What to Have Ready Before You Ask a Utility for a Large-Load Study

The most common way a large-load study goes wrong is that it starts too early. A developer submits a request with a rough site, a guessed load, and no land under contract, then waits months for a study that can't be finished because the inputs keep changing. Utilities are not trying to be difficult. They need inputs that hold still long enough to model a substation and a transmission path.

Site control

Start here. A utility that asks for proof of site control is asking a simple question: is anyone actually able to build on this land? AEP Ohio requires proof of site control as part of its data center tariff, and Xcel's Colorado tariff will not count a data center's load toward served load until signed agreements are in place. Even where the utility doesn't ask for it at the first step, it will ask for it before anything gets built. A signed option or purchase agreement with a clear closing date is the usual evidence.

A load ramp, not a single number

A single peak megawatt figure is not enough. Utilities plan for when load arrives, not just how much. Prepare a month-by-month or year-by-year ramp that shows when each phase energizes, how much power each phase draws, and what happens if a phase slips. Ask yourself what the ramp looks like if the first customer delays by a year. A ramp that only works on the best-case timeline will be questioned, and it should be.

The site plan and the load profile

The utility will want to see where the substation would go, how the site is laid out, and how the facility will run across a typical day and season. A rough load profile, with the major loads, cooling, and any backup generation identified, is usually enough at the start. You don't need an engineered design yet, but the layout should be consistent with the ramp you submitted. A mismatch between the two is one of the quickest ways to lose credibility with a planning engineer.

Who pays for what

Study fees, deposits, and the cost of network upgrades are the parts of the process that surprise people most. Some tariffs charge a load study fee at the start, and others require a deposit before the study runs. The Xcel Colorado filing includes a $120,000 deposit. Before you submit, find out which costs are refundable, which are not, and which depend on the outcome of the study. Also ask who pays for upgrades beyond the substation, because that cost can change the economics of a site more than the land price does.

Finally, check the timeline you're actually asking for

Large transformers and breakers can take years to deliver, so a requested in-service date that looks reasonable on paper may not be achievable. Ask the utility what it currently quotes for major equipment and what its study and construction timelines look like before you commit to a date. A realistic schedule protects your credibility and gives you room to adjust the ramp instead of rewriting it under pressure.

If you can't answer these questions yet, that's a useful answer too. It usually means the project isn't ready to be studied, and the next step is to close the gaps first. The Kill Test is designed to make those gaps visible before the utility has to find them for you.