They serve two purposes:
1. Purchasers and renters of buildings will be able to compare the energy performance of different buildings before signing. While Energy Performance Regulations require minimum standards, performance ratings will identify buildings that go beyond this to achieve higher specification.
2. Building and energy managers will be able to compare their building's energy performance with other buildings and identify possible improvements (these could include better operational practices or modifications to the fabric or services)
Author: Roger HITCHIN (BRE)