We expect a modest weakening to Questar Gas Co.'s stand-alone financial measures reflecting the recently revised U.S. corporate tax code, reflecting a reduction to the utility's revenue requirement. We are affirming our 'BBB+' long-term corporate credit and senior unsecured debt ratings on Questar Gas Co. (QGC). The outlook remains negative. We are revising Questar Gas' stand-alone credit profile (SACP) to 'a-' from 'a'. The negative outlook continues to reflect parent Dominion Energy Inc.'s consolidated weak financial measures for the current rating and our expectation that the financial measures will remain at or below the downgrade threshold over the forecast period. On Feb. 26, 2018, S&P Global Ratings affirmed its 'BBB+' long-term issuer credit rating and senior unsecured debt ratings on
