Dobbin Energy Storage Project: Notice of Public Open House and Study Commencement

September 16, 2025

Public Notices

Dobbin Energy Storage Corporation (“the Proponent”), a subsidiary of Northland Power Inc., is
developing a battery energy storage facility in the Township of Selwyn, County of Peterborough, Ontario.
The Dobbin Energy Storage Project (the “Project”) is being developed in response to the Long-Term 2
Capacity Services Request for Proposals (LT2(c-1) RFP) issued by the Government of Ontario through
the Independent Electricity System Operator (IESO). See Figure 1 for the proposed Project location at
Fifes Bay Road (County Road 12) and Lily Lake Road, Selwyn.

As part of this process, the Proponent is:

Requesting a Municipal Support Resolution (MSR) from the Township of Selwyn for the proposed
Project, which is a requirement for the LT2(c-1) RFP, and
Initiating a Class Environmental Assessment for Transmission Facilities (Class EA for TF) for the Project, which is a requirement of the Provincial permitting process, with Stantec Consulting Ltd. acting as the Project’s environmental consultant.

The Project is anticipated to consist of battery storage enclosures, electrical inverters and transformers,
internal access roads, electrical and communication cabling, a 230 Kilovolt (kV) transmission station (i.e.,
substation), other necessary electrical and infrastructure, and safety systems. With a planned Maximum
Contract Capacity of up to 200 megawatts (MW), the Project is anticipated to require a Project footprint size
of up to 35 acres and interconnection to the existing Hydro One Networks Inc. Dobbin Transformer Station
located southwest of the Project via a 230 kV connection line owned by the Project. The exact layout of the
infrastructure within the Project’s footprint and routing of the 230 kV connection line has yet to be confirmed
and will be determined through additional engineering studies, equipment procurement and completion of
the Class EA for TF. Routing to the Dobbin Transformer Station is anticipated to require a crossing of Fifes
Bay and Lily Lake roads.

The transmission station (i.e., substation) associated with the Project is subject to the Class EA for TF in
accordance with the Ontario Environmental Assessment Act. The Class EA for TF is a streamlined process
applicable to routine transmission projects that have predictable environmental effects that can be readily
managed.

The Project would improve reliability of the electrical transmission system in the region and across Ontario,
specifically addressing weak points in its capacity, efficiency and reliability, by charging during times of
reduced demand and discharging during times of peak demand.

Subject to the outcome of the LT2(c-1) RFP and project development timelines, construction is proposed to begin in 2027 with a planned in-service date in 2030.

Public Open House Details:

In line with the requirements of the IESO LT2(c-1) RFP, Township of Selwyn and the Class EA for TF, the Proponent will be holding an in-person Public Open House with details noted below. As a stakeholder with a potential interest in developments in the area, you are invited to provide comments on the Project.

Thursday, October 16th, 2025 from 6:00 PM - 8:00 PM

Peterborough Curling Club (2195 Lansdowne Street West, Peterborough)

A presentation by the Project Team will commence at 7:00 PM

We welcome your comments and feedback regarding the planned Project. Input received will be used to develop site specific environmental protection or mitigation measures for the Project. A reply by October 24, 2025 is appreciated.

If you have any questions, or would like additional information about this Project, please do not hesitate to contact the undersigned, or visit the Project website at https://www.dobbinenergystorage.com/. Information regarding the Freedom of Information and Protection of Privacy Act21 can be viewed below.

Britney Ellis, B.A. Hons.
Stantec Consulting Ltd.
Senior Associate, Project Manager
Phone: (289) 800-3522
britney.ellis@stantec.com

Rahim Rawji, MBA, P.Eng.
Northland Power Inc.
Director, Development
Phone: (647) 984-7239
Rahim.Rawji@northlandpower.com

Further information on the Project can be found at: www.DobbinEnergyStorage.com