Climate Governance Loosens, Coal Cushion Persists, and the Rupiah Adaptation Bill

Rupiah Stability Watch · 2026-09-16

The premise

The latest climate-governance signal is real, but it should be read carefully. The United States has moved to repeal greenhouse-gas limits for coal- and gas-fired power plants: DW reported the EPA repeal as the “largest power sector deregulation action ever,” while the EPA’s own release says coal production for power-sector use is expected to increase by more than ten times. Grist framed the repeal as toppling the last pillar of the prior US climate agenda and delaying the phaseout of coal.

For the rupiah, the point is not that one US regulatory action moves USD/IDR. That would overstate the evidence. The point is narrower and more useful: when climate governance loosens while heat, haze, and energy stress remain visible, Indonesia’s external-balance ledger is pulled in two directions at once.

One direction is supportive in the near term. Coal and fossil-fuel demand may remain stronger for longer than a clean-transition narrative assumed, preserving part of Indonesia’s export cushion. The other direction is costly. Adaptation, health protection, cooling, grid reliability, fuel-import exposure, logistics disruption, and public records become operating expenses rather than tail risks.

Rupiah Stability Watch has already treated these as two sides of the same ledger. “Coal Demand Transition and the Rupiah” argued that coal remains an FX cushion, but not permanent armor. “Past 1.5°C” argued that climate costs become recurring operating variables. The September 15 weekly monitor put oil-subsidy arithmetic and haze measurement gaps in the same frame. This piece extends that arc: a longer fossil cushion is useful only if it buys Indonesia time to reduce the next bill.

Data box: the ledger as of this signal

What the evidence supports

The coal cushion persists. The IEA’s 2026 coal update says global coal demand reached a new record in 2025, even as China and India saw coal-fired power generation decline. That combination matters: coal can be structurally challenged in some places and still remain large enough globally to support exporters. The IEA’s price page also notes that higher gas prices made coal more competitive for power generation and that regulatory uncertainty and export-related measures in Indonesia added price pressure, especially for low-calorific coal.

Southeast Asia is still part of the demand story. The IEA’s Coal 2025 executive summary says the fastest coal-demand growth to 2030 is expected in Southeast Asia, above 4% per year. The 2026 Southeast Asia outlook adds a more specific warning for Indonesia: coal remains a mainstay of power generation, Indonesia remains the dominant regional supplier, and rising domestic demand absorbs a larger share of production. That means the export cushion can persist and narrow at the same time.

The adaptation bill is not abstract. Indonesia’s Green Climate Fund country programme document cites USD 77.81 billion of adaptation financing needs for 2021–2030 and USD 309.17 billion to 2050, with an explicit caveat that climate losses are still undervalued because not all loss variables are included. That is the operating ledger in one number: the bill is large, recurring, and likely understated.

The subsidy channel is already live. Tempo reported that subsidies and compensation reached Rp51.5 trillion by Feb. 28, 2026, and quoted Deputy Finance Minister Suahasil Nazara saying realization is influenced by ICP, rupiah depreciation, and volumes of fuel, LPG, and electricity. The Business Times reported a 2026 energy subsidy and compensation budget of Rp381.3 trillion, built around an administered-price shock-absorber posture. That is why oil shock and climate shock cannot be kept in separate files. Heat raises cooling demand. Fuel and electricity subsidies absorb part of the pressure. The rupiah is then exposed through both import needs and fiscal credibility.

Haze makes the same point in public-health language. NPR/AP reported August 2026 fires through Sumatra and Kalimantan, haze crossing into Malaysia and Brunei, transport disruption, public-health threats, 72 arrests, and four companies under investigation. This does not prove a currency effect. It does show why “When the Haze Record Has Holes” matters: if fires, PM2.5 exposure, enforcement, school closures, port disruption, and health cases are not measured cleanly, markets and households are asked to trust a ledger they cannot inspect.

What the evidence does not support

It does not support saying the US power-plant repeal caused a rupiah move. The transmission is too indirect, and the exchange rate has many larger near-term drivers: dollar rates, Bank Indonesia policy, oil prices, portfolio flows, fiscal credibility, current-account expectations, and domestic politics.

It does not support treating coal as permanent armor. Coal can support exports while still leaving Indonesia exposed to price cycles, buyer concentration, domestic obligation rules, river/logistics disruptions, climate diplomacy, and future demand shifts. A cushion is not a strategy.

It does not support treating adaptation as discretionary spending. The costs arrive whether or not they are budgeted: in hospitals during haze, in air-conditioning load during heat, in fuel imports during power stress, in port and road maintenance after floods, in crop losses and food prices, and in household purchasing power when administered prices cannot absorb the full shock.

The tradeoff

The tempting reading is simple: weaker climate governance means coal lasts longer, and Indonesia gets more time. The better reading is less comfortable.

A longer coal cushion can make today’s external balance look safer while making tomorrow’s operating ledger more expensive if the proceeds are not converted into adaptation and capability. The cushion is useful only if it is spent like a temporary windfall, not mistaken for a permanent floor.

That means the rupiah question is not “coal or climate.” It is “what does Indonesia do with the remaining years in which coal still pays?”

If the answer is more current spending, poorly targeted subsidies, thin fire records, slow grid investment, and imported cooling equipment, the country gets the worst version of the tradeoff: fossil revenue without resilience. If the answer is adaptation finance, clean reliability, local equipment capability, peatland enforcement, public air-quality records, and grid flexibility, the fossil cushion can buy down future FX and fiscal pressure.

The least-harm path

A least-harm path would not pretend Indonesia can switch off coal receipts overnight. It would put a fence around the cushion.

First, publish an explicit “coal cushion to adaptation” account. When coal prices or receipts outperform budget assumptions, a visible share should be assigned to adaptation, public-health protection, grid reliability, and local clean-energy capability. The point is not moral purity. It is balance-sheet discipline.

Second, make the haze ledger inspectable. Public PM2.5 coverage, fire hotspots, enforcement actions, school closures, clinic loads, port delays, and transport disruption should be posted in a form that households, investors, local governments, and researchers can audit. Measurement is not a communications accessory. It is confidence infrastructure.

Third, treat cooling demand as energy security. The IEA’s warning that Southeast Asian air-conditioner stocks are set to triple by 2035 should sit inside power planning, building codes, appliance standards, subsidy design, and grid investment. Heat adaptation that depends on inefficient imported equipment and subsidized fossil power is a rupiah exposure.

Fourth, retarget energy support before the next shock forces it. Subsidies may be necessary as shock absorbers. But if they expand mechanically with oil prices, exchange-rate depreciation, and electricity volume, they crowd out the very investments that reduce future shocks. Protection should move toward households and essential services, not blanket fuel demand.

Fifth, use coal’s remaining export role to build non-coal capability. That means transmission, storage, geothermal delivery, domestic components where they are genuinely competitive, port resilience, climate-health systems, and food-security buffers. A rupiah stability strategy should ask what import bill is avoided five years from now, not only what export receipt is earned this quarter.

What I’m uncertain about

The scale of the US repeal’s effect on global coal demand is uncertain. US policy can influence expectations and technology pace, but Asian demand, gas prices, Chinese and Indian power dynamics, financing conditions, and domestic Indonesian rules matter more directly to Indonesia’s coal ledger.

Indonesia’s current adaptation-spending execution is harder to verify than the headline financing need. The USD 77.81 billion and USD 309.17 billion figures are useful because they size the problem, but they do not prove that money is being allocated, spent well, or reaching the highest-risk districts.

The haze cost channel is visible but still under-measured. The retrieved record supports public-health and transport disruption, arrests, and cross-border haze. It does not give a complete rupiah-denominated cost for the 2026 episode. That absence is itself part of the confidence problem.

The bottom line

Looser climate governance can extend the coal cushion. It cannot cancel the adaptation bill.

For the rupiah, the risk is not that Indonesia earns from coal. The risk is that temporary fossil support is treated as proof of safety while heat, haze, cooling demand, fuel subsidies, and climate finance needs keep compounding off-ledger. The steadier path is to spend the cushion before the bill spends itself.