Hydro One (TSX: H, OTC: HRNNF) plans $430M Durham Kawartha line
Filing Impact
Filing Sentiment
Form Type
6-K
Rhea-AI Filing Summary
Hydro One Limited filed a Form 6-K highlighting that its subsidiary Hydro One Networks Inc. has applied to the Ontario Energy Board for approval to build the Durham Kawartha Power Line. This is an approximately 55-kilometre, double-circuit, 230-kilovolt transmission line between Clarington TS and Dobbin TS.
The project represents an approximately $430 million investment aimed at supporting growth and grid reliability for communities across Peterborough, Quinte West and into the Ottawa region, with the line expected to be in service in 2029. Proximate First Nations will have the opportunity to invest in a 50% equity stake in the transmission line component under Hydro One’s First Nation Equity Partnership Model.
Hydro One notes it is Ontario’s largest electricity transmission and distribution provider with 1.5 million customers, $39.7 billion in assets and $9 billion in 2025 annual revenues, after investing $3.4 billion in its networks and purchasing $3.0 billion of goods and services in 2025.
Positive
- None.
Negative
- None.
Key Figures
Project investment: $430 million
Line length: 55 kilometres
Voltage level: 230 kilovolt
+5 more
8 metrics
Project investment
$430 million
Durham Kawartha Power Line construction cost
Line length
55 kilometres
Durham Kawartha double-circuit transmission line
Voltage level
230 kilovolt
Durham Kawartha Power Line design
Planned in-service year
2029
Expected in-service date for Durham Kawartha line
First Nations equity opportunity
50% stake
Equity in transmission line component for proximate First Nations
Total assets
$39.7 billion
Assets as at December 31, 2025
Annual revenues
$9 billion
2025 annual revenues
Network investment 2025
$3.4 billion
2025 investment in transmission and distribution networks
Key Terms
leave-to-construct application, Ontario Energy Board, First Nation Equity Partnership Model, transmission line, +1 more
5 terms
leave-to-construct application regulatory
"announced it has filed a leave-to-construct application with the Ontario Energy Board"
Ontario Energy Board regulatory
"filed a leave-to-construct application with the Ontario Energy Board (OEB)"
First Nation Equity Partnership Model financial
"Through Hydro One’s First Nation Equity Partnership Model, proximate First Nations will have the opportunity"
transmission line technical
"230-kilovolt transmission line will be built between Clarington Transformer Station"
A transmission line is the infrastructure—wires, towers, ducts or cables—that carries electricity or data over long distances from producers to users or networks. Investors care because these lines determine how reliably and cheaply power or communications can be delivered; like a highway for goods, congested or aging lines can cause delays, extra costs, outages or regulatory expenses that affect revenue, maintenance needs and future growth prospects.
forward-looking information regulatory
"This press release may contain “forward-looking information” within the meaning of applicable Canadian securities laws"
Forward-looking information are predictions, plans, estimates or expectations about a company’s future performance, results or events, such as sales forecasts, project timelines, or anticipated costs. It matters to investors because these statements guide expectations but rely on assumptions and uncertain factors—like a weather forecast for a business—so investors should treat them as informed guesses rather than guarantees and consider the risks and possible changes behind the numbers.
FAQ
What project did Hydro One (HRNNF) highlight in its June 2026 Form 6-K?
Hydro One highlighted its application to build the Durham Kawartha Power Line, a 55-kilometre, 230-kilovolt transmission line. The project aims to support growth and reliability in central and eastern Ontario, linking Clarington TS and Dobbin TS, with expected in-service date in 2029.
How much will Hydro One (HRNNF) invest in the Durham Kawartha Power Line?
The Durham Kawartha Power Line represents an approximately $430 million investment. This spending targets increased transfer capability on the transmission system, job creation during construction, and more reliable power for communities across Peterborough, Quinte West and into the Ottawa region.
How are First Nations involved in Hydro One’s (HRNNF) Durham Kawartha project?
Proximate First Nations will have the opportunity to invest in a 50% equity stake in the transmission line component. This is through Hydro One’s First Nation Equity Partnership Model, under which Hydro One and First Nations collaborate on planning, development and construction of the project.
When is Hydro One’s (HRNNF) Durham Kawartha Power Line expected to be in service?
The Durham Kawartha Power Line is expected to be in service in 2029. Once operational, the roughly 55-kilometre, 230-kilovolt line is intended to increase transfer capability, support regional growth and enhance reliability for communities in central and eastern Ontario.
What scale of operations does Hydro One (HRNNF) report for 2025?
Hydro One reports serving 1.5 million customers with $39.7 billion in assets as of December 31, 2025. The company generated $9 billion in 2025 annual revenues, invested $3.4 billion in its transmission and distribution networks, and purchased $3.0 billion of goods and services.
What regulatory step has Hydro One (HRNNF) taken for the Durham Kawartha line?
Hydro One Networks Inc. has filed a leave-to-construct application with the Ontario Energy Board under Section 92 of the Ontario Energy Board Act, 1998. This application seeks approval to construct the Durham Kawartha Power Line and includes details on route, design, timing and cost.