CITIC will provide a credit facility of about RMB8bn ($1.27bn) to ET Solar in the next five years for both general corporate and capital expenditure purposes.
The deal also covers various other commercial and investment banking services that CITIC will provide to ET Solar.
ET Solar CEO Dennis She said with credit support and other banking services that the bank provided to ET Solar in the past three years, the company has established a strong tie with CITIC.
"This strategic agreement is taking our relationship to the next level and positioning us advantageously in capturing the overall market growth and accelerating our strong momentum in European system business development," She said.
ET Solar is a vertically integrated producer and provider of photovaltaic modules and related solutions to the global solar market.