Why are the residental rates lower in Ipswich? Partly because of how power contracts have been negotiated. The Ipswich Light Department secured favorable terms with many of it's suppliers. Also, the Light Department is a not-for-profit operation, unlike private companies earning profits for shareholders. Ipswich Light Department's primary objective is to meet the needs of the community! Just one more benefit of living in Ipswich! Click here for electric rate comparison charts.