Carbon Allowances

Most commodities are dug up or grown. A carbon allowance is created by legislation: one EUA — European Union Allowance — is the legal right to emit one tonne of CO₂. Power plants and factories covered by the EU's Emissions Trading System must hand in one allowance per tonne emitted each year, or face a €100+ penalty and still owe the allowance.

The trick is the cap: the EU issues a fixed number of allowances each year and shrinks that number annually. Emitters who cut emissions cheaply can sell spare allowances; those who can't must buy. The price that emerges is the market's answer to a question no committee could answer: what does avoiding one tonne of CO₂ actually cost? From under €5 in the oversupplied 2010s, EUAs rose past €100 in 2023 as the cap tightened.

One distinction spares much confusion: compliance allowances (EU ETS, UK ETS, California) are scarce by law and trade in liquid, regulated markets. Voluntary carbon credits (forestry offsets and the like) are certified project claims of avoided emissions — a separate, murkier world where quality scandals are routine. This page is about the first kind.

How the market actually trades

Liquidity lives in the December futures on ICE Endex — the front-Dec contract is the market's benchmark, turning over multiples of spot. Primary supply arrives via near-daily auctions (EEX); utilities buy years ahead to hedge power they have already sold forward. An allowance costs nothing to store (it's a registry entry) and pays no yield, so futures price as a pure financing carry:

— no storage cost, no convenience yield, none of the backwardation drama of physical commodities. Persistent deviations from this contango are arbitraged by banks holding allowances against short futures ("cash-and-carry"), making EUAs behave more like a financial asset than like oil.

What moves the price

• Fuel switching — the classic short-run driver: the carbon price at which burning gas becomes cheaper than coal for power. When gas is cheap, a modest EUA price flips the dispatch order; the implied "switching band" long anchored the market.
• The cap trajectory: −4.3%/year under "Fit for 55", plus one-off cap cuts — supply policy is the fundamental.
• The MSR (Market Stability Reserve): an automatic valve that withholds allowances from auctions when the surplus in circulation exceeds a threshold and cancels part of the reserve — a central-bank-like rule that made the post-2018 bull market possible by ensuring hoarded surplus doesn't return.
• Politics, both ways: energy-crisis interventions, Brexit (UK left the EU ETS), and periodic proposals to raid the reserve keep a policy risk premium in the curve.

Pricing theory: an exhaustible resource by decree

In the textbook model (Hotelling applied to a fixed emissions budget), the allowance price should rise at the interest rate until the cap binds terminally — banking makes allowances an asset, and the marginal abatement cost curve pins the terminal level:

Reality deviates instructively: the MSR truncates the surplus dynamics (state-dependent supply), compliance deadlines create seasonal demand, and hedging flows from utilities' forward power sales dominate the front of the curve. Empirically EUAs carry equity-like volatility (30–60% annualised) with low correlation to other asset classes — which is exactly why funds arrived.

The financialisation debate

Investment funds' net length is published weekly (ESMA/COT-style reports); politicians blame speculators in every rally. The sober evidence: financial players mostly supply the other side of utility hedging and the cash-and-carry basis, and price spikes track fundamentals (gas, weather, cap news). But position data move the market now — a reflexivity the ETS never had when only compliance desks traded it.

The frontier: CBAM and linkage

• CBAM — the EU's carbon border adjustment — phases in from 2026: importers of steel, cement, aluminium, fertiliser must buy certificates priced off EUA auctions, extending the ETS price beyond EU borders and (by design) exporting carbon pricing pressure to trading partners.
• ETS2 brings buildings and road transport under a parallel cap from 2027 — a second, politically explosive carbon price with its own soft price collar near €45.
• Linkage and fragmentation: Switzerland is linked; the UK ETS floats separately (usually at a discount, creating a visible policy-risk spread); California–Québec runs its own linked system with price floors. "The carbon price" is actually a family of jurisdictional prices, and their spreads price politics directly.

The formulas above are standard textbook formulations, simplified for teaching. They explain the mechanism — they are not a valuation tool, and they will not reproduce a dealer’s price.