Cerro Dominador CSP developer plans larger plants in Chile
The ground-breaking 110 MW Cerro Dominador CSP plant could start commissioning by end of 2019 and the fund-owned developer is studying larger projects at three other sites in northern Chile, Francisco Vizcaino, Project Director at Cerro Dominador, told New Energy Update.
After a troubled start, Latin America's first utility-scale CSP plant is now in the final stages of construction.
Located in Chile's Atacama desert, the 110 MW Cerro Dominador CSP tower plant features a record 17.5 hours of molten salt thermal energy storage capacity. The project will be joined to an operational 100 MW PV plant at a total cost of $1.3 billion. The combined facility will be capable of supplying power 24 hours a day, mainly to serve mining facilities.
Cerro Dominador forms part of Chile's plan to generate 60% of its energy from renewable sources by 2035. The project was awarded a 15-year power purchase agreement (PPA) in 2014 at a price of $114/MWh.
Owned by funds managed by EIG Global Energy Partners, Cerro Dominador is being built by an EPC consortium owned by Acciona (51%) and technology supplier Abengoa (49%).
In July 2018, Acciona and Abengoa resumed construction of the plant following a two-year stoppage. The project was halted in 2016 when Abengoa, originally co-owner of the project and EPC supplier, underwent financial restructuring and transferred its stake to EIG.
Over the last year, the EPC partners have overcome project restructuring and supply chain reactivation challenges and the project is on target to achieve commercial operations by May 2020, Vizcaino told New Energy Update.
“Commissioning activities are set to commence by close-2019,” he said.
Chile power generation, consumption
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Source: International Energy Agency's Chile energy policy report, 2018
The successful completion of Cerro Dominador should boost investor confidence and spur further CSP deployment in Chile.
The Cerro Dominador partners are currently assessing potential CSP projects at three other sites in northern Chile, Vizcaino said.
“We are conducting DNI measurements, environmental studies and talking with the relevant authorities and communities,” he said.
The projects would deploy larger scale tower technology than Cerro Dominador to gain economies of scale and feature less storage capacity to maximize competitiveness across evening peak demand hours, Vizcaino said.
"A 9 to 13-hour [storage] range would be optimum,” he said.
Almost two years after taking control of Cerro Dominador, Washington-based EIG signed a signed a $758 million financing deal in May 2018 with a group of Chilean and international banks.
The financing deal allowed Acciona and Abengoa to restart construction in July 2018 under a new joint EPC group, in which Acciona is leading construction and Abengoa acting as technology partner.
“Reactivating the project has been the biggest development challenge,” Vizcaino said.
The new EPC partners had to gain the backing of the new group of investment partners, he noted.
The partners also had to regain the faith of contractors and suppliers after a two-year gap in works, Vizcaino said.
"The new EPC contractor had to work very hard to give them the confidence to come back into the project at the same conditions as originally contracted,” he said.
The suspension also halted stockpiling of materials and equipment, creating additional logistical supply chain challenges for components such as turbines and receiver materials.
Chile's strict labor regulations and strong union representation have also been a key challenge for the construction partners, testing project management and construction flexibility, Vizcaino said.
The Acciona-Abengoa consortium has employed around 1,000 construction workers for the project.
“Chile is very strict with the working shifts and labour conditions, which is necessary to protect our labour interest,” Vizcaino said. “However, it requires higher management standards and planning skills from the EPC Contractor.”
There is currently around 3.3 GW of active CSP projects in Chile but most of these projects stalled in early development and Cerro Dominador 1 is the only project to have reached financial closure, data from New Energy Update's CSP Global Tracker shows.
Since Cerro Dominador, CSP developers have not managed to acquire sufficient power purchase agreements (PPAs) to back the financing of their projects.
Chile has implemented competitive power generation tenders, pitching competing renewable and gas-fired technologies against each other.
Global CSP prices have fallen dramatically in recent years but remain above the price of PV and wind projects.
Global levelized costs for solar, wind in 2010-2022
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Source: International Renewable Energy Agency report,'Renewable power generation costs in 2018' (May 2019).
CSP's main advantage is cost competitive thermal energy storage, providing renewable energy that can be dispatched across long periods at lower prices than battery-coupled facilities.
Structural market limitations could also work in CSP's favour going forward. PV capacity has increased rapidly in recent years, causing regional oversupply due to limited grid capacity. This has depressed power prices and forced curtailments.
According to Vizcaino, wind power is the "nearest competitor" to CSP in the renewable energy space, because of its capacity to generate at night.
"But it cannot be compared against CSP versatility, assuring constant and sustainable electricity supply," he said.
CSP rivals gas-fired generation in terms of dispatchability and the Cerro Dominador partners will aim to beat the price of gas-fired generation in future public tenders, Vizcaino said.
“We have the best solar resources in the world," Vizcaino said. "And a flat energy demand curve because of the 24-hour requirements from the mining industry, which CSP can meet through thermal storage,” Vizcaino said.
By Kerry Chamberlain