The levels of energy efficiency auditing (simplified from ISO 50002)

Some of the most commonly-used energy use metrics are explained in the table below.

Level I Audit Report Level II Audit Report Level III Audit Report
  • Executive Summary
  • Brief facilities description
  • Scope of audit/Methodology
  • Preliminary Analysis Findings, including benchmark and end use results
  • List of no-cost and low-cost energy measures
  • Potential measures for further consideration
  • All items from Level I Audit
  • More comprehensive energy end use analysis
  • Description of building systems and major equipment
  • Financial analysis of EEMs
  • Description of energy efficiency measures considered and not recommended or not financially viable
  • Description of energy efficiency measures recommended
  • Summary table with measure name, installed cost, energy savings by utility, and O&M savings
  • Capital Intensive measures requiring Level III audit
  • Detailed energy analysis calculations
  • Measurement and verification (M&V) plan for verifying energy savings
  • All items from Level II Audit
  • Detailed information on capital intensive measures – including schematics, equipment specifications, design sequences and costs
  • Highly detailed financial evaluation