If you’ve ever tried to build the business case for a cold-storage upgrade, you’ve heard the sacred question:

“Sounds great… how many kWh does it save?”

The problem is, your utility doesn’t bill you for average behavior; it bills you for your worst 15 minutes.

Also, the $/kW side of the bill isn’t getting more gentle. With load growth from data centers and grid upgrades driven by electrification, capacity-related costs are rising across many regions (see DOE’s overview of rising data-center electricity demand).

So when we talk about IceRack®, the point isn’t “efficiency” in the traditional sense. The point is timing: keep products safe, keep operations moving, and move the hardest compressor work away from the most expensive (and often most carbon-intensive) hours.

The Problem Isn’t Energy—It’s Timing

Refrigerated facilities pay for energy (kWh) and demand (kW). Demand charges are typically based on your single highest 15- or 30-minute average demand each billing cycle (see An Introduction to Demand Charges from Clean Energy Group/NREL).

That one ugly interval can price a huge chunk of your month—often 30% to 70% of the bill, depending on the tariff and load shape (see NREL’s demand-charge storage market survey).

So you can run beautifully for 29 days… and still get wrecked because on a hot afternoon, everything stacks up at once: compressors, defrost, doors, and high head pressure. Peak is a timing problem wearing an efficiency costume.

What IceRack® Changes

IceRack® is thermal energy storage. It makes ice when power is cheaper and the refrigeration system can do the work more efficiently (often overnight), then it discharges that stored cooling during the ugly afternoon window. Same cooling. Different timing.

If you want the plain-English version of how ice storage shifts cooling loads, DOE’s ice-storage primer is a solid starting point.

Business-case wise, that timing shift tends to deliver three buckets of value:

Demand-charge reduction (kW): fewer peak spikes, smaller demand bill.
TOU arbitrage (kWh): when TOU applies, move work to cheaper hours.
Operational headroom: reduce “summer panic” and defer capacity upgrades.

Where Business Cases Go Wrong (and Where Decarbonization Shows Up)

Most proposals die because they’re framed like a lighting retrofit:

“Here are the kWh savings.”

But in cold storage, you can cut kWh and still hit the same peak. If your case doesn’t clearly show reduced kW (and when), finance will treat it like a nice idea with unclear payback.

Now the decarbonization part: peak hours aren’t just pricey; they can be dirtier. When the grid peaks, operators often dispatch peaker plants (GAO’s overview is a useful explainer). Sandia has also summarized why replacing peakers with flexible resources can reduce emissions and costs. And if you need a baseline source for grid emissions rates by region, EPA’s eGRID is the standard reference.

Build Around Demand (Not Hope)

A good IceRack® business case is built from your load shape, not your feelings.

Pull 12 months of interval data (or at least last summer). Circle the timestamp of your highest demand. That one interval is your villain origin story.

Then do the simple math:

How many kW can you reliably shift out of that window without risking product?
What’s your effective demand charge ($/kW-month) in the months that matter?
What TOU spread (if any) are you capturing by charging off-peak and discharging on-peak?

That’s the core ROI.

Turn Operations Into Dollars

IceRack® is shifting when refrigeration does the hardest work. That unlocks operator-relevant value:

Less stress on hot afternoons (and fewer bad surprises).
Capacity headroom (delay service upgrades, rack additions, or both).
Optional DR revenue: stored cooling can help participate without product risk (LBNL’s refrigerated warehouse demand response guide is still one of the most practical references on real-world strategies).

IceRack® shines when the tariff has teeth: high demand charges, meaningful peak/off-peak spreads, or DR programs that pay for flexibility. Flat rates and tiny demand charges make ROI harder—until the next tariff change.

IceRack® requires capital. What kills projects isn’t cost—it’s fuzzy math. Be clear on installed cost, expected kW impact, expected bill impact, and how you’ll verify performance. And don’t ignore incentives: thermal storage can qualify under federal energy-storage credit pathways (IRS: Clean Electricity Investment Credit).