In an invented municipal procurement scheme, the city of Tervane compares annual renewable purchasing with hourly matching. Its illustrative portfolio buys renewable generation equal to 100% of yearly demand, yet matches consumption within the same hour only 61% of the time. The distinction matters because a yearly balance does not describe which generators supply the network during each operating period.

Raising the modelled hourly match to 84% requires a different mix of contracts, flexible demand and storage, increasing annual procurement costs by $9 million. That result is specific to the assumed grid and load profile, not a universal price estimate. The policy question is whether the additional expenditure produces enough system benefit to justify a stricter accounting standard and its associated verification burden.