One US Gulf coast refining margin indicator rose to its highest level in at least four and a half years, supported by Hurricane Harvey and its aftermath in the US.
Surging regional gasoline prices lifted the 3-2-1 LLS crack spread by $2.334/bl to $30.514/bl.
The 3-2-1 West Texas Intermediate (WTI) crack spread in the US midcontinent increased by $11.47/bl to $29.64/bl as RBOB and ULSD cash prices jumped from last week after Hurricane Harvey severely disrupted US Gulf coast refining capacity. The 3-2-1 West Canadian Select (WCS) crack spread in Chicago also increased, firming by $11.32/bl from last week to $41.54/bl.
The 3-2-1 Brent crack spread in the US Atlantic coast reached its highest margin in more than a year, at $33.44/bl on 31 August. The spread nearly doubled in value over the last week. It closed at $17.39/bl on 24 August.
The west coast crack spread, calculated using Alaskan North Slope crude prices based on a 5-3-1-1 yield, also rose sharply over the week. The spread rose to $23.99/bl on 31 August, gaining $7/bl over the week and hitting its highest level this year.
Spreads were helped by stronger prompt gasoline prices, which rose by 26¢/USG over the week to close at $2.03/USG. Sharp gains in the underlying Nymex RBOB basis on reduced US refining capacity in Hurricane Harvey's aftermath have pulled up Los Angeles gasoline prices.

