News Photo by Julie Riddle In icy rain, an Alpena Power Company worker makes adjustments on a power pole near the Alpena County Courthouse on Wednesday morning.

ALPENA – The Alpena County Courthouse shifted to generator power when an underground feed failed on Wednesday morning.

Alpena Power Company officials did not know what caused the failure, a representative said.

The failure impacted only the courthouse, where employees were told a repair might take several hours.

The courthouse remained open but had limited capacity to serve residents, as the reduced power source left some computers inoperable while others flickered in and out, according to an Alpena County Clerk’s Office representative.