Proceeding 27109 Register

Application status: complete

Decision: 27109-D01-2022, issued November 3

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The AUC has approved applications from TransAlta Alberta Hydro Inc. to construct and operate a 180-megawatt battery energy storage power plant in the Ghost Lake area, designated as the WaterCharger Battery Storage Project. The AUC issued Decision 27109-D01-2022 on November 3, 2022.

The power plant will be located in the southeast quarter of Section 13, Township 26, Range 6, west of the Fifth Meridian, approximately 15 kilometres west of the town of Cochrane. The map below identifies the applied-for location by TA Alberta Hydro Inc.


The AUC held a virtual oral hearing on August 3, 2022, at 10 a.m. to review the applications and submissions in this proceeding. The virtual oral hearing was held remotely via a video conferencing platform. All documentary evidence filed on the record of the proceeding is publicly available through the AUC’s eFiling System.

The AUC established the following process to consider the applications:

Process step Date (by 4 p.m.)
Interveners’ information requests to applicant May 30, 2022
Applicant’s responses to interveners’ information requests June 10, 2022
Interveners’ written evidence June 24, 2022
Applicant’s information requests to interveners July 4, 2022
Interveners’ responses to applicant’s information requests July 18, 2022
Applicant’s written reply evidence July 25, 2022
Hearing test session July 26, 2022
Hearing August 3 to August 5, 2022

The eFiling System​

The eFiling System should be accessed to view the applications and the other documents the AUC will be considering in this proceeding. The system is also used to file submissions and evidence to participate in the proceeding.

To create an account, select “New account” and follow the steps to create a user ID and password. If you have any questions about how to use the system please contact us at or 310-4AUC.

Documents considered in this proceeding can be found in the eFiling​ System (which requires log in). Once you have logged in, enter 27109 in the “go to” section at the top left corner of your screen.

WaterCharger Battery Storage Project