar maintenance cost in Canada?: Green Building Canada says average maintenance cost would be 0.2 to 1 percent of system cost per year, which is $380 to $2,800 a year on a 100 kW array priced at $190,000 to $280,000. Green Building Canada's guide also cites Alberta Utilities' data showing a fixed operations and maintenance figure of $27.47 per kW a year, about $2,747 on 100 kW. Ask each bidder to price its service per kW per year so you can compare offers.
Does a commercial solar array on a flat roof need cleaning?: Sometimes. GreenEnerCanada, an Ontario service company, says rain makes professional cleaning unnecessary in most cases, but panels tilted at less than 5 degrees may not self-clean, and panels near highways, factories or farm fields can collect dust. Ask the designer what tilt the array will use, and check production data before paying for a wash.
How often does a commercial solar inverter need replacing?: Green Building Canada says inverter replacements are typically needed every 10 to 15 years and may cost 10 to 15 percent of the system cost. On a $190,000 array Green Building Canada's range works out to $19,000 to $28,500, so put it in the long-term budget and check whether the inverter warranty covers parts and labour.
Who maintains commercial solar arrays in the GTA?: In this index, 20 of the 161 companies list commercial solar and 4 list repair and maintenance, with one company, Toronto Solar Power, in both. Several other commercial firms, such as Resco Energy Inc. and Alectra Energy Solutions Inc., describe monitoring and maintenance on their own websites. The site has not checked those claims.