Proceeding 27109 Register

Application status: under review

Written evidence deadline: September 23, 2022​

Decision expected: To be determined

Watch an AUC hearing


The AUC is reviewing 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 a notice of hearing on May 16, 2022.

The power plant would 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.

Participating in the hearing

The AUC will host a virtual oral hearing, commencing on August 3, 2022, at 10 a.m. to review the applications and submissions in this proceeding. The virtual oral hearing will be held remotely using a video conferencing platform. Participants are responsible for ensuring that they have access to all documentary evidence filed on the record of the proceeding, either through the eFiling System or in their preferred format.

The AUC will also hold a test session on July 26, 2022, at 10 a.m., so that any technological issues can be detected and resolved in advance of the hearing. All hearing participants are required to participate in the test session. AUC staff will contact the hearing participants and will send email invitations that include the link to access the test session and hearing.

The AUC has established the following process to consider the applications:

Process stepDate (by 4 p.m.)
Interveners’ information requests to applicantMay 30, 2022
Applicant’s responses to interveners’ information requestsJune 10, 2022
Interveners’ written evidenceJune 24, 2022
Applicant’s information requests to intervenersJuly 4, 2022
Interveners’ responses to applicant’s information requestsJuly 18, 2022
Applicant’s written reply evidenceJuly 25, 2022
Hearing test sessionJuly 26, 2022
HearingAugust 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 being 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