The most common Ontario solar energy cost mistake is comparing the panel invoice to the monthly hydro bill rather than calculating the Levelized Cost of Energy over 25 years, and a property owner on Steeles Avenue in Halton Hills understood this when she received a $58,000 Hydro One connection quote in fall 2023 and spent one afternoon calculating that her Tier 2 solar energy cost over 25 years would be approximately $0.18 per kWh on a fixed basis while the Ontario grid including delivery charges costs $0.21 to $0.30 per kWh today and escalates 3 to 5 percent per year.
The LCOE calculation is straightforward. A Tier 2 system at $2,200 total installed cost produces approximately 496 kWh per year from a 400W array at the Wellington County annual average of 4.0 PSH. Over 25 years, that system produces approximately 12,400 kWh, and the solar energy cost equals $2,200 divided by 12,400 kWh, fixed at $0.18 per kWh for the life of the system.
She had expected the solar energy cost to be higher than the grid rate. The Ontario TOU on-peak rate is $0.203 per kWh and off-peak is $0.113 per kWh. However, Hydro One delivery charges add approximately $0.10 per kWh on top of the energy rate, making the true total grid cost approximately $0.21 to $0.30 per kWh including delivery. At $0.18 per kWh fixed for 25 years, the Tier 2 solar LCOE is below the total Ontario grid cost at every rate tier and at every point in the 25-year comparison period.
I reviewed the solar energy cost comparison with her that afternoon. The 25-year grid cost including the $58,000 Hydro One connection fee, delivery charges, and energy totals approximately $83,106. The 25-year solar cost totals $2,200. The Victron SmartShunt confirmed the Tier 2 system delivering 496 kWh in year one at the confirmed $0.18 per kWh solar energy cost calculation. See our Ontario solar sizing guide before calculating any solar energy cost comparison.
The Ontario solar energy cost formula: LCOE, annual average PSH, and the 25-year calculation
| Tier | Array size | System cost | Annual kWh | 25yr kWh | Solar energy cost |
|---|---|---|---|---|---|
| Tier 1 (shed) | 100W | $870 | 124 kWh | 3,100 kWh | $0.28/kWh |
| Tier 2 (cabin) | 400W | $2,200 | 496 kWh | 12,400 kWh | $0.18/kWh |
| Tier 3 (residence) | 2,400W | $8,000 | 2,978 kWh | 74,460 kWh | $0.11/kWh |
| Ontario grid off-peak + delivery | n/a | +$58,000 connection | n/a | n/a | $0.21/kWh today, escalating |
The Levelized Cost of Energy formula uses the annual average Peak Sun Hours for Wellington and Halton County Ontario: 4.0 kWh per square metre per day, sourced from Natural Resources Canada PVGIS data for southern Ontario. The formula is: array watts x 4.0 PSH x 365 days x 0.85 system efficiency = annual kWh. Divide total system cost by 25-year production for the LCOE. Tier 1 (100W) produces 124 kWh per year. Tier 2 (400W) produces 496 kWh per year. Tier 3 (2,400W) produces 2,978 kWh per year. These are annual average figures, not worst-case January figures.
The January PSH of 1.5 is the correct figure for battery sizing and gray-streak backup planning, not for solar energy cost calculations. Using January PSH for the LCOE would overstate the system cost per kWh by approximately 2.7 times, producing an incorrect figure. The correct solar LCOE results at 4.0 annual average PSH: Tier 1 at $0.28 per kWh, Tier 2 at $0.18 per kWh, Tier 3 (2,400W, $8,000) at $0.11 per kWh. All three figures are fixed at the installation date for the full 25-year system life with no escalation. See our solar panel cost guide for the full component cost breakdown by tier.
Solar energy cost vs Ontario grid: $0.18 per kWh fixed versus $0.21 to $0.30 and escalating
The solar energy cost versus Ontario grid comparison in 2026. Ontario TOU on-peak rate: $0.203 per kWh. Off-peak: $0.113 per kWh. Hydro One delivery charges add approximately $0.10 per kWh based on the $75 per month average delivery charge divided by 750 kWh average monthly consumption. Total grid cost including delivery: approximately $0.21 per kWh off-peak to $0.30 per kWh on-peak. Tier 2 solar LCOE at $0.18 per kWh falls below the total Ontario grid cost at every rate tier. Tier 3 system cost per kWh at $0.11 falls below even the off-peak energy rate before delivery is added.
The solar energy cost comparison improves every year because the solar cost is fixed while the grid cost escalates. Ontario electricity rates have increased approximately 3 to 5 percent per year over the past decade. At 3 percent annual escalation from today’s $0.21 per kWh off-peak total, the grid reaches approximately $0.28 per kWh by year 10, $0.37 by year 20, and $0.44 by year 25.
The Tier 2 solar energy cost remains at $0.18 per kWh in year 25. The Victron MPPT 100/30 produces the same kWh in year 25 as in year 1 from the same array. By year 25, the fixed solar LCOE is 59% below the escalated grid rate. See our solar power cost guide for the full 25-year cost comparison.
Pro Tip: To calculate your personal solar energy cost per kWh, use the annual average PSH of 4.0 for Wellington and Halton County, not the January figure of 1.5. The formula is simple: multiply your array wattage by 4.0, then by 365 days, then by 0.85 system efficiency to get annual kWh. Divide your total installed system cost by 25 times your annual kWh to get the 25-year LCOE. For a $2,200 Tier 2 system: 400W x 4.0 x 365 x 0.85 = 496 kWh per year. $2,200 / (496 x 25) = $2,200 / 12,400 = $0.177 per kWh. Compare that to your current Hydro One bill: add the delivery charge line to the energy charge and divide by the kWh consumed. Most Wellington and Halton County property owners will find their current grid cost is $0.22 to $0.30 per kWh including delivery.
The rural Ontario break-even: why the solar energy comparison is decided by the connection quote
The rural Ontario break-even on solar energy cost is immediate when the Hydro One connection quote exceeds the total solar system cost. For the Halton Hills property: $58,000 Hydro One connection versus $2,200 Tier 2 solar cost total. The solar LCOE is decided before the first watt is produced. The 25-year grid cost total: $58,000 connection plus $22,500 delivery ($75 per month for 300 months) plus $2,606 energy at $0.21 per kWh average on 12,400 kWh consumed = $83,106 total. The 25-year solar energy cost: $2,200 total.
A property owner on Wellington Street in Rockwood, Wellington County installed a Tier 1 solar energy cost system in fall 2021 for $870 total. In year one, the system cost per kWh was $870 divided by 124 kWh = $7.02 per kWh, which feels high because the entire investment is paid in year one. By year 4, the cumulative production reached approximately 496 kWh, dropping the effective solar LCOE to approximately $1.75 per kWh.
By year 25, the final solar energy cost will be $870 divided by 3,100 kWh = $0.28 per kWh. The SmartShunt confirmed 124 kWh in year 4, identical to year 1 production, with zero degradation observed. “The cost per kilowatt-hour drops every year the system keeps running. By year 25, I will have paid $0.28 per kWh for power that the grid will be charging $0.39 per kWh for.” See our off grid costs guide for the complete rural connection comparison.
The escalation hedge: why a fixed cost beats a rising grid rate over 25 years
A property owner who installs a Tier 2 system in 2026 at $0.18 per kWh solar energy cost locks that number in for 25 years. Ontario grid rates in 2026 are approximately $0.21 per kWh off-peak including delivery. At 3 percent annual escalation, the off-peak total reaches $0.28 per kWh by 2036 (year 10), $0.37 by 2046 (year 20), and $0.44 by 2051 (year 25). The solar LCOE stays at $0.18 per kWh throughout all 25 years. By year 25, the solar cost is 59% below the escalated grid rate.
Mono PERC panels degrade at approximately 0.5 percent per year, after 25 years, the Renogy 100W Starter Kit panel produces approximately 87.8% of its original output, raising the effective 25-year solar energy cost from $0.18 to approximately $0.21 per kWh for Tier 2. The Battle Born LFP battery bank requires replacement after approximately 3,000 to 4,000 cycles (approximately 8 to 11 years), adding one replacement cost to the 25-year solar LCOE. Even with panel degradation and one battery replacement factored in, the total 25-year solar cost remains below the escalated Ontario grid rate at every point from year 1 forward. See our solar panel kit guide for the Tier 1 component specification.
NEC and CEC: Ontario permit requirements for permanent solar energy systems
NEC 690 governs permanent solar energy installations in Ontario. Any permanently mounted system requires battery cable sizing at 125% of maximum continuous current, Class T fusing at the battery positive terminal, and ESA-compliant wiring throughout. The ESA permit at $300 to $400 is included in the Tier 1, Tier 2, and Tier 3 solar energy cost figures cited in this guide. Contact the NFPA at nfpa.org for current NEC 690 requirements for residential solar energy installations.
CEC Section 64 governs electrical installations in Ontario. Any permanently installed solar energy cost system, including panel mounting, charge controller, battery bank wiring, and inverter connections, requires an ESA permit before installation begins. The ESA permit is a mandatory component of the total solar cost for any permanent installation. A system installed without an ESA permit is uninsured and illegal under Ontario electrical code. Contact the Electrical Safety Authority Ontario at esasafe.com before beginning any permanent solar energy installation in Ontario.
The solar energy cost Ontario verdict: Tier 1 at $0.28, Tier 2 at $0.18, Tier 3 at $0.11 per kWh
- Ontario rural property owner deciding between grid connection and solar: the solar energy cost comparison for any property with a Hydro One quote above $5,000 is immediate. Tier 2 solar LCOE is $0.18 per kWh fixed for 25 years. Ontario grid total cost is $0.21 to $0.30 per kWh today and escalating. The Halton Hills result: $2,200 total solar cost versus $83,106 total 25-year grid cost. The SmartShunt confirmed 496 kWh in year one at the $0.18 per kWh solar energy cost. The break-even is day one, the solar system costs less than the connection fee alone.
- Ontario urban homeowner on a grid-connected property calculating the solar energy cost ROI: the solar cost advantage grows over time, crossing below grid off-peak rates at approximately year 10. Tier 2 solar LCOE at $0.18 per kWh is below the Ontario grid on-peak total ($0.30 per kWh) from day one but above the off-peak total ($0.21 per kWh). The solar energy cost advantage becomes absolute at year 10, when the grid off-peak total escalates above $0.28 per kWh. From year 10 onward, the system cost per kWh is below every Ontario grid tier. The Victron MPPT 100/30 and SmartShunt track cumulative yield for the ongoing solar energy cost comparison.
- Ontario property owner comparing solar energy cost tiers: specify the tier that matches the load, not the tier with the lowest per-kWh cost. Tier 1 (100W, $870) at $0.28 per kWh is the highest solar LCOE per kWh but the lowest total investment, correct for sheds and outbuildings. Tier 2 (400W, $2,200) at $0.18 per kWh is below current total grid rates, correct for off-grid cabins and rural properties. Tier 3 (2,400W, $8,000) at $0.11 per kWh is below even off-peak grid energy before delivery is added, the strongest per-kWh solar cost case. A Tier 3 system sized for a shed load is over-specified; a Tier 1 system sized for a full residence is under-specified. Match the system to the load first, then calculate the resulting solar energy cost per kWh.
Frequently Asked Questions
Q: How much does solar energy cost per kWh in Ontario?
A: The solar energy cost per kWh depends on the system tier and is calculated using the Levelized Cost of Energy formula over 25 years at the Wellington/Halton County annual average PSH of 4.0. Tier 1 (100W, $870 total): $0.28 per kWh. Tier 2 (400W, $2,200 total): $0.18 per kWh. Tier 3 (2,400W, $8,000 total): $0.11 per kWh. These solar LCOE figures are fixed at installation and do not escalate. Ontario grid including delivery currently costs $0.21 to $0.30 per kWh and escalates approximately 3 to 5 percent per year. Tier 2 solar cost is already below the grid off-peak total including delivery on installation day, and the gap widens every year.
Q: Is solar energy cheaper than Hydro One in Ontario?
A: Yes for most rural Ontario properties. The Tier 2 solar energy cost of $0.18 per kWh is below the Ontario grid total cost of $0.21 to $0.30 per kWh including delivery from day one. For rural properties with Hydro One connection quotes above $5,000, the solar LCOE comparison is decisive before a single kilowatt-hour is produced, the Halton Hills result was $2,200 total solar cost versus $83,106 total 25-year grid cost including the $58,000 connection fee. For urban grid-connected properties, the solar energy cost advantage becomes absolute at approximately year 10 when grid escalation pushes the off-peak total above the fixed solar LCOE. The SmartShunt tracks cumulative production for the ongoing per-kWh system cost verification.
Q: What is the break-even point for solar energy cost in rural Ontario?
A: For any rural Ontario property where the Hydro One connection quote exceeds the total solar system cost, the solar energy cost break-even is day one. A Tier 2 system at $2,200 total solar cost breaks even against a $58,000 Hydro One connection before installation is complete. For urban grid-connected properties where the connection already exists, the solar LCOE break-even against grid off-peak rates plus delivery occurs at approximately year 10 at 3 percent annual grid escalation, and at approximately year 7 at 5 percent annual escalation. The solar energy cost is fixed on installation day. Every year of grid rate escalation moves the break-even earlier and widens the 25-year savings gap.
This build is engineered within the 48V DC Safety Ceiling. Diagnostic logic is based on 20+ years of technical service experience. All structural and electrical installations must be verified by a Licensed Professional and comply with your Local AHJ. See our legal and safety disclosure for full scope.
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