In cooperation with the Waterville Opera House Improvement Association, the City co-sponsored an energy audit of City Hall and the Waterville Opera House in 2015. Each space was independently reviewed and improvements were presented to both the Opera House and the City. The Opera House utilized the energy saving options presented in the audit to secure a 50:50 matching fund, energy efficiency grant.

The Opera House and the City coordinated this work into 2016. Some of the exclusive City efficiency improvements implemented included: swapping out dated light fixtures with LED fixtures, and insulating all of the exterior walls exposed in the basement renovation project.