A small-business energy audit in one afternoon starts with three records: utility bills, an equipment list, and operating hours. Use them to separate unnecessary energy use from expensive demand peaks, then calculate which changes could actually lower your bill. Treat the afternoon as a screening assessment—not a promise of 20% savings or a substitute for a professional audit when equipment performance needs further investigation. EPA’s small-business guidance supports this progression from benchmarking and a walkthrough to more detailed assessment when warranted.
Small-Business Energy Audit: Savings Options and Billing Conditions
The amounts below are hypothetical U.S. examples in USD, not local utility rates, national averages, or guaranteed savings. The calculations appear later in this guide.
| Opportunity | What changes | Illustrative monthly bill reduction | Condition that determines the result |
|---|---|---|---|
| Shorten unnecessary lighting and standby hours | Electricity consumption falls by 96 kWh | USD 15.36 at USD 0.16/kWh | The removed operating hours must be unnecessary, and the avoided kWh must be billed at this marginal rate |
| Stagger flexible equipment operation | Billed demand falls from 30 kW to 25 kW | USD 90.00 at USD 18.00/kW-month | The change must reduce the tariff-defined billing demand—not merely move one equipment startup |
| Combine these two measures | Both kWh and billed kW fall | USD 105.36 | Energy savings and demand savings must be calculated separately without duplicating either benefit |
| Change to another eligible rate | The same load profile is billed differently | Compare the complete bill under each tariff, including fixed charges, time periods, and demand rules |
Energy charges depend on kWh consumed; demand charges depend on the tariff’s definition of demand; fixed charges generally do not fall simply because consumption decreases. That distinction explains why a small reduction in operating hours and a reduction in the monthly demand peak can have very different financial values.
Gather the Three Records Before the Walkthrough
1. Utility Bills and the Applicable Rate Schedule
Collect at least 12 consecutive months of bills, including separate supply and delivery bills where applicable. Record the meter number, billing dates, kWh, measured demand, billed demand, rate schedule, and individual charges. DOE’s 2024 energy-assessment guide recommends gathering 12 or more months of consecutive utility bills to establish a baseline.
A year of records helps distinguish recurring waste from seasonal heating, cooling, and business activity. One unusually high bill may reflect a longer billing period or more operating hours rather than inefficient equipment.
Retrieve the utility’s currently effective tariff for your service territory and rate class. Check:
- Energy charges in USD/kWh, including applicable variable supply and delivery charges.
- Demand charges in USD/kW-month, or another unit specified by the tariff.
- Peak and off-peak periods, seasonal rates, and demand-measurement intervals.
- Minimum bills, demand ratchets, and separate demand-charge components.
- Fixed charges, riders, and taxes.
DOE’s utility-rate guidance explains that demand charges may include time-of-use, non-coincident, and look-back provisions. A demand ratchet can keep billed demand elevated even after the current month’s measured peak falls.
Use your local tariff—not a national average—to value savings. A bill’s total USD divided by total kWh is useful for describing historical spending, but it can overstate avoided energy costs when that total includes fixed and demand charges.
2. Equipment List
List lighting, HVAC, refrigeration, water heating, office equipment, kitchen equipment, and major process loads. EPA’s small-business workbook organizes walkthrough opportunities around these systems because different businesses have different dominant energy uses.
For each item, record its quantity, electrical input power, operating schedule, and whether it can safely be turned off or rescheduled. Distinguish rated input power from observed operating power: a cycling refrigerator or variable-speed HVAC system does not necessarily draw its full nameplate power throughout every scheduled hour.
Use manufacturer documentation, existing monitoring records, or appropriate measurements by qualified personnel to improve uncertain estimates. Do not open energized panels or perform live electrical measurements as part of a DIY walkthrough.
3. Operating Hours
Write down customer hours, staff arrival and departure times, cleaning hours, deliveries, and equipment startup schedules. Include weekends and holidays.
The useful comparison is equipment operation versus actual need—not simply operation versus posted business hours. Refrigeration, security systems, servers, and required ventilation may need to run when the premises are closed. DOE specifically recommends matching HVAC schedules to occupancy and optimizing warmup and setback controls.
Follow a Four-Hour Screening Plan
This is a suggested editorial schedule for a small, accessible site with records already available—not a DOE-prescribed audit duration.
1. Review bills and rates — 30 minutes.
Identify the largest controllable charge and confirm how it is calculated. Obtain interval data if available; it can reveal monthly peaks and the timing of consumption.
2. Walk through the premises — 75 minutes.
Compare lighting, HVAC, and equipment schedules with actual occupancy. Record conditions without changing safety-critical settings or interrupting essential services.
3. Investigate operating-hour and peak mismatches — 45 minutes.
Look for unnecessary after-hours operation and equipment that runs simultaneously. Without interval data, record demand-reduction ideas as candidates for measurement rather than confirmed savings.
4. Calculate and rank opportunities — 60 minutes.
Estimate avoided kWh, assess any separate billed-demand reduction, and identify implementation costs. Rank measures by confidence, operational impact, and financial benefit.
5. Assign actions and follow-up — 30 minutes.
Give each selected measure an owner, a completion date, and a verification method. EPA’s workbook emphasizes assigning responsibilities and measuring results rather than stopping at a list of recommendations.
The afternoon should produce a short action register. It does not need to produce a fully instrumented analysis of every load.
Record Waste Points Without Inventing Savings
| System | Condition to look for | Inputs needed to calculate savings | Constraint to check |
|---|---|---|---|
| Lighting | Lights operating in unused spaces | Total input watts, avoidable hours, applicable energy rate | Required task, emergency, security, and egress lighting |
| Office equipment | Unnecessary awake or standby operation | Actual power difference between operating states, avoidable hours | IT policy, remote access, updates, and essential equipment |
| HVAC | Schedules extending beyond actual need | Runtime records and measured or modeled energy difference | Ventilation, humidity, freeze protection, comfort, and equipment requirements |
| Refrigeration | Door-seal problems or maintenance issues | Service findings and measured consumption | Food safety, product storage requirements, and manufacturer instructions |
| Flexible process loads | Overlapping operation during the billing peak | Interval demand data and operating schedules | Production needs and the utility’s billing-demand rules |
EPA identifies lighting controls, office-equipment power management, HVAC operation, and refrigeration maintenance as relevant small-business opportunities. The table turns those categories into observations and calculation inputs; it does not assign unsupported savings percentages.
A visible problem is not yet a verified financial benefit. For example, changing an HVAC schedule may affect both energy and demand, but its impact depends on weather, startup behavior, and occupied conditions. Record uncertain opportunities for follow-up instead of treating nameplate power multiplied by schedule hours as a measured result.
Common pitfall: kW and kWh are not interchangeable. Reducing operating hours can save energy without reducing the billing peak. Moving equipment to another time can reduce one demand charge but leave another unchanged—or create a new peak. Check every applicable demand component before assigning savings.
Hand-Calculate Lighting, Standby, and Demand Savings
Hypothetical Inputs and Assumptions
This example represents a fictional U.S. small business with a simplified flat-rate commercial electricity bill.
| Input | Assumed value | Unit or condition |
|---|---|---|
| Baseline monthly consumption | 6,000 | kWh |
| Baseline billed demand | 30 | kW |
| Avoidable energy charge | 0.16 | USD/kWh; combined variable charges |
| Demand rate | 18.00 | USD/kW-month |
| Fixed monthly charge | 35.00 | USD/month |
| Lighting quantity | 20 | Fixtures |
| Total input power per fixture | 30 | W, including driver losses |
| Avoidable lighting operation | 4 × 22 | Hours/day × days/month |
| Avoidable aggregate standby power | 120 | W; net reduction after necessary loads remain |
| Avoidable standby operation | 12 × 30 | Hours/day × days/month |
| Separate scheduling measure | 5 | kW reduction in billed demand |
Assume no time-of-use pricing, tiers, demand ratchet, minimum bill, additional riders, or taxes. The lighting and standby reductions occur outside the monthly peak and receive no demand-savings credit. The separate scheduling measure reduces billed demand without changing total kWh.
Calculate the Baseline Bill
For this simplified tariff:
[
C = E r_E + D r_D + F
]
Where:
- (C) = monthly electricity cost, USD.
- (E) = monthly energy, kWh.
- (r_E) = avoidable energy rate, USD/kWh.
- (D) = billed demand, kW.
- (r_D) = demand rate, USD/kW-month.
- (F) = fixed monthly charge, USD.
Substitute the inputs:
[
C_{\text{before}}
= (6{,}000 \times 0.16) + (30 \times 18.00) + 35.00
= \text{USD }1{,}535.00
]
This structure reflects the separate energy, demand, and fixed components described by DOE. Actual tariffs may require additional terms.
Calculate Avoidable Lighting Energy
For constant electrical input power:
[
\Delta E_{\text{lighting}}
= \frac{N \times W}{1{,}000} \times h \times d
]
[
\Delta E_{\text{lighting}}
= \frac{20 \times 30}{1{,}000} \times 4 \times 22
= 52.8\text{ kWh/month}
]
[
\Delta C_{\text{lighting}}
= 52.8 \times 0.16
= \text{USD }8.448\text{/month}
]
These savings come from eliminating unnecessary hours, not replacing fixtures. The assumed 30 W must represent each fixture’s total electrical input.
Calculate Avoidable Standby Energy
[
\Delta E_{\text{standby}}
= \frac{120}{1{,}000} \times 12 \times 30
= 43.2\text{ kWh/month}
]
[
\Delta C_{\text{standby}}
= 43.2 \times 0.16
= \text{USD }6.912\text{/month}
]
Combined energy savings are:
[
\Delta E = 52.8 + 43.2 = 96\text{ kWh/month}
]
[
\Delta C_E = 96 \times 0.16 = \text{USD }15.36\text{/month}
]
The 120 W assumption represents the power actually eliminated. Do not count essential always-on equipment or assume that every standby load can be disconnected.
Calculate the Separate Demand Reduction
Assume interval analysis confirms that revised scheduling lowers the tariff-defined billed demand from 30 kW to 25 kW:
[
\Delta C_D = (30 – 25) \times 18.00
= \text{USD }90.00\text{/month}
]
Staggering startup alone does not establish this result. The revised operation must lower demand over the utility’s measurement interval, and another interval must not replace it with an equally high peak. Ratchets and minimum-demand provisions can also limit the benefit.
Reconcile the Revised Bill
[
E_{\text{after}} = 6{,}000 – 96 = 5{,}904\text{ kWh}
]
[
C_{\text{after}}
= (5{,}904 \times 0.16) + (25 \times 18.00) + 35.00
= \text{USD }1{,}429.64
]
[
\Delta C
= 1{,}535.00 – 1{,}429.64
= \text{USD }105.36\text{/month}
]
The fixed charge stays unchanged. Energy savings contribute USD 15.36; demand savings contribute USD 90.00.
Use the Commercial Bill Calculator to cross-check a simplified bill only when its available inputs and assumptions match your tariff; retain the hand calculation to identify omitted charges.
These hypothetical results are not a savings guarantee, an equipment-sizing calculation, or approval to modify electrical installations.
Compare Scheduling Changes With Equipment Upgrades
Scheduling changes target unnecessary operation. Equipment upgrades target input power or operating efficiency during hours that remain necessary. EPA’s lighting guidance recognizes both approaches, and DOE recommends evaluating the sequence of upgrades because one measure can affect the value of another.
For a constant-power lighting replacement, calculate:
[
\Delta E_{\text{replacement}}
= (P_{\text{existing}} – P_{\text{replacement}})
\times h_{\text{remaining}}
]
Use kW for power and hours for operating time. If you have already removed unnecessary lighting hours, use the remaining hours in the replacement calculation. Otherwise, the same avoided consumption can be counted twice.
For measures requiring investment:
[
\text{Simple payback, years}
= \frac{\text{Net initial cost, USD}}
{\text{Annual net savings, USD/year}}
]
Include relevant equipment, installation, controls, commissioning, and incremental maintenance costs. Count incentives only after confirming eligibility and availability. Simple payback excludes financing, discounting, and savings after the payback date, so it is a screening metric rather than a complete investment analysis.
Use DOE and EPA Guidance for the Final Checklist
DOE’s Facility Energy Checklist covers occupancy-based HVAC schedules, infiltration, lighting, and controls. It is written for federal facilities, not specifically for small businesses. EPA’s ENERGY STAR small-business resource page provides the more directly applicable toolkit and audit resources. Both were checked for this 2026 guide.
Use the following adapted checklist to close the afternoon:
- Collect at least 12 consecutive months of utility bills.
- Confirm the meter, service territory, rate class, and tariff effective date.
- Separate kWh charges, demand charges, fixed charges, and other bill components.
- Obtain interval data where available and identify the relevant billing peaks.
- Compare equipment schedules with occupancy and operational requirements.
- Identify lighting and office-equipment changes that preserve necessary services.
- Record HVAC, refrigeration, and process opportunities needing qualified assessment.
- Keep measured values, documented ratings, and assumptions distinguishable.
- Calculate energy and demand savings separately.
- Check overlapping measures for duplicated savings.
- Assign an owner, completion date, and verification method to each action.
The checklist adapts DOE’s data-gathering and facility guidance and EPA’s walkthrough and action-planning approach; it is not an official DOE small-business audit form.
DOE’s 2024 audit guide recommends checking with the utility first for no- or low-cost audit services. Availability depends on the local program, so confirm the service and scope before relying on it.
Verify Savings After Implementation
Verify each completed change against the quantity it was intended to improve: kWh, billed kW, operating hours, or equipment performance. Compare periods with similar billing lengths, weather, occupancy, and production activity, and separate tariff changes from changes in consumption. EPA’s workbook makes measurement and verification part of the ongoing energy-management process.
A lower bill alone does not prove the measure worked; a higher bill alone does not prove it failed. Preserve the original inputs and assumptions, then replace estimates with observed results as records accumulate.
Refer uncertain controls, equipment faults, and installation changes to qualified professionals. An energy calculation or calculator does not replace the NEC, local AHJ requirements, manufacturer instructions, permits where required, or site-specific professional judgment.