OPEC Trims 2026 Demand Growth to 970,000 Barrels Per Day in Second Straight Monthly Cut, Raises 2027 Forecast

OPEC cut its 2026 global oil demand growth forecast for the second consecutive month, trimming the projection to 970,000 barrels per day from 1.17 million barrels per day in the prior report. The downgrade reflects a 60,000-barrel-per-day cut to Indian demand growth and a projected 40,000-barrel-per-day decline in Middle East consumption tied to the ongoing Iran conflict. OPEC simultaneously raised its 2027 demand growth forecast to 1.73 million barrels per day from 1.54 million, signaling the organization views the 2026 shortfall as war-driven and temporary.

Middle East oil demand in March 2026 ran 500,000 barrels per day below year-ago levels, a direct consequence of the conflict that disrupted economic activity across the region. OPEC+ crude output also declined, falling 185,000 barrels per day month-over-month to 33.13 million barrels per day in May, per Argus Media's coverage of the June OPEC Monthly Oil Market Report. Non-OPEC+ supply growth held flat at 630,000 barrels per day for 2026, unchanged from the prior estimate.

Three Agencies, Three Post-War Trajectories

The EIA's June 2026 Short-Term Energy Outlook, published June 9, shows a market balance that diverges sharply from OPEC's outlook. Global consumption is forecast at 102.9 million barrels per day against production of 99.0 million barrels per day, a 3.9-million-barrel-per-day deficit driven by Hormuz-related production shut-ins of 11.3 million barrels per day in May. That supply deficit, not OPEC production discipline, is the primary support for current prices.

The post-Hormuz picture diverges across agencies. The EIA forecasts Brent crude averaging $79 per barrel in 2027 as Iranian and Gulf production gradually returns to market. The IEA estimated 2026 demand growth at 930,000 barrels per day, close to OPEC's revised figure, but before the war the agency had flagged a potential surplus of 3.7 million barrels per day once OPEC+ unwound its voluntary production cuts. OPEC's 2027 demand upgrade to 1.73 million barrels per day implicitly bets that cartel discipline will prevent that surplus from materializing.

The 760,000-Barrel Demand Acceleration OPEC Is Counting On

OPEC's revised forecasts imply demand growth accelerates by 760,000 barrels per day between 2026 and 2027, climbing from 970,000 barrels per day to 1.73 million. China and India account for most of that projected uptick, per the Argus report on the OPEC MOMR. That acceleration would need to absorb most of the supply that returns when Hormuz reopens, or prices will fall further than OPEC's optimistic 2027 demand view implies.

The supply numbers point the other direction. The EIA documented production shut-ins of 11.3 million barrels per day in May 2026. When those barrels return to market, even a strong demand rebound would face significant surplus pressure unless OPEC+ deepens cuts to offset returning Iranian and associated volumes. OPEC+ May output of 33.13 million barrels per day already sits well below pre-war capacity, suggesting some additional discipline is already in place.

What the Agency Disagreement Means for Western Canadian Select

WTI crude traded at $84.88 per barrel on June 12 on the CME, per Trading Economics. Western Canadian Select carries a $12 per barrel discount to WTI, per CAPP's April 2026 differential analysis, placing estimated WCS near $72 to $73 per barrel. That is well above the $60 to $62 range WCS commanded before the Iran conflict began in early March, when WTI traded near $74 to $75.

If the EIA's 2027 Brent forecast of $79 per barrel proves accurate, WTI would settle near $76 and WCS near $64 per barrel under the $12 discount. If OPEC's demand optimism is correct and post-war prices stabilize near current levels, WCS would remain above $70. Alberta producers running WCS-linked royalty calculations face a potential $8 to $10 per barrel swing in realized prices depending on which agency's post-war trajectory proves correct.

Before the Iran conflict began, the IEA had warned of a potential 3.7-million-barrel-per-day global surplus as OPEC+ unwound extra voluntary cuts. The war reversed that surplus into a 3.9 mb/d deficit almost overnight. OPEC's confidence in the 2027 demand rebound reflects its view that cartel cuts will prevent the pre-war surplus scenario from reasserting itself when Hormuz reopens.