Key takeaway

For the very first time, Hydro-Québec has released a detailed power grid capacity mapping, giving project developers and large electricity consumers clearer insight into areas where new connections to the grid are feasible, and where strain on the system could also pose a significant risk. This initiative marks a notable step forward in transparency and project planning.

What information does the capacity mapping provide?

The mapping shows:

  • Hydro-Québec's current capacity to connect industrial projects to its transmission system; and
  • areas that could accommodate new wind power projects under the next calls for tenders.

The mapping does not reflect Hydro-Québec's overall energy capacity, but rather the areas where projects can connect to the existing grid, as of December 2025.

Map of the potential for integrating wind energy into Hydro-Quebec's electricity transmission network

Source : Hydro-Québec

Power grid capacity—what’s at stake?

Currently, insufficient power system capacity is one of the main reasons behind delays, downsizing and the cancellation of power and electrification projects. Insufficient capacity at the connection point may:

  • lead to reduced or restricted production, or forced shutdowns;
  • require major investments in the grid’s infrastructure;
  • delay the commissioning of new phases by several years; and
  • jeopardize project profitability and internal rate of return.

In many cases, projects fail (or face significant delays) not because of land tenure, financing, or permit-related issues, but rather due to grid capacity issues that are identified too late during the development process. Understanding a power grid’s capacities is a key element of project due diligence, particularly when it comes to helping developers mitigate the following risks:

  • Financial risk: Connection limitations and grid reinforcement costs can render a project unviable.
  • Deadlines: Grid reinforcement work often cause significant delays.
  • Operational constraints: Connection or capacity limitations often require technical adjustments, including the use of energy storage or demand management.

The power grid capacity mapping published by Hydro-Québec is a key tool that can help reduce these risks, improve project design, and avoid unexpected costs and delays.

If you have any questions or would like to discuss how this mapping may impact your projects, please contact the authors.