Why is Century Aluminum so sensitive to electricity costs?

Aluminum smelting is one of the most power-intensive industrial processes on earth, consuming 14,000–16,000 kWh per metric ton of aluminum produced. For CENX, electricity is not a secondary input — it is the primary cost driver at all three of its U.S. smelting facilities. With a gross margin of only 9.8%, even modest energy cost overruns relative to aluminum revenue gains compress margins to near zero.

What is the specific earnings miss record for CENX?

CENX missed EPS estimates in each of the last four reported quarters. The three most recent periods with disclosed data showed misses of 39% ($0.36 actual vs. $0.59 estimate), 9.1% ($0.30 actual vs. $0.33 estimate), and 33.3% ($0.56 actual vs. $0.84 estimate), producing an average shortfall of roughly 21% across the streak.

How does the Iran conflict affect CENX both positively and negatively?

On the positive side, Iranian strikes on Gulf aluminum smelters reduce global primary aluminum supply, pushing LME prices higher — which benefits CENX as a domestic producer. On the negative side, the same conflict drives broader energy market volatility, spiking electricity costs that represent CENX's single largest operating expense. The bull case prices in the LME benefit while treating the energy cost impact as negligible.

What would need to happen for the $66 consensus price target to prove correct?

LME aluminum prices would need to rise materially and sustain above current levels, while CENX's power purchase agreements at Hawesville, Sebree, and Mt. Holly insulate electricity costs sufficiently that the net LME-to-cost spread widens. In that scenario, CENX's 6.4x forward P/E would look inexpensive relative to the earnings uplift. The company has not demonstrated this capability across four recent quarters under varied commodity conditions.

What is CENX's current free cash flow situation?

TTM FCF is $47mn on $2.5bn in revenue, producing a 1.9% FCF margin. This leaves no meaningful buffer against cost overruns. A 200 basis point compression in gross margin — achievable in an energy spike scenario — would eliminate approximately $50mn in gross profit, which is roughly equivalent to the entire current FCF base.

CENXMarch 31, 2026

By Basis Report Editorial · Updated April 1, 2026

Century Aluminum's 9.8% Gross Margin Cracks Under Iran Energy Cost Shock

NEW YORK, March 31 —

Century Aluminum (CENX) has missed EPS estimates in each of the last four quarters. The shortfalls averaged 21% below consensus across the three most recent periods — 39%, 33%, and 9%. Each time, analysts lifted their numbers and placed the same earnings-leverage bet on the next aluminum cycle. Then Iran attacked Gulf aluminum facilities. CENX shares jumped to $59.30. Bullish upgrades followed. The logic: smelter outages tighten global primary supply, LME aluminum prices climb, and Century pockets the difference. But the same conflict pushing aluminum prices up is also pushing electricity prices up. Aluminum smelting burns 14,000–16,000 kWh per metric ton. CENX runs a 9.8% gross margin on $2.5bn in revenue and generates $47mn in free cash flow — a 1.9% FCF margin. Even a small electricity cost increase wipes that margin out. This is the same risk that blew up four straight quarters of consensus estimates. Now it has a direct catalyst behind it.

What the Street Believes

Consensus holds a $66 price target on CENX, implying an 11.3% gain from current levels. The logic: Iranian strikes on Gulf aluminum facilities cut global primary supply, LME aluminum prices rally, and Century — running smelters at Hawesville and Sebree in Kentucky and Mt. Holly in South Carolina — captures that price gain at a 6.4x forward multiple. Analysts are modeling one side of this trade. The income statement shows both. A sustained Gulf supply disruption does tighten global primary aluminum supply. But CENX is not a pure play on that disruption. Century's electricity costs are exposed to the same geopolitical shock driving the commodity price. At a 9.8% gross margin on $2.5bn in revenue, there is no slack to absorb rising power costs before the earnings model flips. It has flipped four consecutive times — and that was before a conflict of this scale hit energy markets.

What the Data Shows

Analysts model $66 on rising LME prices. The last four quarters tell a different story. CENX missed EPS estimates by an average of 21% across periods of varied aluminum prices. Higher electricity costs ate the gains from higher aluminum prices before they hit the bottom line. Most recently, CENX posted $0.36 actual against a $0.59 estimate — a 39% miss. Two quarters prior: $0.56 actual versus $0.84 estimate, a 33% miss. These are not rounding errors. The spread between aluminum revenue and energy input costs is not widening the way the model demands.

"Iran's attacks on Gulf aluminum plants threaten supply crisis — while separately, stocks pressured by economic fallout from Iran war, with energy costs spiking alongside the aluminum rally."

The current bull case ignores that signal. The same conflict pushing LME aluminum prices higher is driving the electricity cost increases that already erased four straight quarters of consensus estimates — before this catalyst arrived. Aluminum smelting requires 14,000 to 16,000 kWh per metric ton. Electricity is not a line item in CENX's income statement. It is the income statement. Power purchase agreements at Hawesville and Sebree provide partial insulation, but hedged volumes have limits. Electricity costs beyond those contracts hit gross profit directly. At $47mn in FCF on $2.5bn in revenue, CENX has no buffer. A 200 bps compression in gross margin — plausible if electricity costs rise faster than LME prices — erases roughly $50mn in gross profit. That is the entire FCF base. Gone.

Why This Changes the Calculus

The bull case on CENX has always required one condition: aluminum prices rising while energy costs hold steady