ASEAN energy use per person rose far faster than its intensity improved
Between 2015 and 2025, ASEAN energy intensity eased from roughly 3.15 to an estimated 3.01 gigajoules per thousand 2021 US dollars at purchasing-power parity. Energy use per person rose from around 38 to 49 GJ. The figures appear in the IEA’s new regional energy-security review.
Original calculations: intensity fell about 4.4%; per-person use rose about 28.9%.
Two endpoints only; no annual path is implied.
The GDP denominator uses constant 2021 purchasing-power-parity dollars. IEA report, page 22, figure note
Two denominators, two different questions
Primary energy intensity divides total energy supply by GDP. It asks how much energy accompanies a unit of measured production. Per-capita use divides energy by population. It asks how much energy is used, on average, for each resident. A decline in the first measure can occur alongside an increase in the second when output per person expands sufficiently.
Neither ratio by itself isolates the performance of a motor, building or appliance. The composition of economic activity can change; different sectors can have different energy needs. A region-wide intensity improvement should therefore be described as an aggregate result, rather than attributed entirely to better equipment or any single policy.
Reproduce the changes and choose the right indicator
| Measure | Calculation | Result |
|---|---|---|
| Energy intensity | (3.01 ÷ 3.15 − 1) × 100 | −4.44% |
| Energy per person | (49 ÷ 38 − 1) × 100 | +28.95% |
Use intensity for questions about the relationship between energy and output. Use per-capita consumption for average use relative to population. For a utility’s equipment needs, also examine actual electricity demand and peak loads. For fuel security, inspect the relevant fuel balance and supply route. The two ratios cannot answer those separate questions on their own.
Why this matters for supply planning
The report records annual clean-energy investment rising from US$30 billion to US$47 billion over the decade. Regional energy profile
Demand and investment describe different parts of an energy system. Demand is a flow of energy; investment is spending intended to support future assets and services. Higher spending does not automatically reveal when usable capacity will arrive, how much it will produce, or whether it is located where demand grows. A useful assessment connects those stages rather than treating an investment total as an immediate supply increase.
The IEA’s recommendations include stronger efficiency standards and enforcement, financing, and demand flexibility through metering and time-sensitive pricing. It also supports closer regional coordination and electricity connections that can share resources and reserves.
For an industrial energy buyer, the distinction suggests two workstreams. One examines energy needed per unit of its own production, where operational improvements may be measurable. The other examines procurement, peak demand and continuity of supply. A factory could improve the first metric while expanding fast enough to need more total electricity. Reporting both prevents an efficiency success from hiding a growing capacity requirement.
What the comparison cannot establish
The arithmetic is descriptive. It cannot determine how much demand would have grown without efficiency improvements, allocate the change to particular countries, or estimate the savings from a proposed project. Those questions require a counterfactual or more detailed evidence. The region’s aggregate ratios should not be used as a performance target for every business. A reader comparing two countries would also need consistent definitions and price bases. A company comparing two plants would need comparable products and operating conditions. Without those checks, a neat ranking can conceal a mismatch in what is being measured.
The report was released on 6 October 2026, while the comparison concerns the preceding decade. Several 2025 figures are estimates. A useful monitoring plan states the question first, then selects an indicator with the appropriate numerator, denominator and period. Keeping those choices visible makes comparisons easier to challenge and update.
