IESET.
Hypotheses·energy·eu_ets_price_2022_2026_carbon_signal_strength

EU Emissions Trading System (ETS) allowance prices traded in a sustained €70-100/tCO2 range from late 2021 through 2024 (with a peak at €105 in February 2023), a step-change above the €5-30 range that prevailed through Phase I-III (2005-2020).

At this price level, classical carbon-pricing theory predicts an acceleration of fuel-switching from coal to gas in power, marginal abatement investment in industry, and measurable extra emissions reductions beyond the pre-2021 trajectory. The hypothesis tests whether ETS-covered-sector emissions in 2022-2024 declined faster than the pre-2021 trend after netting out the 2022 gas shock (which forced coal substitution against the ETS signal in some countries) and the 2023-2024 industrial-output contraction (which reduced emissions for non-pricing reasons). The acceleration test: ETS-sector emissions intensity (tCO2 per unit of activity) declined faster 2021-2024 than 2010-2020 trend.

INCONCLUSIVEengine/runs/eu_ets_price_2022_2026_carbon_signal_strength

INCONCLUSIVE_DATA_PENDING — no outcome variable loaded

confidence cueResult card produced; verdict unclassified.

policy briefCoverage too thin

In ordinary language

In plain terms, this asks whether log eu ets allowance price eur is actually linked to better or worse log eu ets verified emissions from 2010 to 2026.

plain answer

This test cannot make a firm call yet. no outcome variable loaded

why it matters

This matters because energy claims should change belief only when they survive a pre-declared empirical test.

how the test works

It compares 12 country or place units from 2010 to 2026, using a did callaway santanna design, with fixed effects for country and year.

what was measured
What changed
  • Log eu ets allowance price eur
  • Post 2021 step change dummy
What we checked
  • Log eu ets verified emissions
  • Log eu ets emissions intensity industry
  • Log eu ets emissions intensity power
what this does not prove

A single test is not the whole truth. It narrows the claim under a specific sample, time period, and method. Strong policy conclusions need the pattern to survive nearby tests, alternative data, and serious objections.

verification

No evidence packet has been generated yet.

Results

engine/runs/eu_ets_price_2022_2026_carbon_signal_strength
1007550250201020182026DEUFRAITAESPNLDBELPOL
illustrative sketch · run pending
No coefficients yet. When the model fires, this chart will show log_eu_ets_verified_emissions across 12 sampled countries over 2010–2026.
The shapes above are stylised — none of the lines are real data.
Placeholder for eu_ets_price_2022_2026_carbon_signal_strength. Published chart will be generated from engine/runs/eu_ets_price_2022_2026_carbon_signal_strength/chart_data.json.

Pre-registration

registration ordering unverified
first-spec commit 4c8ce8e · 2026-07-18T22:11:21Z
run generated · 2026-04-30T09:47:24Z
Run timestamp predates this path's first git-add commit (rebase, rename, or pre-git local run). Spec hash is still the path's first-add commit — not repository HEAD — but ordering is not a clean pre-registration proof.

EU Emissions Trading System (ETS) allowance prices traded in a sustained €70-100/tCO2 range from late 2021 through 2024 (with a peak at €105 in February 2023), a step-change above the €5-30 range that prevailed through Phase I-III (2005-2020). At this price level, classical carbon-pricing theory predicts an acceleration of fuel-switching from coal to gas in power, marginal abatement investment in industry, and measurable extra emissions reductions beyond the pre-2021 trajectory. The hypothesis tests whether ETS-covered-sector emissions in 2022-2024 declined faster than the pre-2021 trend after netting out the 2022 gas shock (which forced coal substitution against the ETS signal in some countries) and the 2023-2024 industrial-output contraction (which reduced emissions for non-pricing reasons). The acceleration test: ETS-sector emissions intensity (tCO2 per unit of activity) declined faster 2021-2024 than 2010-2020 trend.

Falsification criterion — what would disprove this

set before the run · honoured after

This hypothesis is considered falsified if:

Not supported if (a) β_log_ETS_price on emissions intensity is zero or wrong-signed at p<0.10 after gas-shock + IPI controls, OR (b) post-2021 emissions-intensity trend-break is not faster than pre-2021 trend at p<0.10, OR (c) industry abatement capex announcements show no positive elasticity to ETS price (capex responds with multi-year lag, but no response by 2024 would refute the investment-channel mechanism), OR (d) the headline emissions decline is fully explained by gas-shock + output contraction (suggesting the ETS price signal is doing nothing on top).

formal test & threshold
test:      ets_price_signal_emissions_intensity_panel
threshold: β_log_ETS_price < -0.10 at p<0.10 on power emissions intensity AND β_log_ETS_price < -0.05 at p<0.10 on industry emissions intensity AND Post-2021 intensity decline > 1.5x pre-2010-2020 trend AND Industry abatement-capex elasticity to ETS price > 0 at p<0.10.

Method

Template
did_callaway_santanna
Fixed effects
country, year
Clustering
country
Sample
12 countries · 2010 – 2026
Evidence type
causal

Primary specification: panel regression of log emissions intensity (industry + power separately) on log ETS price + controls (TTF, oil, IPI, HDD), with country + year FE. Identification: ETS-price variation post-2021 step-change. Test: β on log_ETS_price < 0 at p<0.10 on emissions intensity, after partialling out gas-shock + industrial-output channels. Secondary: pre-2021 vs post-2021 trend-break test on emissions intensity. Did the slope flatten further (faster declines) after the price step-change? Decompose into power vs industry — power- sector intensity drop is dominated by coal-to-gas-to-renewables fuel-switching; industry drop requires actual abatement-capex response, which is slower. Tertiary: industry abatement-capex announcements regression on ETS price — does the price signal predict announced decarbonisation investment cumulating with a 2-3 year lag? Known limitations: (1) 2022-2023 ETS-covered emissions fell partly because of gas-shock induced industrial-output contraction (energy-intensive plant idling). Separating "less output → less emissions" from "same output but more abatement" requires output-normalised intensity metric, which is the primary outcome here. But the intensity metric is noisy at country-sector level. (2) Phase 4 (2021-2030) tightened cap + linear reduction factor + MSR holds back excess allowances; price is endogenous to all three. Treatment is bundled. (3) ETS2 (separate system for buildings + road transport) launches 2027; v1 scope ends 2026 to keep ETS1 isolated. (4) Free allocation phase-out for CBAM-covered sectors begins 2026, introducing time-varying effective price faced by EU producers.

Data

VariableSourceTransform
log_eu_ets_verified_emissions
outcome
eea:eu_ets_verified_emissionstier 2
log
log_eu_ets_emissions_intensity_industry
outcome
constructed:ETS verified emissions in industrial subsectors (steel, cement, chemicals, refining) ÷ subsector value added (Eurostat stier 5
log
log_eu_ets_emissions_intensity_power
outcome
constructed:ETS verified emissions in power sector ÷ generation (TWh, ENTSO-E). Captures coal-to-gas-to-renewables intensity shift.tier 5
log
log_eu_coal_generation_share
outcome
constructed:ENTSO-E aggregated thermal generation by fuel — coal/lignite share of total generation. entsoe fetcher pending; Eurostattier 5
log
log_eu_industry_abatement_capex
outcome
constructed:BloombergNEF / IEA decarbonisation tracker — EU heavy-industry decarbonisation announcements (hydrogen, electrification,tier 5
log
log_eu_ets_allowance_price_eur
treatment
constructed:EEX EUA spot price index, monthly average. eex fetcher pending; manual-drop fallback under data/manual/derived/.tier 5
log
post_2021_step_change_dummy
treatment
constructed:indicator = 1 from 2021-Q1 onwards (when ETS price first sustained above €40 + Fit-for-55 announcement).tier 5
indicator
log_natural_gas_ttf
control
constructed:TTF EUR/MWh, monthly. eex fetcher pending or manual-drop.tier 5
log
log_brent_oil
control
imf_pcps:POILBREtier 1
log
log_real_gdp_eu
control
world_bank_wdi:NY.GDP.MKTP.KDtier 2
log
log_industrial_production_index_eu
control
oecd:STSIND4_PRODMANtier 2
log
heating_degree_days_eu
control
eurostat:nrg_chdd_mtier 1
level

● ready  · ● pending  · ● reconstruct-needed

Detailed result card

Result card — eu_ets_price_2022_2026_carbon_signal_strength

Verdict: INCONCLUSIVE_DATA_PENDING — no outcome variable loaded

Pre-registration

  • Claim: EU Emissions Trading System (ETS) allowance prices traded in a sustained €70-100/tCO2 range from late 2021 through 2024 (with a peak at €105 in February 2023), a step-change above the €5-30 range that prevailed through Phase I-III (2005-2020). At this price level, classical carbon-pricing theory predicts an acceleration of fuel-switching from coal to gas in power, marginal abatement investment in industry, and measurable extra emissions reductions beyond the pre-2021 trajectory. The hypothesis tests whether ETS-covered-sector emissions in 2022-2024 declined faster than the pre-2021 trend after netting out the 2022 gas shock (which forced coal substitution against the ETS signal in some countries) and the 2023-2024 industrial-output contraction (which reduced emissions for non-pricing reasons). The acceleration test: ETS-sector emissions intensity (tCO2 per unit of activity) declined faster 2021-2024 than 2010-2020 trend.
  • Falsification rule: Not supported if (a) β_log_ETS_price on emissions intensity is zero or wrong-signed at p<0.10 after gas-shock + IPI controls, OR (b) post-2021 emissions-intensity trend-break is not faster than pre-2021 trend at p<0.10, OR (c) industry abatement capex announcements show no positive elasticity to ETS price (capex responds with multi-year lag, but no response by 2024 would refute the investment-channel mechanism), OR (d) the headline emissions decline is fully explained by gas-shock + output contraction (suggesting the ETS price signal is doing nothing on top).

Estimate (Callaway-Sant'Anna staggered DiD, TWFE approximation)

  • Error: no outcome variable loaded

Variables resolved

Missing data

  • eea:eu_ets_verified_emissions (outcome)
  • constructed: ETS verified emissions in industrial subsectors (steel, cement, chemicals, refining) ÷ subsector value added (Eurostat sbs_na_ind_r2 or OECD STAN). Decomposes scale from intensity. (outcome)
  • constructed: ETS verified emissions in power sector ÷ generation (TWh, ENTSO-E). Captures coal-to-gas-to-renewables intensity shift. (outcome)
  • constructed: ENTSO-E aggregated thermal generation by fuel — coal/lignite share of total generation. entsoe fetcher pending; Eurostat nrg_cb_em fallback. (outcome)
  • constructed: BloombergNEF / IEA decarbonisation tracker — EU heavy-industry decarbonisation announcements (hydrogen, electrification, CCS). Manual-drop pending under data/manual/derived/. (outcome)
  • constructed: EEX EUA spot price index, monthly average. eex fetcher pending; manual-drop fallback under data/manual/derived/. (treatment)
  • constructed: indicator = 1 from 2021-Q1 onwards (when ETS price first sustained above €40 + Fit-for-55 announcement). (treatment)
  • constructed: TTF EUR/MWh, monthly. eex fetcher pending or manual-drop. (controls)
  • imf_pcps:POILBRE (controls)
  • world_bank_wdi:NY.GDP.MKTP.KD (controls)
  • oecd:STSIND4_PRODMAN (controls)
  • eurostat:nrg_chdd_m (controls)

Generated by scripts/run_did_callaway_santanna.py at 2026-04-30T09:47:24+00:00

Strongest opposing argument

Every hypothesis ships with its charitable opposing argument. The framework earns credibility by handling objections at their strongest, not weakest.

Notes

Data readiness: - EEA EU ETS verified emissions: ready (eea fetcher) - Eurostat sbs_na_ind_r2 + nrg_chdd_m: ready - OECD industrial production: ready - WDI / IMF PCPS: ready - ENTSO-E generation mix: entsoe fetcher pending; Eurostat nrg_cb_em fallback - EEX EUA spot price: eex fetcher pending or manual-drop under data/manual/derived/ - TTF gas: eex fetcher pending or manual-drop - BNEF / IEA decarbonisation announcements tracker: manual-drop pending Run when EEX (EUA + TTF) manual-drop is populated; emissions intensity test can run on existing eea + Eurostat + WDI as v0.5.

Authored framework. Read the transparency note.