A procurement team locks a diesel standby spec in Q1, sizes the fuel yard, and files the air permit. Then the Illinois application date slips past December 1, 2026, the Tier 2 sets they priced are no longer permittable, and the whole package goes back to bid, months lost, and the commissioning date now at risk. This is the 2026 trap, and it is a procurement problem before it is an engineering ...