Electricity Demand and
Grid Integration Risk
ALTO has publicly disclosed almost no information about the electricity its high-speed rail network will consume or how those demands intersect with Ontario’s already-stressed transmission grid — while Hydro One has confirmed on the record it has not received ALTO’s load projections.
What limited information does exist — drawn from an access-to-information request obtained by The Canadian Press and a February 2026 interview with CEO Martin Imbleau — reveals demands that conflict directly with active grid planning in Eastern Ontario.
Critically, Ontario’s backbone transmission grid serving the ALTO corridor is not merely stressed. The Gatineau Corridor — five 230 kV lines built in the 1920s–30s running from the GTA to Ottawa through Peterborough — is already at end-of-life and already under-capacity today, before ALTO’s traction load is added. A $650 million remediation program is underway. It was designed without ALTO’s load — and provides Ottawa-area reliability only to 2037.
What ALTO Has Not Told Us
Estimated total annual electricity consumption · Peak instantaneous demand · Number, location, or capacity of planned traction substations · Confirmation that IESO or Hydro One have been formally notified · Reference to Ontario’s Gatineau Corridor EOL study, the Eastern Ontario Bulk Planning engagement, or the Supply to Belleville sub-study
ALTO’s public disclosure on electricity is a single FAQ entry on altotrain.ca containing no figures, naming no utilities, and committing to no timeline. It uses the notably weak formulation that electricity needs will be “evaluated” — not assessed, disclosed, quantified, or planned for.
What CEO Imbleau Said — February 2026
“I haven’t done the calculations on a yearly basis, but at any one point in time we need 50 megawatts of power to supply a train running at 300 kilometres safely.” On total demand: “It’s a significant block. But we’re already in discussion with Hydro-Québec to make sure the capacity is there, and there’s no issue either in Ontario.”
Martin Imbleau, ALTO CEO — The Canadian Press, February 8, 2026
University of Ottawa professor Ryan Katz-Rosene was quoted in the same article: “Each of those little substations is like powering a small town. So then the question becomes, can the existing grid handle it?” He estimated the full network would drain between one and three per cent of Ontario and Quebec’s current electrical capacity — comparable to a steel plant or large AI data centre cluster.
Hydro One — On Record, February 2026 New
“Once Alto identifies its energy needs for the project, Hydro One, along with the province’s energy planner the Independent Electricity System Operator, will have a clearer understanding of potential impacts to the electricity system and the requirements to energize this project.”
This statement, made in the same news cycle as Imbleau’s assurance of “no issue in Ontario,” confirms that as of February 2026 Hydro One and IESO had not received ALTO’s energy demand projections. There is no public evidence of any subsequent disclosure.
ATI Request: 2023 Power Split
A 2023 study by ALTO’s predecessor (VIA HFR) — obtained through an Access to Information request — showed the following estimated power supply split. These figures were produced under the original HFR design at up to 200 km/h, not the current 300 km/h HSR specification. No updated figures have been made public.
| Supply Source | Estimated Share of ALTO Load |
|---|---|
| Hydro-Québec | Approximately one-third (33%) |
| Hydro One (Ontario) | Approximately two-thirds (67%) |
Ontario therefore carries the majority of ALTO’s traction power load. Imbleau’s assurance of “no issue in Ontario” is unsubstantiated by any formal engineering engagement.
What 50 Megawatts Per Train Actually Means
Imbleau’s figure is consistent with international HSR benchmarks. During peak hours, with multiple trains operating simultaneously across a 1,000 km corridor, simultaneous substation demand could reach several hundred megawatts. The demand profile is not 50 MW once — it is 50 MW per active train across all operating substations simultaneously.
| Parameter | Figure / Derived Estimate |
|---|---|
| Power per train at speed | 50 MW (Imbleau, Feb 2026) |
| Trains per day (planned) | 72 |
| Planned substations (full corridor) | Up to 12 (Imbleau) — technical standard implies 20–33 |
| Ontario share of network load | ~67% (2023 ATI documents) |
| Ontario peak traction load (estimated) | 200–400 MW simultaneously at full service |
| Ontario annual energy (Shinkansen benchmark) | ~560–750 GWh/year (Ontario portion) |
| Ontario grid demand growth forecast | 65% by 2050 (IESO 2026 APO) |
Applied to ALTO’s disclosed operating parameters, a conservative benchmark estimate yields annual Ontario energy consumption equivalent to the annual consumption of 50,000–60,000 Ontario households.
The Backbone Is Already Failing New
The bulk transmission backbone serving the ALTO corridor is not merely stressed — it is already at end-of-life and under-capacity today. The Gatineau Corridor consists of five 230 kV lines originally built in the late 1920s and early 1930s, stretching approximately 300 km between the Greater Toronto Area East and Ottawa through Peterborough — directly paralleling both ALTO corridor alignment candidates.
Approximately 800 km of 230 kV circuits are nearing end-of-life within 5–10 years. The Peterborough to Quinte West area load meeting capability is already insufficient today — before ALTO’s traction load is added. The $650 million remediation plan ensures Ottawa-area reliability only until 2037, well before ALTO reaches full service. ALTO’s traction load was not modelled.
The $650 million Gatineau Corridor remediation — the most expensive planned transmission investment in Eastern Ontario history — was designed without any input from ALTO. If ALTO’s 200–400 MW peak demand is not incorporated into the next planning cycle, this infrastructure will be undersized from the day ALTO opens. The $650 million will have been spent planning for a grid that cannot actually serve the corridor it physically parallels.
Northern vs. Southern Corridor: A Critical Asymmetry
The northern corridor (Highway 7 / Peterborough) benefits from the planned Durham Kawartha Power Line — a new double-circuit 230 kV line from Clarington TS to Dobbin TS, adding over 400 MW capacity, in-service 2029. No equivalent planned bulk transmission reinforcement exists along the southern corridor alignment between Kingston and Ottawa.
Active Grid Studies Proceeding Without ALTO’s Load
- IESO Eastern Ontario Bulk Planning engagement — ongoing 2024–2026; includes “Supply to Belleville” sub-study covering the zone the southern corridor runs directly through
- Hydro One Peterborough-to-Kingston IRRP — Needs Assessment completed December 2024; IRRP completion estimated November 2026 — after ALTO’s route selection date
- Hydro One St. Lawrence Needs Assessment — initiated Q1 2026
The 2026 IESO Annual Planning Outlook New
The IESO’s 2026 Annual Planning Outlook (published March 2026) revised the Ontario demand growth forecast to 65% by 2050 — down from 75% in the 2025 APO — reflecting US-Canada trade tensions and lower EV projections. Incremental capacity needs rise to 950 MW by 2035. ALTO’s traction load of 200–400 MW is not included in any scenario in either the 2025 or 2026 APO. The APO that will actually model the grid ALTO operates in has not yet been written.
The Timeline Mismatch
Hydro One’s Peterborough-to-Kingston IRRP — the most directly relevant grid study to the southern ALTO corridor — is expected to conclude in November 2026. ALTO’s route selection decision is expected to precede that date. The most important regional grid study for the southern corridor will be completed after the route decision has been made. If ALTO’s load has not been submitted to that process before its conclusions are drawn, the IRRP will not model the corridor that is actually being planned.
Land Expropriation Beyond the Rail Corridor
Traction substations for a 300 km/h HSR system are large, permanent industrial installations requiring dedicated land, 115–230 kV bulk transmission connections, access roads, and security perimeters. This dimension of ALTO’s infrastructure has received no public attention.
| Substation Scenario | Site Area / Substation | Total Substation Land |
|---|---|---|
| 12 substations (Imbleau figure) | 0.5–2 ha | 6–24 ha |
| 20 substations (lower technical) | 0.5–2 ha | 10–40 ha |
| 33 substations (upper technical) | 0.5–2 ha | 17–66 ha |
These figures do not include new bulk transmission line spurs — typically 30–45 metres wide for 115 kV — required to connect each substation to the existing grid in rural Eastern Ontario. On the southern corridor, karst terrain, wetland density, and the absence of existing 115–230 kV infrastructure compound these requirements significantly.
What ALTO Has Not Answered
- Has ALTO submitted electricity demand projections to IESO? If so, when, and have they been incorporated into the Eastern Ontario Bulk Planning engagement and the Supply to Belleville sub-study?
- What are the updated electricity demand figures for full 300 km/h HSR? The 2023 ATI documents predate the February 2025 pivot to true HSR.
- Has ALTO filed a System Impact Assessment application with IESO? If not, when will it do so?
- Has the Gatineau Corridor $650 million remediation plan been re-scoped to account for ALTO’s traction load? If not, who will fund the gap?
- Why does the “up to a dozen substations” figure appear low versus technical design standards? Is the 12-substation figure preliminary, corridor-specific, or based on a different technical architecture?
- Where will traction substations be sited, and what is the expropriation footprint including access roads and transmission line corridors?
- Who will pay for new 115–230 kV transmission lines required to supply traction substations in rural Eastern Ontario?
- What is the grid carbon intensity assumption underlying ALTO’s low-emission claim? By the time ALTO operates, marginal supply may not be hydro or nuclear.
Sources — Electrical
- Imbleau, Martin (ALTO CEO). Interview with Christopher Reynolds, The Canadian Press. February 8, 2026.
- Baccega Rosa, Tiziana (Hydro One). Statement to The Canadian Press. February 8, 2026. On-record confirmation that Hydro One had not received ALTO’s energy demand projections.
- VIA HFR 2023 electricity demand study overview. Referenced in Canadian Press ATI reporting, February 2026.
- IESO. Gatineau Corridor End-of-Life Study. December 2022. 800 km EOL; Peterborough–Quinte West already under-capacity; $650M plan; Ottawa reliability to 2037 only. ALTO load not modelled.
- Hydro One Networks Inc. 2025 Regional Planning Process Annual Status Report. OEB, October 31, 2025. EB-2011-0043.
- Hydro One Durham Kawartha Power Line Project. hydroone.com. Accessed April 2026.
- IESO. Eastern Ontario Bulk Planning engagement (active). “Supply to Belleville” sub-study.
- IESO. Annual Planning Outlook 2025. April 2025.
- IESO. Annual Planning Outlook 2026. March 2026. Demand growth revised to 65%; ALTO load not modelled.
- Ontario Bill 40 — Protect Ontario by Securing Affordable Energy for Generations Act, 2025.
- California HSR Authority. Technical Memorandum TM 3.1.1.3: Traction Power Facilities. Parsons Brinckerhoff, June 2010.
- Fritz, W. (2018). Energy consumption of track-based high-speed trains. Transportation Systems and Technology, 4(3).
- Hasegawa, I. et al. (2016). Standardised approach to energy consumption calculations for high-speed rail. IET Electrical Systems in Transportation.