Chilean utility Colbun SA has unveiled plans for a pioneering pumped-storage hydropower plant in northern Chile, set to harness the power of the Pacific Ocean to combat renewable energy curtailment.
According to a statement released on Friday, Colbun detailed its proposal for the Paposo pumped-storage hydro project, designed to establish a facility capable of storing and releasing excess renewable energy efficiently.
“The project aims to create a power station that will circulate desalinated water between its lower and upper reservoirs to store and release excess renewable energy that would otherwise be lost to curtailment,” Colbun stated.
The company has initiated the environmental impact study (EIS) process for the Paposo project, anticipating an investment nearing USD 1.4 billion (EUR 1.29bn) pending approval.
Situated in Taltal, Antofagasta region, the project capitalizes on the natural coastal terrain, with reservoirs strategically positioned atop a cliff and at its base.
“The upper reservoir would be located on the top of the cliff at 1,500 meters (4,921 ft) above sea level, with the lower reservoir situated at the foot of the cliff next to the turbine hall and a substation,” Colbun explained.
Water sourced from the ocean will undergo desalination, with a targeted intake rate and operational adjustments to account for evaporation and internal consumption.
Colbun's vision encompasses a comprehensive infrastructure plan, including a water catchment system, power lines, administrative facilities, and a visitor center.
“The Paposo plant is expected to be able to generate around 1,800 GWh and contribute to mitigating renewable energy curtailment in Chile,” the company asserted.
Currently undergoing a formal admission procedure, the EIS submission will determine the project's progression, with Colbun aiming for groundbreaking by mid-2026 and plant commissioning in the latter half of 2029.
