Reading Your Electricity Bill Before Requesting a BESS Quote

Before requesting a battery energy storage system quote, separate the cost of electricity consumed from the cost of the demand your site places on the grid. Then connect those charges to the meter records that determine them. A battery capacity figure alone cannot explain which bill line would change.

Fort Carson in Colorado provides a documented example. The national laboratory's REopt case study records an 8.5 MWh, two-hour BESS implemented in January 2019, with controls that forecast demand peaks and schedule charging and discharging. This is an existing U.S. Army project involving other suppliers, not a HUA-X installation. Its scale is much larger than a single commercial cabinet; the useful comparison is how the project connects a bill, a meter boundary and a dispatch objective. [2]

1. Separate the bill before choosing a battery strategy

AECOM's May 2019 project presentation reports these Fort Carson figures. The underlying billing period is not identified. [1, p. 12]

The same slide identifies demand management as the opportunity and reports no time-of-use shifting opportunity. [1, p. 12]

DOE's rate guidance explains the distinction: energy charges concern kWh, demand charges concern a defined maximum in kW, and fixed charges depend on the rate schedule. A large demand share is a reason to investigate peak reduction; it is not the percentage of the bill that storage can eliminate. [4]

2. Identify the meters behind the charge

Fort Carson had six meters aggregated into one bill, and the project presentation says all six needed real-time monitoring. [1, p. 8]

For your own site, write the meter IDs on the data package and identify where the battery would connect. Ask the utility or engineer to explain how those readings become billed demand. The public case does not disclose the aggregation formula; six separate monthly maxima must not simply be added and labelled a coincident peak.

A factory can have a similar documentation problem when production, offices and charging equipment sit behind different meters. A quote should say which billing boundary it models and which loads it can influence. This is a question to resolve from your own drawings and tariff, not an assumed feature of the Fort Carson design.

3. Distinguish forecast savings from reported outcomes

The REopt project page gives $500,000 per year as estimated utility-bill savings. It describes preliminary design and savings analysis; that number is not presented as a published sequence of post-installation monthly invoices. [2]

DOE's 2020 award account subsequently reports more than $950,000 in one year after three energy measures at Fort Carson: battery storage, HVAC controls and LED lighting. That is a reported outcome for the combined work. The account does not isolate battery-only savings or provide the underlying bills and adjustment calculations. [3]

These numbers answer different questions. Do not subtract them, treat the larger number as proof of battery outperformance, or apply either figure to another site's quotation. For your project, ask for a comparison that identifies the baseline, reporting dates, tariff version and treatment of other operational changes. Keep the proposed dispatch calculation separate from later measurement and verification.

4. Find the interval that creates billed demand

A bill tells you the billed amount; interval records help explain when it arose. DOE recommends obtaining utility bills and interval data, including separate supply and distribution bills when applicable. Its glossary also distinguishes time-of-use demand, a maximum taken regardless of time of day, and demand ratchets that refer back to earlier peaks. [4]

Do not assume every utility uses the same interval. Duke Energy's Ohio business guide, for example, describes demand averaged over 15 minutes and explains that billed demand can differ from measured demand. This is a documented billing method, not evidence that Fort Carson or your facility uses that exact rule. Verify the current tariff before calculating a reduction. [5, pp. 9–10]

For a proposed peak target, the engineering analysis should show how much power is required at the billing meter and how long the contribution must continue. It should also show when the battery can recharge without creating another chargeable peak. A single selected spike cannot establish whether the strategy works across the available billing period.

The public Fort Carson sources used here do not provide a timestamped interval file. We therefore cannot reconstruct a dispatch curve, identify its peak day or calculate a smaller site's required battery capacity from this case.

5. Send a data package that a quote can use

Use the case to improve the questions attached to your inquiry:

Keep missing readings marked as missing. If you only have a short operating period, state its dates rather than representing it as a full operating year. Remove account credentials and payment details before arranging a suitable method to transfer site files.

With that package, the C&I BESS sizing guide can help frame the next discussion about power, usable energy and operating constraints. The 100 kW / 215 kWh cabinet and PowerFac-261 are product references to discuss after the duty is defined; this third-party case does not establish either product's suitability or U.S. project approvals.

Start a project inquiry with the country, utility, operating objective and dates of the records you can provide.

Sources checked September 23, 2026. Historical project figures retain their original context; checking a source in 2026 does not make its tariff or performance figures current.