Summary: Revises Tariff WN U-3, Rule 17, Firm Service Priority, and Rule 20, Unbundled Distribution System Transportation Service Rules. Natural gas customers who purchase their own gas from a third-party must pay pipeline overrun and underrun charges and meet monthly imbalance thresholds. This revision reflects changes approved by the Federal Energy Regulatory Commission for such charges by Northwest Pipeline and passes those charges on to transportation customers of Cascade Natural Gas Company. Revised sheets are 21-A, 21-B, 24, 24-A, and 24-B.
