In May 2013, EECA Business, in collaboration with the New Zealand Green Building Council (NZGBC), launched a new scheme to measure and rate the energy performance of commercial buildings in New Zealand. The New Zealand scheme, NABERSNZ™, is based on the successful National Australian Built Environment Rating System (NABERS) and has been adapted for New Zealand conditions. NABERSNZ™ is a voluntary scheme that aims to assist owners and tenants to reduce energy use and costs, and reduce greenhouse emissions. Under NABERSNZ™ qualified assessors measure and score the energy performance of office buildings, giving tenants and owners a star rating out of 6. Ratings can be achieved for a whole building, base building, or tenancy. The scheme is licensed to EECA and is administered by the New Zealand Green Building Council (NZGBC). Ratings are carried out by trained assessors.