The ineptness and disregard for common-sense utility regulation in Texas makes my blood boil and keeps me up at night,” Katie Sieben, chairwoman of the Minnesota Public Utility Commission, said in an interview. “It is maddening and outrageous and completely inexcusable that Texas’s lack of sound utility regulation is having this impact on the rest of the country.” . . .

Gas prices in Minnesota rose to 70 times their normal level, as deliveries to the state’s main trading hub dropped by 39 percent. . . .

Minnesota’s biggest gas companies are putting forward plans to recoup their expenses by adding a surcharge to customers’ bills, which the state utility commission would first have to approve. Normally, such adjustments to account for winter prices go into effect in September, but Minnesota’s biggest gas utility, Houston-based CenterPoint Energy, says the financial pinch is so great it wants to start billing customers next month — and charging them nearly 9 percent interest until the extraordinary costs are paid off. . . .

Minnesota’s second-largest gas company, Xcel Energy, also wants to spread the recovery of costs over two years — but said it would not charge interest, which it said would amount to $24.7 million on borrowing to cover its expenses. The company, based in Minneapolis, predicted a charge of about $250 per residential customer. Minnesota Energy Resources said it would hope to recover about $225 per customer. The smallest commercial utility, Greater Minnesota Gas, said it had enough of a supply in storage in February and was able to avoid the spot market.