APAC data center firm DayOne has secured up to 500MW of solar power over 21 years from utility company Tenaga Nasional Berhad (TNB) to power its operations in Malaysia.

The solar power will be provided by TNB’s renewable power subsidiary and power DayOne’s Nusajaya Tech Park, in Gelang Patah, and Kempas Tech Park, in Johor Bahru, which have a combined capacity of 120MW.

“Sustainability is core to how we build, operate, and grow. We’re embedding ESG principles across our value chain - from renewable energy transition to helping our customers decarbonize AI and cloud workloads,” said Jamie Khoo, CEO of DayOne.

The agreement was signed under the Corporate Renewable Energy Supply Scheme (CRESS), an initiative launched by the Malaysian Ministry of Energy Transition and Water Transformation in September 2024. CRESS permits corporations to directly contract power from renewable energy developers for electricity while paying a system access charge to the grid system operator for grid access.

DayOne is the first corporation to sign a Bilateral Energy Supply Contract under the CRESS framework. The partnership builds on an Electrical Service Agreement and Memorandum of Understanding with TNB, signed in 2024.

Datuk Ir. Megat Jalaluddin Megat Hassan, president and CEO of Tenaga Nasional Berhad, called the agreement “a powerful signal of how a strategic collaboration can unlock reliable and scalable clean energy solutions for Malaysia’s most demanding digital infrastructures, including hyperscale data centers.”

DayOne was originally formed as the international unit of Chinese operator GDS. At the start of the year, it was spun off into a separate business and rebranded as DayOne, following the completion of a series B funding round.

DayOne’s portfolio comprises approximately 480MW of data center capacity in operation and under construction. It also has an additional 590MW slated for future development across sites in Hong Kong, Singapore, Malaysia (Johor), Indonesia (Batam), and Japan (Tokyo). The company recently broke ground on a site in Thailand.

Earlier this week, DayOne closed a RM 15 billion ($3.54 billion) equivalent multi-currency financing for sustainable digital infrastructure funding. It also secured a $412m loan for its planned Batam data center campus in Indonesia earlier this month.