Thunder Bay Hydro Coporation

Serving the City of Thunder Bay with electricity.

Generating Power

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Generating electricity for use by Thunder Bay Hydro’s distribution system can take on many forms.  Typical generation options available to our customers include 'islanding' and 'parallel' generation.

Islanding Generation

GenerationCircles.pngAlso called Stand-by, or off-grid generation, the electricity generated by these systems is electrically isolated from Thunder Bay Hydro’s distribution system at all times.  Special devices are required to guarantee isolation (required for the safety of equipment and personnel) and are detailed by the Electrical Safety Authority, and within our Conditions of Service.

Parallel Generation

The electricity generated by these systems is electrically connected to Thunder Bay Hydro’s distribution system.  As these types of projects consume system resources, including; thermal capacity, short circuit capacity, and minimum loads for anti-islanding, proponents of these types of system must apply to Thunder Bay Hydro to ensure that capacity for the project is available, and that it is appropriately allocated once approved.  Devices to establish guaranteed isolation, to inhibit islanding, to accurately meter electricity, agreements to cover connection costs, as well as operating and maintenance requirements; are some of the many requirements associated with these types of generators.  The process for connecting these types of projects is outlined in detail below.   Note that the process and requirements vary depending on the size of project.

Generator Classification Rating  
Micro  ≤ 10 kW
Small   (a) ≤ 500 kW connected on distribution system voltage < 15 kV (b) ≤ 1 MW connected on distribution system voltage ≥ 15 kV
Mid-Sized  (a) ≤10 MW but > 500 kW connected on distribution system voltage < 15 kV (b) > 1 MW but ≤ 10 MW connected on distribution system voltage ≥ 15 kV
Large  > 10 MW

Parallel Generation Connection Process

Access Details for Connecting Parallel Generation.

Embedded Generation Inquiries

Joe McVety, P.Eng
Distribution Engineer
(807) 343-1037
jmcvety(at)tbhydro.on.ca