Update: Power Demand +3.6% — Renewables Widen Lead, but Coal Rebounds +1.4%

What changed since the Ember / IEA WEI update

Our Q3 energy-systems update closed on two official prints: Ember’s Global Electricity Review 2026, which showed all renewables at 33.8% of world generation overtaking coal at 33.0%, with fossil generation falling 0.2% and clean sources meeting all 2025 demand growth; and IEA World Energy Investment 2026, which put total energy capex at $3.4T with clean near $2.2T versus fossils $1.2T. That post answered the census + capital question after the EI Statistical Review flow update.

This August refresh answers the next vintage the electricity market actually trades on mid-year: what does the IEA Electricity Mid-Year Update 2026 rewrite once H1 actuals and a Strait of Hormuz / LNG shock enter the 2026–2027 forecast? Three meters force the rewrite. Global electricity demand accelerates to 3.6% in 2026 and 3.8% in 2027 (from 3% in 2025), lifting consumption from 28,600 TWh toward 30,700 TWh. Renewables are set to become the world’s largest generation source in 2026 and widen to 37% of the mix by 2027. And — the punchline that breaks the Q3 fossil-halt story — coal-fired generation rises 1.4% in 2026 as high gas prices drive gas-to-coal switching, while gas-fired output stays broadly flat and power-sector CO₂ rises about 1% before plateauing in 2027.

The dashboard above is built as an August mid-year vintage delta: demand path, regional growth, fuel-outlook diverging bars, RE/VRE share areas, wholesale LNG-exposure split, and flexibility scatter. It is not a second Ember encyclopedia or a new Statistical Review of primary energy.

The headline table: Q3 Ember/WEI vs IEA Mid-Year Update

Read the coal row carefully. The Q3 post correctly celebrated Ember’s 2025 crossover and fossil generation halt. The Mid-Year Update does not reverse the renewables lead — it widens it — but it does reverse the one-year fossil-halt framing for 2026 once Hormuz-linked gas prices re-open coal’s dispatch stack. Averaging “renewables are winning” with “coal is declining forever” is how desks get lied to after a security shock.

Demand accelerates even under an energy-security tax

Toggle Panel → Demand path. IEA’s mid-year print lifts the growth path from 3% in 2025 to 3.6% in 2026 and 3.8% in 2027, taking world electricity consumption to 30,700 TWh. Structural drivers — industry, appliances, EVs, heat pumps, air conditioning, and data centres — keep pushing through higher generation costs and emergency conservation in some LNG-importing emerging markets.

The regional panel makes the geography concrete. China accelerates from 5.2% to 5.5% (H1 already +5.3%), with lithium-battery output +39% and services electricity (including data centres and EV charging) +8% in H1. India rebounds from a monsoon-dampened 1.6% in 2025 to 7% in 2026 (about 6% in 2027e); H1 ran near 6%, and peak load hit 270.8 GW on 21 May with solar covering 22% of the daytime peak. The United States grows about 1.8% in 2026 after 2.6% in 2025, then 3% in 2027 as data centres and industry rebuild the trajectory after a mild winter. The European Union strengthens to about 2%, with H1 already above 2% on heating, heatwaves, and EV sales >+30% in January–May.

Price-sensitive LNG importers — Bangladesh and Pakistan get named in the IEA news framing — are the exception, not the rule: conservation curtails their consumption while the large economies keep electrifying. That is the theme answer on sourcing demand: the Age of Electricity is not paused by a Hormuz shock; it is taxed unevenly.

Renewables widen the lead — and coal still rebounds

Switch to Fuel outlook and RE / VRE shares. After near parity with coal in 2025 (Ember’s refined 33.8% vs 33.0%), IEA projects renewables generation growth of about 8% in 2026 and 9% in 2027, lifting their share from 33% to 37%. Variable renewables — solar PV plus wind — rise from 17% to 21%. Solar alone adds roughly 610 TWh in 2026 (+23%), matching Ember’s record 2025 add within rounding, and overtakes wind as the second-largest renewable source after hydropower. China still supplies about half of the global solar generation increase; India and other Asian economies rise from ~10% to ~17% of that add.

The uncomfortable companion meter is coal. Global coal-fired generation is expected to rise 1.4% in 2026 after staying roughly flat in 2025. IEA attributes the rebound to higher gas prices amid the Middle East / Hormuz crisis (gas-to-coal switching), weather effects, and rising renewable curtailment in some regions that raised coal-plant utilisation. China accounts for the largest share of the increase after weak wind and higher curtailment in H1; India rebounds from its 2025 coal decline; the EU’s coal decline slows versus the February forecast because gas got expensive. Assuming weather normalises and shipping disruptions ease, IEA expects coal generation to fall slightly in 2027 (less than 1%).

Gas-fired generation stays broadly flat in 2026 — the third year in the past ten without significant annual growth — then rebounds in 2027 if geopolitics allow. Nuclear grows slowly in 2026 (delays and outages) before accelerating above 4% in 2027 as reactors in China and India and delayed projects come online. Power-sector CO₂ rises about 1% in 2026 then plateaus in 2027 as renewables, nuclear, and gas collectively displace coal again.

Wholesale prices reveal who still trades the gas stack

Open Wholesale. The temporary loss of nearly 20% of global LNG supply pushed Asian and European gas prices to their highest levels since the 2022–23 energy crisis. In Q2 2026, average spot wholesale electricity prices in the EU and Japan rose more than 30% year-over-year. The United States was largely unchanged. India rose less than 10% because LNG is a minor power fuel. Australia fell about 45% as renewables and batteries cut peak gas reliance.

That split is the trade-and-security companion to the theme question. Countries that still clear peak power through imported gas import the Hormuz shock into the power bill. Countries that can meet peaks with domestic renewables, nuclear, coal, or batteries decouple. The Q3 post’s LNG investment-doubling story from IEA WEI and the research post’s import-dependence map still matter — India ~86% oil-import dependent, Europe ~75%, China ~73% — but the Mid-Year Update shows the electricity-price channel of that exposure in live Q2 prints.

Flexibility stress is the other side of the renewables win

The Flexibility scatter pairs negative-price hours with wholesale context. South Australia and California spent about 20% of H1 2026 wholesale hours at negative prices — similar to 2025. Spain rose to 17% from 10%. Sweden and Finland fell from ~6% to 2% as flexibility measures improved. During June European heatwaves, midday-to-evening spreads reached about $600/MWh in several markets. Negative prices and extreme spreads are the same system saying two things at once: variable renewables are winning energy hours, and the value of storage, demand response, and flexible thermal is rising in the residual peak.

That is why the Mid-Year Update keeps stressing grids, locational prices, and efficient use of existing networks alongside the renewables-over-coal headline. A 37% renewables share with 21% VRE is not a solved system — it is a flexibility procurement problem.

Who is exposed under the new vintage

More exposed: LNG-linked power systems in Europe and Northeast Asia that just printed >+30% wholesale YoY; coal-fleet owners celebrating a one-year dispatch rebound that IEA already expects to fade in 2027; analysts who treated Ember’s 2025 fossil halt as a permanent trajectory; and price-sensitive emerging importers forced into conservation while China/India/US/EU keep growing load.

Relatively better positioned: solar-plus-storage platforms in markets like Australia where wholesale prices fell 45%; US power markets buffered from the LNG shock; nuclear programs timed to the 2027 acceleration; and grid/flexibility investors capturing $600/MWh-class spreads and negative-price hours.

What would rewrite the next update: a new EI Statistical Review that moves primary fossil share; Ember monthly track showing 2026 coal growth undershooting IEA’s +1.4%; Hormuz shipping fully normalised with gas prices collapsing coal’s relative merit order early; or demand growth slipping back toward 2% if geopolitics cut industrial/data-centre build.

Caveats and methodology

• Primary ≠ electricity. EI TES fossils at 86.2% remain the prior Statistical Review printdo not average them with IEA’s electricity shares.
• 2026–2027 figures are forecasts from IEA Electricity Mid-Year Update 2026; H1 2026 regional meters are disclosed mid-year prints.
• Ember’s 33.8% / 33.0% is a refined 2025 census; IEA’s mid-year text often rounds the 2025 parity to ~33%. Both describe the same crossover year.
• Coal +1.4% is global generation growth, not a share reclaimrenewables still take the #1 slot and widen to 37%.
• Gas “flat” is a global aggregate; regional stories diverge (India gas −15% H1; EU gas +7% H1 before crisis month flips).
• Wholesale YoY figures are Q2 2026 spot averages as summarised by IEAnot full-year realised retail bills.
• Clean investment $2.2T and TES 602 EJ are carried from prior posts; this vintage does not replace WEI or the Statistical Review.
• This post is a vintage delta. For the Ember/WEI Q3 stack use the prior update; for primary-energy flows use the EI update; for import-dependence stock use the research ledger.

The shareable takeaway

Versus our Q3 Ember + IEA WEI update, the newest official electricity print says demand and the renewables lead accelerated while the fossil halt did not survive a security shock. World power demand grows 3.6% then 3.8%, renewables widen from 33% to 37% by 2027 with VRE at 21%, and solar repeats a near-record ~610 TWh add — but coal generation rebounds +1.4% on gas-to-coal switching, gas stays flat, and power CO₂ ticks up ~1% before flattening. Wholesale prices split by LNG exposure: EU/Japan >+30%, US flat, Australia −45%. Fossils remain ~86% of primary TES. The theme answer is sharper: countries are electrifying and greening the power mix while still trading gas-security risk into coal dispatch and power bills.

Related reading: Energy systems Q3 update (Ember/WEI), Energy systems EI update, Energy systems research, and Global electricity generation mix.