The Sacramento Municipal Utility District saw its operating revenue drop in 2010, but the loss was partially offset by lower power purchase costs, according to the muni's 2010 financial audit. According to district data, sales to customers and other revenues were $56.4 million lower than budgeted during the 12-month period. Actual revenue for the calendar year was $1.19 billion, down from $1.29 billion in 2009. "That's mainly due to lower customer usage," district controller Cary Nethaway said March 3. "Our customers used almost five percent less energy than we planned for last year." Despite the lower than planned revenues, the utility saw an increase in its financial assets during the year, he said. The consolidated results for 2010 resulted in an increase in net assets of $30.8 million, as opposed to a budgeted increase of $7.8 million, Nethaway said. At about $116 million, the utility's net purchased power costs were about $34.8 million lower than planned. The muni also had fewer customers than the year prior, plus a higher number of uncollectable accounts, both of which were partially offset by higher average rates during the year, Nethaway said. SMUD rates rose 5.5 percent in March 2010.