Southeast Asia Trails China on Solar and Storage as Grid Investment Gap Widens
Ember data shows Southeast Asia's solar and storage base too thin for the power demand growth the IEA expects the region to generate through 2030.
Ember's "The Age of Power" report, published on Wednesday (2026-09-16), put China's installed solar capacity at 1,202 GW against 38 GW across Southeast Asia, a ratio that sits at the centre of a mounting dispute over whether the region's electrification ambitions can survive contact with infrastructure reality.5
The battery storage numbers are more lopsided. China's grid-scale storage reached 144 GW; Southeast Asia managed 4.2 GW. South Asia had 0.8 GW. Developed Asian markets including Japan, South Korea, Australia, New Zealand, and Singapore combined reached just 24 GW. China's electric vehicle fleet stood at 44 million units, against 1.1 million in Southeast Asia and 2.2 million across those other developed markets.5
Demand projections make the gap harder to absorb. The IEA's Electricity 2026 report, published in May (2026-05-19), recorded global power demand growth at 3% annually in 2025, following 4.4% in 2024, and forecast more than 3.5% per year on average through the end of the decade. Emerging economies, including China, India, and Southeast Asia, will account for 80% of additional global power demand by 2030, the agency said.1
Meeting that demand requires grid investment the region is not currently making. The IEA said annual grid spending needs to rise roughly 50% from $400 billion to keep pace with projected consumption. IRENA set the bar higher still: transmission investment must climb from $500 billion per year to $1.2 trillion annually and hold there across the 2026-2035 period.1,2
For Southeast Asia, the shortfall is acute. The IEA has projected the region needs grid investment to nearly quadruple by 2050, with near-term transmission commitments required that most governments have yet to make, according to reporting from August (2026-08-22).3
Part of Ember's reported disparity traces to manufacturing concentration. China, Taiwan, South Korea, and Japan together account for 76% of global electrotech hardware production, spanning solar modules, battery cells, and related components. Markets outside that cluster import equipment at costs and lead times that constrain deployment rates regardless of policy commitment.5
Asia already generates over half the world's electricity and accounted for three-quarters of global electricity demand growth since 2000, Ember noted in a June (2026-06-23) analysis. The region has overtaken the West in aggregate electrification metrics. But within Asia, the gap between China and markets such as Indonesia and Vietnam has widened with each successive reporting cycle.2
Faster electrification in Southeast Asia would increase pressure on grids that are already strained. A June (2026-06-23) analysis found that accelerating EV adoption and grid-dependent energy systems would require swift action on transmission that current investment plans do not fully fund.6
The policy ambiguity compounds the physical problem. A September 18 (2026-09-18) article noted that the widely referenced 35% electrification target for 2035 still lacks a defined baseline — which sectors it covers and how progress will be calculated remain unresolved. Investment decisions are being structured around a metric that could be measured in materially different ways.7
Advanced economies in the region are not immune to demand pressure. The IEA projected Australia, Canada, Japan, and South Korea would all see faster electricity demand growth through 2030, reversing a decade of stagnation. EU demand is forecast at roughly 2% annually through 2030. The infrastructure starting point in these markets is stronger, but the demand trajectory is now converging with that of emerging Asian peers.1
Battery storage offers a partial offset. A September 14 (2026-09-14) market forecast put the on-grid battery energy storage market at $141.37 billion by 2035, with sodium-based chemistries gaining relevance where supply-chain diversification or longer discharge cycles are required. Storage added behind inadequate transmission does not resolve congestion. It relocates it.4
Southeast Asian governments have not yet committed capital at the scale the IEA's projections imply is needed over the next five years. Multilateral development bank pipeline announcements through 2027 are the next concrete indicator of whether the region can close part of the transmission gap, or whether the solar and storage ratios Ember measured in September 2026 will be larger still when the next data cycle runs.3,5