School superintendents, retirees and others gave the Indiana Utility Regulatory Commission an earful Tuesday night on NIPSCO’s proposed 20% rate increase, which would drive up residential customers’ monthly bills by around $45 per month. For about 90 minutes, the IURC heard testimony about struggling to pay electric bills during the field hearing at Ivy Tech Community College in Valparaiso. Additional field hearings will be held on Dec.