Commercial Solar Incentives Ontario 2026 Update

Ontario’s commercial solar incentive landscape shifted back in June. If you’re exploring commercial solar to cut operational expenses (OpEx) for your business—or if you’ve been waiting to see how incentive updates affect your ROI—this guide provides the executive-level clarity you need.

At Otter Energy, we believe in making solar simple and predictable. Volatile energy is a business risk, and solar is the shield. Here is the complete, current picture of what changed, what’s still available, and what a fully stacked, turnkey incentive package actually looks like for an Ontario manufacturer in 2026.

What Changed in Ontario’s Save on Energy Solar Incentive?

Effective June 30, 2026, Ontario’s Save on Energy Retrofit Program updated the incentive rate for eligible commercial solar PV projects.

The Save on Energy solar incentive applies exclusively to behind-the-meter, rooftop-mounted systems—ground-mount solar does not qualify. This incentive caps out at 50% of eligible project costs.

Relying on the grid means unpredictable rates and exposure to carbon taxes. Ontario wholesale electricity prices are rising through 2026 and 2027, and provincial demand is expected to grow 75% by 2050 due to industrial electrification and EV charging. Installing an Otter Energy commercial solar system today allows you to effectively “pre-purchase” your electricity, locking in on-site generation at a fixed, predictable cost for the next 25–30+ years against a rising utility baseline.

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What Other Solar Incentives Are Available in Ontario in 2026?

Federal Clean Technology Investment Tax Credit (CT ITC)

Eligible businesses can claim a 30% refundable tax credit on qualifying commercial solar PV system costs. Because it is a refundable credit, it delivers cash even if your business’s tax liability is zero. The CT ITC applies to qualifying new installations.

Accelerated Capital Cost Allowance (ACCA)

Eligible businesses can write off the full cost of qualifying clean energy equipment in year one. Combined with the 30% CT ITC, businesses can achieve massive effective first-year cost reductions.

Fully stacked Ontario incentive example — 500 kW system

• Save on Energy Retrofit ($770/kW-AC): − $385,000
• Federal Clean Technology ITC (30% of remaining $365,000): − $109,500
• Net cost before ACCA: ~$255,500

The first-year ACCA write-off on that $255,500 provides an additional tax shield. Combined, the effective cost reduction hits 50–55%+.

Can I Stack Ontario and Federal Solar Incentives?

Yes. Businesses can layer both the Save on Energy Retrofit incentive and the federal Clean Technology ITC on the same turnkey project. The federal ITC applies to the net eligible costs calculated after other grants are deducted (meaning after Save on Energy is factored in). When paired with ACCA, this stacking strategy is what allows businesses to achieve 50–55%+ effective cost reductions in year one.

What Is Net Metering and Does It Apply to Commercial Solar in Ontario?

Net metering allows facilities to receive bill credits for excess solar electricity exported back to the grid.

Important: Net metering and the Save on Energy Retrofit solar incentive are mutually exclusive—a project cannot participate in both simultaneously. The Save on Energy incentive is exclusively for behind-the-meter load displacement systems (where the solar is consumed directly on-site). By contrast, net metering is meant for systems that export surplus generation. Our in-house engineers will design the optimal system and determine which financial model yields the highest ROI for your specific facility.