In an invented procurement program, 11 cities combine orders for 320,000 cubic meters of concrete used in routine public works. Bidders must disclose production emissions under a common accounting method, including transport boundaries and the treatment of supplementary materials. The demonstration tender assigns 20% of its evaluation score to verified carbon intensity, while retaining separate requirements for structural performance and delivery reliability.

A modeled budget allows a price premium of up to 6%, but payment depends on documentation for delivered batches rather than a supplier's corporate average. This distinction matters because emissions can vary between plants and recipes. The alliance would also publish unsuccessful bids in anonymized form, helping buyers determine whether competition is improving or whether restrictive specifications are simply shrinking the pool of eligible suppliers.