So you have decided to take control of your energy bills and join Ontario's growing prosumer movement. If you live in a rural area, a small town, or outside major urban cores, your solar journey often begins with one organization: Hydro One.

Navigating a utility-scale distributor can feel like working through layers of technical documentation and administrative steps. At Solar X, transparency matters. This guide breaks down the essentials of connecting a solar system to the Hydro One grid in 2026, including program structure, capacity verification, technical limits, and approval workflows.

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Net Metering vs. Load Displacement

Solar projects connected through Hydro One typically follow two operational models.

Net metering

Net metering allows customers to generate renewable electricity primarily for their own use and export excess energy to the grid for bill credits. Credits can be carried forward for up to 12 months to offset future electricity costs. This is the most common configuration for homeowners installing rooftop solar. Learn more about net metering in Ontario.

Load displacement

Load displacement systems are configured to offset on-site consumption without exporting electricity. These installations require documentation proving non-export behavior and are often used in specialized commercial or incentive-driven scenarios.

Practical reality

Modern system design often incorporates both approaches depending on configuration, export permissions, and project objectives. Installers evaluate which pathway maximizes ROI while remaining compliant with connection rules.

Residential Size Limits and Inverter Constraints

Ontario distribution system classifications define micro-generation as systems up to 10 kW, which qualify for streamlined net metering connection processes. Hydro One provides connection pathways specifically for projects within this range. For system sizing guidance, explore our solar panel options.

• Key technical insight: The limit applies to inverter output capacity.
• Engineering reality: Larger systems transition into small generation and require additional studies.
• Design implication: Oversize DC panels while keeping AC inverter output at or below 10 kW.

Checking Grid Capacity: Can You Go Solar?

A suitable roof does not guarantee the grid can accept exported solar generation. Hosting capacity depends on feeder and transformer availability within the distribution network. Hydro One provides a structured verification workflow that should be followed before equipment purchases or final design.

Step 1 - Preliminary screening

Start with the official Generation Capacity Map:https://www.hydroone.com/business-services/generators/generation-capacity-map

• Shows geographic hosting availability.
• Displays feeder-level generation capacity.
• Intended for informational screening only and cannot confirm eligibility.

Hydro One states the map should not be relied upon as final verification. Customers must use further validation tools and consultation before proceeding.

Step 2 - Definitive verification (recommended best practice)

Contact Hydro One's Distributed Connections Group directly at 1-877-447-4412. Provide your account number and request station and feeder information. This contact supports net-metering inquiries, application guidance, and distributed generation questions.

Step 3 - Engineering validation

Once station and feeder data are obtained, confirm capacity using the Station Capacity Calculator. This tool evaluates transformer and feeder constraints for proposed distributed energy resource connections. It provides an estimated pass or fail result but does not reserve capacity. Only an official Offer to Connect secures allocation.

The Approval and Connection Process

1. Preliminary inquiry and capacity verification.
2. Application submission.
3. Technical review.
4. Connection agreement execution.
5. ESA inspection.
6. Metering changes and energization.

Hydro One cautions applicants not to incur equipment costs before receiving connection approval, as technical constraints or transformer limitations may require redesign.

Generator Classification Context

Micro-generation qualifies for simplified net-metering processes, while larger projects require expanded assessments and studies.

Regions Commonly Served Through Hydro One Infrastructure

Hydro One operates the largest transmission network in Ontario and provides distribution service across extensive rural and suburban areas. Regional planning documentation and infrastructure coordination reference municipalities within the following zones.

GTA and Central Ontario Regions

Including Halton, Peel, and York-related infrastructure areas, municipalities referenced across planning zones include:

• Milton
• Burlington
• Oakville
• Vaughan
• Markham
• Richmond Hill
• Aurora
• Newmarket
• King
• East Gwillimbury
• Whitchurch-Stouffville
• Georgina

These locations fall within Greater Toronto regional planning coverage where Hydro One coordinates transmission and distribution infrastructure.

Greater Ottawa Region

Communities within the Ottawa planning corridor include:

• Kanata
• Nepean
• Orleans
• Renfrew-area communities

Hydro One planning spans the Ottawa Valley transmission corridor and surrounding townships.

Toronto Planning Region (Transmission Coordination)

Hydro One owns and operates the majority of Ontario's high-voltage transmission grid supplying local utilities serving the Toronto metropolitan area and surrounding municipalities.

Northwestern Ontario

District-level coverage referenced in planning documentation includes:

• Kenora District
• Rainy River District
• Thunder Bay District

These regions contain numerous communities connected through Hydro One distribution and remote energy systems.

Southwestern, Georgian Bay, and Central Regional Zones

Municipalities referenced across regional planning documentation include:

• Greater Bruce / Huron Area
• Arran-Elderslie
• Brockton
• Kincardine
• Northern Bruce Peninsula
• South Bruce
• Huron-Kinloss
• London Planning Area
• Woodstock
• Ingersoll
• Tillsonburg
• London
• Aylmer
• Chatham-Kent / Lambton / Sarnia
• Chatham-Kent
• Lambton Shores
• Petrolia
• Plympton-Wyoming
• Brooke-Alvinston
• Dawn-Euphemia
• Enniskillen
• St. Clair
• Warwick
• Oil Springs
• Point Edward

These regions overlap with South Georgian Bay, Muskoka, Niagara, and surrounding infrastructure planning zones.

Peterborough-Kingston and Renfrew Planning Areas

Communities referenced through regional coordination and consolidation activity include:

• Peterborough
• Orillia
• Norfolk
• Haldimand
• Woodstock

Planning coordination also spans the Kingston and Renfrew corridors.

Service Boundary Clarification

Service boundaries vary within municipalities. Urban cores are often served by municipal Local Distribution Companies, while surrounding townships may fall under Hydro One distribution infrastructure.

Customers should confirm their distributor by:

• Checking their electricity bill
• Using the provincial lookup tool (Independent Electricity System Operator): https://www.ieso.ca/en/Learn/Electricity-Facts-and-Tools/Helpful-Tools/Find-Your-LDC