Tent Mountain Pumped Hydro Energy Storage

Highlights

320MW/4,955 MWh (15+ hours) Pumped Hydro Energy Storage

Powering up to 400,000 Albertan homes simultaneously

Will create up to 200 construction jobs and 30 full time operational jobs over an 80+ year project life

Up to 500,000 tonnes* of CO₂ emissions abated annually

* Assumes cycling once per day and powered by renewable electricity

PRE-FEASIBILITY STUDY CONFIRMS TM-PHES AS AN OUTSTANDING ENERGY STORAGE PROJECT WITH COMPELLING ECONOMICS

EVOLVE HAS FORMED PARTNERSHIP WITH TRANSALTA TO CO-OWN AND JOINTLY MANAGE THE TM-PHES

If the TM-PHES were operating right now, it would be:

PUMPING WATER UP TO STORE ENERGY

Water is pumped into the upper reservoir using low-cost energy when electricity demand is low or there is an excess of renewable energy.

When Alberta’s electricity demand spikes, or wind or solar power generation drops off, water is released from the upper reservoir.

The water flows quickly down the pipes which turns the turbines to generate power.

TM-PHES Project Status

On a $/MW (power output) and $/MWh (energy stored) basis, the TM-PHES compares favourably to similar PHES projects globally. PHES technology has a significantly larger capacity and duration and offers exceptional capital intensity when compared to other available energy storage options.

In 2022, Evolve completed a Pre-Feasibility Study (PFS) for the TM-PHES which found Tent Mountain is suitable for hosting a PHES with an 80+ year project life, 320 MW installed capacity, with a continuous generation duration of more than 15 hours, resulting in up to 4,955 MWh of energy storage.

In 2023, Evolve and its partner TransAlta Corporation completed a geotechnical investigation program for the TM-PHES. The geotechnical investigation program targeted the areas of the project that host the major infrastructure elements, namely, the upper reservoir, lower reservoir and dams, penstock route, and powerhouse. The data collected will be used to guide the final engineering design for the project, through a feasibility study and into FEED.

Project Life	80+ Year
Installed Capacity	320 MW
Storage Capacity	Up to 4,955 MWh
Continuous Generation Duration	15± hours
Upper Reservoir Active Volume	3.55 million m3
Upper Reservoir Minimum Operating Level	1,783m
Lower Reservoir Minimum Operating Level	1,480m
Maximum Gross Head	320m
Minimum Gross Head	288m

TM-PHES Grid Stability Benefits

RENEWABLES FIRMING

The TM-PHES can supply much needed energy when the wind is not blowing, and the sun is not shining

EXCESS SUPPLY

When the grid has too much renewable energy, the TM-PHES can absorb the excess power

TRANSMISSION CONGESTION

The TM-PHES is located near an existing transmission corridor and can help reduce congestion on major lines in the region

ANCILLARY SERVICES

The TM-PHES can respond quickly to unexpected disruptions on the grid

INERTIA

The TM-PHES will contribute inertia to the grid, which helps keep the frequency stable and avoid blackouts.