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Independent power producer ContourGlobal has marked the start of construction on Project Sterling, a hybrid solar-plus-storage facility in Mohave County, Arizona, according to pv-tech.org. The project is privately funded, following the company’s securing of an equity bridge loan from an international banking syndicate.
Project Sterling pairs 450MWac of solar photovoltaic capacity with a 1.4 GWh battery energy storage system. The storage portion consists of 300 containers using lithium iron phosphate batteries. Once operational, the site is projected to produce more than 1.1 TWh of clean electricity annually.
Roughly 90% of the energy generated will be sold through a power purchase agreement with Tesla, signed in July 2026. That offtake arrangement is described as one of the largest hybrid solar-plus-storage agreements completed to date.
The installation will occupy more than 2,000 acres in one of the sunniest parts of the United States and is expected to be finished in 2028. Its infrastructure will include a 5.2 mile road linking the site to Route 66.
Antonio Cammisecra, president and chief executive of ContourGlobal, commented that the project is designed around the specific needs of the customer, enabling reliable clean power delivery for up to 16 hours a day by storing part of the solar output for use after sunset.
The groundbreaking took place a week after ContourGlobal finished construction of a 324MW solar facility in Colorado, which is currently the company’s largest operating solar plant.
Arizona ranks fourth among U.S. states for total installed solar capacity, with 13.2GW in place, according to the Solar Energy Industries Association. Since 2022, the state’s annual solar installations have increased to more than 2GW, most of it utility-scale. Arizona is expected to add 18.4GW of new solar capacity over the next five years.
Interactive table based on the Store Companies dataset for this report.
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Largest solar manufacturer globally
Leading monocrystalline silicon producer
Major module and cell producer
High-efficiency cell and module maker
Global manufacturer and project developer
Major player in US and EU markets
Integrated PV product manufacturer
Leading thin-film CdTe manufacturer
World's largest solar cell producer
ABC cell technology leader
Major LED component and display maker
Pioneer and major supplier of LED chips
Historically leading innovator in LED technology
Leading European optoelectronics supplier
High-power LED and automotive lighting
One of world's largest LED chip producers
Major LED packaging and component supplier
Leading Taiwanese LED chip manufacturer
Innovator in WICOP and SunLike technologies
LED components for automotive and IT
IBC cell technology leader
Solar project developer and manufacturer
Integrated PV manufacturer
Historically significant in both fields
Rapidly growing cell and module producer
Solar manufacturing arm of Chint Group
Module manufacturer with US focus
Leading Indian solar manufacturer
LED packaging and lighting solutions
Major LED packaging company
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