energy audit resources

An energy audit is an analysis of a building that indicates how you can reduce energy consumption and save energy costs. Its insight can lead to significant savings on your business's utility bill and O&M.

Energy Audits Can:

  • Reveal energy usage patterns

  • Identify saving opportunities

  • Elucidate the map of your energy use

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Energy Audit Types (CON'T)


Preliminary Energy Use Analysis:

  • Most basic energy audit
  • Analysis of historic energy use and costs.
  • Energy use is typically benchmarked

ASHRAE Audit Level 1 - Walk-Through Analysis

  • The basic starting point for building energy optimization
  • Involves interviews with select facility staff
  • A review of utility bills or other operating data
  • A walkthrough of the facility
  • The goal is to identify glaring areas of energy inefficiency.
  • The data is compiled and used to complete a preliminary report detailing low-cost/no-cost measures and potential capital improvements for further study in subsequent audits.

This level of detail is adequate for prioritizing energy efficiency projects and to assess whether a more detailed audit is necessary.

ASHRAE Audit Level 2 – Energy Survey and Analysis

This includes the ASHRAE Level 1 analysis, and adds:

  • Detailed energy calculations and financial analysis of proposed energy efficiency measures.
  • Energy consumption is broken out by end-use, identifying areas that present the greatest efficiency opportunities.
  • Utility rates are analyzed to determine if there are rate change opportunities.
  • Key building representatives are interviewed for insights into building operational characteristics, potential problem areas, and to define financial and non-financial goals of the audit.

This level of detail is adequate to justify project implementation.

ASHRAE Audit Level 3 – Detailed Analysis of Capital Intensive Modifications

  • Engineering analysis of the potential capital-intensive projects identified in the ASHRAE Level 2 Analysis.
  • More detailed field data gathering and more rigorous analysis.
  • Existing utility data is supplemented with sub-metering of major energy-consuming systems and monitoring of those system’s operating characteristics.

This level of detail is typically reserved for complex commercial and industrial buildings.


Taken from the Industrial Assessment Center MSU Website:


"If your company is determined eligible for an assessment, the MSU IAC team will conduct a one-day site visit after a pre-assessment and utility data are received. Recommendations for energy, waste, and production cost reductions are expected within two months."

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