APAC data center developer DayOne has signed a renewable energy supply agreement with Malaysian electricity company Tenaga Nasional Berhad (TNB) for 1.5GW of solar capacity and 2.2GWh of battery energy storage.

The agreement was signed with TNB subsidiaries TNB Renewables and TNB Power Generation. The power is expected to be supplied by a mounted solar and hybrid hydro-floating solar (HHFS) project. TNB did not confirm which project would supply DayOne under the agreement. The electrical utility is planning a 2.5GW phased rollout of HHFS projects across various hydropower dam reservoirs in Malaysia. This includes a flagship 595MW project in Kenyir Lake, Terengganu, which is expected to be completed in late 2028.

“Today’s signing marks an important milestone in how we scale digital infrastructure responsibly,” said Jamie Khoo, CEO of DayOne. “As demand for AI and cloud infrastructure accelerates, securing long-term access to renewable energy is critical. We are proud to be TNB’s largest customer and contribute to the stability of the national grid. This partnership strengthens our ability to grow in Malaysia with greater energy resilience while supporting our customers’ sustainability ambitions.”

The agreement was signed under Malaysia’s Corporate Renewable Energy Supply Scheme (CRESS), a government initiative that seeks to support corporate entities with sourcing clean power directly from renewable developers. The agreements include both energy supply contracts and the transfer of renewable energy certificates (RECs) to support DayOne’s goal of achieving 100 percent renewable energy across its operations by 2030.

Datuk Ir. Ts. Shamsul bin Ahmad, president and CEO of TNB, said: “Through CRESS, we are facilitating greater access to sustainable and reliable energy solutions. TNB is proud to partner with DayOne in advancing a cleaner, more resilient energy ecosystem that supports Malaysia’s digital economy ambitions.”

The deal is not the first between the two companies. A year ago, DayOne signed a 500MW solar agreement with TNB to power its two data centers in the region, Nusajaya Tech Park, in Gelang Patah, and Kempas Tech Park, in Johor Bahru, which combined have a capacity of 120MW.

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

Its portfolio currently comprises more than 500MW of data center capacity in service and under construction, and more than 500MW held for future development across sites in Hong Kong, Singapore, Malaysia (Johor), Indonesia (Batam), and Japan (Tokyo).