ADB Supports Cambodia’s Renewable Energy Transition with Major Battery Storage Project

PHNOM PENH, Cambodia, June 24, 2026 — The Asian Development Bank (ADB) has approved a US$63.44 million financing package to support the development of a utility-scale battery energy storage project in Cambodia, strengthening grid stability, improving energy security and enabling greater integration of renewable energy into the country’s power system.

The project will support the construction of a 250 MW / 500 MWh battery energy storage system (BESS) at the Takeo substation, south of Phnom Penh. The facility will store excess renewable electricity and dispatch it back to the grid when needed, helping manage peak demand, stabilize power fluctuations and improve the reliability of electricity supply.

Financing and Project Overview

The US$63.44 million financing package comprises a US$40 million concessional loan and a US$5 million grant from ADB through the Asian Development Fund, alongside US$12.44 million in financing from the Green Climate Fund and US$6 million in co-financing from the United Kingdom through the ASEAN Catalytic Green Finance Facility.

The project will support Cambodia’s target of achieving a 70% renewable energy share in installed power capacity by 2030. By improving grid flexibility, the battery storage system is expected to facilitate the integration of additional solar and other renewable energy sources while reducing pressure on the transmission network.

The initiative will also strengthen cross-border electricity trade and grid interconnection with Viet Nam, contributing to the broader ASEAN Power Grid vision of more integrated regional electricity systems by 2045.

Strengthening Grid Flexibility and Energy Security

Cambodia’s electricity demand continues to grow alongside the expansion of industrial zones, agro-processing facilities and urban areas. At the same time, increasing renewable energy generation is creating a greater need for flexible grid infrastructure capable of balancing supply and demand.

Battery energy storage can help address this challenge by storing electricity when renewable generation is abundant and releasing it during periods of higher demand. This flexibility can improve the utilization of renewable energy resources while supporting more stable and reliable power system operations.

Beyond infrastructure development, the project will support Electricité du Cambodge (EDC), Cambodia’s state-owned electricity utility, in strengthening its capacity to manage advanced energy systems. It will also support the development of battery storage regulations and technical skills, including initiatives to increase women’s participation in the energy sector.

Implications for Southeast Asia’s Energy Storage Market

The project highlights the growing role of utility-scale battery storage in Southeast Asia’s energy transition. As countries across the region expand solar and other renewable energy capacity, investment in grid-scale storage and transmission infrastructure is becoming increasingly important for managing intermittency and maintaining system reliability.

The financing structure also illustrates how multilateral development banks, climate funds and government-backed facilities can help mobilize capital for emerging energy infrastructure projects.

For developers, technology providers, investors and lenders, Cambodia’s project offers an example of how energy storage can support renewable energy integration, strengthen electricity networks and facilitate regional power trading.

As Southeast Asia continues to develop its renewable energy infrastructure, regulatory frameworks, financing mechanisms and grid readiness will remain important factors shaping the deployment of large-scale battery energy storage systems.