In cooperation with the City of Seattle and Seattle City Light, Built
Green, a residential green building certification program of the
Master Builders Association of King and Snohomish Counties,
conducted research to determine how much electricity is saved
by single-family homes and townhomes that are certified Built
Green compared to non-certified homes.

This study determined the actual electricity savings of Built Green
homes by examining how much electricity the homes used after
being occupied for a at least one year. Built Green obtained
electricity data for all single-family homes and townhomes that
had been built in Seattle in the year 2014. 746 homes were
examined in the final evaluation, making the study, to our
knowledge, one of the largest of its kind.

Follow the provided link to read the complete Built Green Abridged Report