Most of the Springfield and Greene County government complex north of downtown lost power for roughly 30 minutes on Monday. City Utilities spokesman Joel Alexander said around 9:55 a.m., employees were working on some equipment at a substation behind the post office along Chestnut Expressway, which caused an outage. "We're not sure what happened at this point," Alexander said, "But we'll be doing some checking and some tests to figure out what caused it." Buildings affected included CU offices, the Office of Emergency Management building, the courthouse, city hall and jail. Many of those buildings have backup generators, and Alexander said as far as he knew, everybody was able to access that backup supply.