An underground transformer is on fire this morning in Sioux Falls.  Some streets are closed around 9th & Philllips downtown.  Xcel energy and rescue units are working on the scene.  There are reports of a manhole cover being blown out of it's hole.  Smoke and flames were visibly coming out of the manhole.  At this time smoke is still billowing out of the manhole.  A two block square area is barricaded off around 9th and Phillps and no traffic is being allowed through.   A number of businesses in the downtown area are reporting no lights or heat.  Check out the Xcel Energy outing map.  We will keep you updated as more info becomes available.