Energy Audit Mistakes: Why Audits Fail to Deliver Savings

Why do some energy audits fail?

Common reasons include:

• the report is filed away;
• recommendations are too generic;
• actions are not prioritised;
• no one is made responsible;
• savings estimates are accepted without challenge;
• operational changes are ignored;
• controls and schedules are left unchanged;
• data is not reviewed afterwards;
• capital projects are pursued before low-cost actions;
• progress is not reported to senior management.

The problem is often not a lack of opportunity. It is a gap between diagnosis and implementation.

Mistake 1: Treating the report as the end of the process

One of the most common mistakes is assuming that commissioning and receiving the report completes the work.

The audit may have identified:

• heating operating too early;
• ventilation running after closing;
• high overnight electricity use;
• failed sensors;
• permanent overrides;
• unnecessary electric heating;
• poor zoning;
• worthwhile capital projects.

None of these findings creates a saving until someone acts.

Mistake 2: Commissioning a report without defining the outcome

An audit can disappoint when the organisation has not agreed what it needs from the work.

The organisation may need to:

• understand one poorly performing building;
• investigate high overnight use;
• prioritise capital investment;
• support an ESOS process;
• compare several sites;
• improve controls;
• provide evidence to trustees or senior management;
• challenge a contractor proposal.

If the objective is unclear, the audit may answer the wrong question.

Mistake 3: Accepting generic recommendations

A useful audit should produce recommendations that are specific to the building.

Generic statements such as:

• install LED lighting;
• improve staff awareness;
• consider solar panels;
• improve insulation;
• upgrade controls;

may be reasonable in principle, but they are not enough on their own.

The report should explain what problem has been identified, where it occurs, why the recommendation is appropriate, what evidence supports it and what should happen next.

Mistake 4: Failing to prioritise actions

A long list of recommendations can become difficult to manage. If every measure appears equally important, the organisation may do nothing.

Mistake 5: Ignoring low-cost operational changes

Organisations sometimes focus on visible capital projects and overlook operational waste.

Low-cost opportunities may include:

• shorter plant schedules;
• better weekend settings;
• reduced overnight operation;
• improved temperature control;
• removal of temporary overrides;
• clearer shutdown procedures;
• better coordination between teams.

Mistake 6: Relying solely on contractor savings estimates

Contractor proposals often include estimated savings and payback periods. These figures may be useful, but they should not be accepted without checking the assumptions.

Savings may depend on:

• operating hours;
• current equipment efficiency;
• future energy prices;
• occupancy;
• weather;
• control settings;
• expected system performance;
• maintenance;
• interaction with other systems.

Mistake 7: Failing to examine half-hourly data

Monthly bills show how much energy was used, but not when it was used.

Half-hourly electricity data can reveal:

• early morning start-up;
• high overnight baseload;
• weekend consumption;
• late shutdown;
• unusual peaks;
• changing operating patterns;
• equipment that appears to run continuously.

Mistake 8: Assuming the BMS is operating correctly

A Building Management System may display a schedule that appears sensible. That does not prove the building is operating according to it.

Problems may include:

• overrides left active;
• inaccurate sensors;
• local systems outside the BMS;
• plant that fails to stop;
• duplicated schedules;
• poor zoning;
• incorrect holiday settings;
• simultaneous heating and cooling;
• changes made by contractors.

Mistake 9: Assuming facilities teams already know every problem

Facilities and estates teams may understand the building very well, but they may not have access to every part of the energy picture.

Energy waste may sit between:

• finance;
• facilities;
• IT;
• operations;
• contractors;
• senior management.

Mistake 10: Not assigning responsibility

A recommendation without an owner is unlikely to be completed.

The action plan should identify:

• the action;
• the responsible person or team;
• the target date;
• the required budget;
• any dependencies;
• how completion will be confirmed.

Mistake 11: Failing to involve the right people

The energy audit process should involve people who understand the energy data, plant, controls, occupancy, operating hours, maintenance and financial decisions.

A recommendation may fail because the system operator was not consulted, finance did not understand the business case or procurement selected a different specification.

Mistake 12: Implementing changes without checking operational risk

Some systems operate continuously for valid reasons, including life-safety, security, servers, refrigeration, environmental controls and process-critical equipment.

The objective is not to switch off everything outside normal hours. It is to distinguish essential loads from avoidable ones.

Mistake 13: Assuming energy savings require reduced comfort

Good energy management should usually improve control rather than reduce acceptable conditions.

Examples include:

• heating the right areas at the right time;
• stopping simultaneous heating and cooling;
• correcting inaccurate sensors;
• improving zoning;
• preventing unnecessary overheating;
• matching ventilation to occupancy.

Mistake 14: Moving directly to solar panels

Solar PV can be valuable, but installing generation before understanding demand can lead to a weaker investment decision.

The organisation should first establish:

• how much electricity the building uses;
• when it uses it;
• the size of the daytime load;
• the level of overnight consumption;
• whether existing waste can be reduced;
• how much generated electricity will be used on site.

Mistake 15: Not verifying the savings afterwards

An action may be completed without delivering the expected result.

The organisation should verify:

• whether the action was implemented correctly;
• whether consumption changed;
• whether comfort was maintained;
• whether the expected saving appeared;
• whether any new problems were created;
• whether the change remained in place.

Verification may involve:

• reviewing half-hourly data;
• comparing monthly consumption;
• checking BMS trends;
• recording temperature;
• reading sub-meters;
• comparing before-and-after periods.

Mistake 16: Failing to monitor progress

Energy performance changes over time as schedules are altered, staff change, sensors fail, spaces change use and new equipment is installed.

A simple review may include:

• monthly energy use;
• overnight baseload;
• weekend profiles;
• action-plan status;
• unresolved faults;
• completed projects;
• measured savings;
• new operational changes.

Mistake 17: Losing the link between findings and budget decisions

Decision-makers may need to understand:

• the problem;
• the evidence;
• the annual cost of the waste;
• implementation cost;
• expected saving;
• simple payback;
• operational benefit;
• maintenance implications;
• risk of doing nothing;
• level of confidence.

The strongest business case may not always be the measure with the shortest payback.

Mistake 18: Failing to revisit old recommendations

An audit completed several years ago may still contain useful findings, but circumstances can change.

The organisation should ask:

• Is the problem still present?
• Has the expected cost changed?
• Is the saving still realistic?
• Has another project affected the recommendation?
• Does the action remain a priority?
• Is new evidence available?

What should happen after the audit report is delivered?

How the four audit guides fit together

The wider building energy audit series answers the main questions organisations ask before and during an audit. This article addresses the next question:

“How do we make sure the audit actually delivers savings?”

Does implementation differ by sector?

Yes. Building type, occupancy and estate structure affect the practical barriers to implementation.

Questions to ask before accepting an audit report

• Does the report explain what is driving consumption?
• Are the recommendations specific to the building?
• Has half-hourly data been analysed?
• Has out-of-hours use been investigated?
• Have controls and schedules been checked?
• Are assumptions visible?
• Are costs and savings realistic?
• Are actions prioritised?
• Is responsibility clear?
• Are further investigations identified?
• Can progress be measured?
• Is a follow-up discussion included?

The real measure of a successful energy audit

A successful audit is defined by whether the organisation:

• understands the findings;
• acts on the right priorities;
• avoids poor investment decisions;
• reduces unnecessary consumption;
• improves control;
• verifies the results;
• maintains the improvement over time.

The report matters, but implementation and verification are what turn evidence into savings.