SUMMARY
European LPG diverged by grade in August: butane rose 2.8% MoM to $595.75/MT while propane slipped 2.3% to $528.43/MT, both surging late in the month as an escalating Iran-US conflict lifted the broader energy complex. Propane's forward curve bull-steepened, flipping from contango (-$6.50 M1-M2) to backwardation (+$7.50) as M1 gained $67.75/MT against M12's $20.00, while butane's curve compressed toward flat (M1-M2 fell to +$1.00) as the back end outpaced the front, a structurally different signal: acute near-term propane scarcity versus sustained but less front-loaded butane tightness. NWE also lost ground regionally, with the NWE-Middle East spread flipping from a +$38.15/MT premium to a -$44.86/MT discount as Gulf and Asian hubs repriced faster. Elevated US LPG imports into NWE (an eight-month high near 591,000t in July, per Kpler) plus new propane-consuming capacity widened the propane-butane discount to -$90.50 by month-end from June's -$36.56 average. Naphtha eased from July's $868.50 peak to close at $760.75, letting butane's naphtha discount tighten to -$96.50, the narrowest in six months.
PRICE ACTION

CROSS-MARKET DYNAMICS
- Naphtha (GX0000092) averaged $746.01/MT (+8.8% vs June), easing from July's $868.50 peak to close at $760.75/MT
- Butane-naphtha spread (GX0011232) narrowed from -$164.39/MT average in July to -$150.26/MT, closing at -$96.50/MT, the tightest in six months
- Propane-naphtha spread (GX0000736) widened on average (-$217.59 vs -$203.51) but closed narrower (-$187.00 vs -$280.75 in July)
- Propane's physical-vs-swap premium (GX0000737) averaged just +$0.93/MT, down from +$5.66 in July and +$15.99 in June; it dipped to -$15.00 (12-17 Aug) before rebuilding to +$12.75 as the late-month risk premium rebuilt
CROSS-REGIONAL DYNAMICS
- NWE-Far East spread widened to -$212.25/MT average from -$150.42/MT in July; Far East propane averaged $745.51/MT (+7.9% MoM) against NWE's -2.3%
- NWE-Middle East spread flipped from a +$38.15/MT NWE premium in July to a -$44.86/MT Middle East premium, an $83.01/MT swing; Middle East CP averaged $576.00/MT (+14.6% MoM), the fastest-moving hub
- The narrowest NWE-Far East gap of the month (-$181.00 on 18-Aug) coincided with NWE's sharpest single-day rally, showing NWE catching up intraday despite lagging on average
- Mechanism: Far East and Middle East pricing outran NWE on Asian demand pull and Aramco CP-linked revisions; the widening arb should, in principle, incentivize US-origin barrels to divert toward Asia and the Gulf if it persists
CURVE STRUCTURE
Propane

- Bull steepening: M1 gained $67.75/MT (+13.7%) vs M12's $20.00 (+4.5%), a 3.4x front-to-back ratio; the curve flipped from slight contango to full backwardation
Butane

- Compression: M1-M2 collapsed to near-zero from $9.75; M1-M12 narrowed 27% even as the curve rallied, with M12 gaining more than M1 ($84.75/MT vs $58.00/MT)
PRICE VOLATILITY

- Naphtha's low August CV masks that most of its volatility (the $868.50 peak) occurred in July, not August
- Propane and butane sit mid-range, well below the March-April distress period, but the monthly figure smooths over the sharp W3 acceleration in the weekly data
- Risk models calibrated to trailing CV may be under-pricing the intra-month regime shift confirmed by the curve moves and single-day price changes
SOMETHING TO WATCH
- Propane M1-M2 spread as the curve-pattern signal:
- Observation: closed August at +$7.50, up from -$6.50 at the start
- Why it matters: further widening confirms bull steepening is intact; a reversal to contango signals the risk premium unwinding
- What to monitor: weekly M1-M2 close; developments in the Iran-US conflict
- NWE-Middle East spread as the regional arb signal:
- Observation: closed at -$38.25, down from a +$140.00 NWE premium in early July
- Why it matters: a sustained Middle East premium pulls US-origin cargoes toward the Gulf and Asia, tightening European supply further
- What to monitor: weekly NWE-ME and NWE-FE spread closes; the Aramco September CP settlement
- Propane-butane discount as the feedstock-substitution signal:
- Observation: closed at -$90.50, near the two-month wide of -$106.00
- Why it matters: a break below -$106.00 confirms propane length is structural; a narrowing toward June's -$36.56 average signals it's been absorbed
- What to monitor: weekly propane-butane close; Kpler September import data; utilization at the restarted Netherlands and Sines units
Note: All figures, prices and market activity referenced in this report are based on the period covered by this monthly update.

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