About 30 witnesses and as many onlookers showed up in Portland Tuesday night for a chance to testify before regulators about high bills, customer service issues and a requested rate increase by Central Maine Power Co. Only a handful of protesters showed, including two holding a sign calling for CMP to be replaced by a consumer-owned utility company. Most witnesses complained about faulty smart meter readings, escalating electric bills, erratic bills ranging from $300 one month to $800 or $1,100 in other months, long call hold times or no response at all from CMP’s customer service and poor electric service from CMP.