Gas Retail Rate Design. In a move toward equalizing rates of return between customer classes, the Oregon PUC authorized Northwest Natural Gas Co. to increase base rates by nearly $246,000, at the same time boosting residential rates by 1.3 percent but lowering rates for large commercial and industrial users. It set return on equity at 10.25 percent, finding the rate "consistent with the downward trend of ROEs authorized by other regulatory commissions." Order No. 99-697, Nov. 12, 1999 (Ore.P.U.C.).