2021-011 - Transformer Whitehorse Interconnection

The Battery Energy Storage System (BESS) was identified in the 2016 IRP as a medium-term solution to partially address the capacity shortfall. The BESS project is proceeding and is forecasted to be in service in Q4 2022. As a result of the BESS project, interconnection facilities are required in order to connect to the Yukon Integrated System.

A decision was made to connect the BESS to S171 in order to avoid creating a new N-1 and triggering the need for additional firm capacity. Additionally, as the BESS interconnection line will be passing by the LNG facility, there is an opportunity to move the LNG interconnection to S171 at the same time as this project, which should mitigate future N-1 constraints.

The S171 footprint and its control building will need to be expanded as part of the interconnection project and will include a power transformer to interface between the BESS & the LNG plant and the transmission system.