Southeast Asia Solar ESS Market: Indonesia, Vietnam, Thailand 2026
Southeast Asia is emerging as one of the most dynamic solar energy storage markets in the world, driven by rapid economic growth, expanding electricity demand, improving renewable energy economics, and government policies that are increasingly supportive of solar-plus-storage deployment. With solar irradiance of 4.0 to 5.5 kWh per square metre per day across the region and a combined population exceeding 680 million, the ten ASEAN member states represent a combined addressable market for energy storage that is projected to exceed USD 8 billion by 2030.
Indonesia: The Archipelago Opportunity
Indonesia, with 280 million inhabitants spread across 17,000 islands, presents the most complex and potentially the largest battery storage opportunity in Southeast Asia. The country electricity grid is severely constrained, with Java-Bali accounting for over 70% of national electricity generation while outer islands rely heavily on expensive diesel generation. Approximately 60 million Indonesians remain without reliable electricity access, creating a substantial off-grid solar-plus-storage market.
The government PLN (Perusahaan Listrik Negara) has set a target of 23% renewable energy in the national energy mix by 2025, driving aggressive solar tender activity across Java, Sumatra, and the eastern islands. The national solar auction programme has attracted international developers including ACEN (Philippines), Sembcorp (Singapore), and Masdar (UAE), all of whom are deploying solar-plus-storage projects with battery requirements. PLTS (Solar PV plants) with capacities of 10 MW to 100 MW are increasingly paired with 2 to 4 hours of battery storage to manage evening peak demand and reduce curtailment.
For telecom tower operators in Indonesia, the off-grid opportunity is particularly compelling. Indonesia telecom operators (Telkomsel, Indosat Ooredoo Hutchison, and XL Axiata) collectively operate over 70,000 base station sites, with approximately 40% located in areas with unreliable grid supply. Each off-grid tower requires a battery bank sized for 24 to 48 hours of autonomy, creating sustained demand for deep-cycle lead-acid batteries. CHISEN OPzV 2V cells are widely specified by Indonesian telecom infrastructure companies for their superior hot-climate performance and long cycle life.
Indonesia regulatory body, MEMR (Ministry of Energy and Mineral Resources), requires SNI (Standar Nasional Indonesia) certification for electrical equipment sold in the country. CHISEN is actively pursuing SNI certification for its VRLA AGM and OPzV ranges through its Indonesian distribution partner, with completion targeted for Q4 2026.
Vietnam: The Manufacturing Hub Goes Solar
Vietnam has experienced remarkable economic growth over the past decade, with GDP growth averaging 6 to 7% annually and electricity demand growing at 8 to 10% per year. This demand growth has outpaced new generation capacity, creating regular power shortages in the north that have prompted the government to accelerate renewable energy deployment. Vietnam installed over 18 GWdc of solar PV by 2025, making it one of the world fastest-growing solar markets.
The Vietnamese government EVN (Electricity Vietnam) has been the primary offtaker for utility-scale solar projects, with feed-in tariffs of VND 1,644 to 2,116 per kWh (approximately USD 0.065 to 0.085 per kWh) driving rapid project development. Battery storage requirements in Vietnam are emerging primarily from grid balancing needs and from the commercial and industrial (C&I) sector, where factories and commercial buildings are deploying behind-the-meter storage to reduce demand charges and ensure power quality.
Vietnam battery market is characterised by strong domestic manufacturing presence (Tick id=94, Long Gian, Chilwee Vietnam), combined with import competition from China, Korea, and Japan. CHISEN competes in the Vietnamese market primarily through its authorised distributor network, supplying deep-cycle batteries for solar applications and motive power applications including electric bicycles and e-rickshaws.
Thailand: The Regional Hub for Solar Manufacturing
Thailand has established itself as Southeast Asia leading solar manufacturing hub, with over 5 GWdc of installed solar capacity and a growing domestic market for solar-plus-storage applications. The Thai government Energy Absolute programme targets 30% renewable energy by 2037, with battery storage identified as a key enabler for grid stability as variable renewable penetration increases.
Thailand regulatory framework for energy storage is among the most developed in ASEAN, with the Energy Regulatory Commission (ERC) issuing grid-connected battery storage regulations in 2022 and subsequent updates in 2024. This regulatory clarity has attracted investment from international storage developers and created a procurement pipeline for battery systems in both utility-scale and C&I applications.
CHISEN Thailand distributor, based in Bangkok, supplies the CHISEN VRLA AGM and OPzV ranges to solar installer companies and telecom operators across the country. The Thai telecom market, served by operators AIS, TrueMove, and DTAC, is deploying approximately 3,000 to 5,000 new tower sites per year, with battery backup requirements driven by the hot and humid climate that accelerates lead-acid battery degradation.
Regional Market Entry Strategy
Successful market entry in Southeast Asia requires local partnerships, competitive pricing, and certification coverage across the major markets. The ASEAN Electrical and Electronic Equipment (AEEX) mutual recognition arrangement facilitates market access across member states, but country-specific certifications (SNI in Indonesia, Vietnam standards, Thai standards) are still required for most applications.
CHISEN approach to the Southeast Asian market combines direct distributor relationships with technical support and training programmes. Our Indonesian partner in Jakarta maintains stock of the most popular SKUs, providing next-day delivery to customers across Java, Sumatra, and Kalimantan. Our Vietnamese distributor in Ho Chi Minh City serves the southern market, with a secondary partner in Hanoi covering the north.
The most significant opportunity for CHISEN in Southeast Asia is the combination of solar energy storage and telecom battery applications. The region demand for both applications is growing at 20 to 30% annually, driven by economic development, urbanisation, and government support for renewable energy. CHISEN full product range, covering 12V blocks from 7Ah to 230Ah and 2V cells from 100Ah to 3,000Ah, positions us to serve both segments with a single, established product platform.
Contact the CHISEN Southeast Asia team at sales@chisen.cn or WhatsApp +86 131 6622 6999 to discuss your solar energy storage and telecom battery requirements.
📧 Email: sales@chisen.cn | 📱 WhatsApp: +86 131 6622 6999 | www.chisen.cn