Not Everyone Gets a Seat at the Backup Power Table
By Chuck Frye, CEO, Fortis Rose Engineering LLC
Deciding what actually needs backup power is a triage exercise, not a wish list: a load belongs on emergency or standby power only if losing it causes real harm or a real legal problem, not merely real annoyance. Everything else — however important it feels to the person asking — runs on utility power and takes its chances like the rest of us.
Here's a conversation we have on nearly every project, in some form: the client walks the site with us, and by the end of it, roughly everything has been nominated for backup power. The walk-in cooler, obviously. The security system, sure. The break room refrigerator, the decorative sign out front, and — we are not making this up — a corner office desk lamp, because "what if someone's working late." We understand the impulse. Nobody wants to be the department that got left in the dark. But a generator sized for everyone's worst-case anxiety is a generator sized wrong, and sizing it wrong is expensive in both directions.
The Conversation Nobody Wants to Start
"Is this really critical?" is an uncomfortable question to ask a client, mostly because the honest answer is often no, and nobody enjoys hearing that their thing is the one getting cut. But avoiding the question doesn't make the problem go away — it just moves it to the day the generator can't carry the load it was never actually sized for, and now everything goes down, including the parts that genuinely mattered.
The fix isn't a braver conversation. It's a more structured one — replacing "how important does this feel" with a short list of honest questions that produce the same answer regardless of who's in the room or how persuasively they argue for their desk lamp.
How to Actually Tell What's Critical
A load qualifies as genuinely critical when you can answer three questions honestly: how severe is the consequence if it loses power, how likely is that loss to actually happen, and how much warning would you get before it becomes a real problem. Score those honestly across every system in the building, and the sorting mostly does itself — no seniority, no persuasive arguments, no "just put it on the generator to be safe."
High-criticality loads are the ones where failure means someone gets hurt or a process becomes actively dangerous — fire alarms, egress lighting, medical gas systems, safety shutdowns. These map directly to NEC Article 700's Emergency Systems classification, with its 10-second restoration requirement. Medium-criticality loads matter a great deal to your operation but aren't a life-safety event if they blink — servers, cold storage, required ventilation, security systems. These typically land in NEC 701 or 702 territory, with restoration measured in seconds to minutes rather than an immediate life-safety response.
Everything else — the loads that would be inconvenient to lose but wouldn't hurt anyone or trigger a compliance violation — runs on utility power. That's not a demotion. It's just an honest read of what's actually at stake.
Why Oversizing Hurts as Much as Undersizing
The instinct to add "just one more thing" to the backup power list feels like caution, but it isn't free. Every load you add to emergency or standby power increases the generator size, the fuel storage required to run it, the transfer switch capacity, and the ongoing NFPA 110 testing and maintenance burden — all to protect something that was never actually at risk of causing harm. We typically build in a 20–30% capacity margin for legitimate future growth. That margin should be reserved for the mission, not spent covering a coffee maker.
Undersizing is the more obvious failure — a generator that can't carry its declared load will shed circuits or trip entirely, at exactly the moment you needed it to work. But oversizing is its own quiet failure: a bigger, more expensive system that takes longer to fuel, costs more to maintain, and still won't save you if the truly critical loads weren't the ones prioritized in the design. Right-sizing isn't a compromise between the two — it's the only version of the system that actually does its job at a cost someone can defend.
How Fortis Rose Runs This Conversation
We don't come into this as the villain arguing your team's priorities down, and we don't come in as a vendor happy to sell you the bigger generator either. We come in as the neutral party running the criticality assessment — walking the facility, scoring loads against real consequences instead of real feelings, and mapping the results to the NEC and NFPA 110 framework your AHJ is going to check anyway. That turns "why don't I get backup power" into "here's exactly why, and here's what would change the answer" — which is a much easier conversation to have, and a much easier design to defend later.
Frequently Asked Questions
How do you decide if a load is critical or just important?
A load is critical when its failure causes real harm, a safety incident, or a code violation — not simply inconvenience or lost productivity. Scoring each load's severity, likelihood of failure, and available warning time against those honest criteria, rather than how important it feels to the person requesting it, is what separates a defensible backup power design from an oversized one.
What happens if we put too many "nice to have" loads on the generator?
Every additional load increases the generator's required size, fuel storage, transfer switch capacity, and ongoing NFPA 110 testing burden — driving up both capital and maintenance cost to protect something that was never actually at risk of causing harm. It can also reduce the safety margin available for the loads that are genuinely critical.
Does a load being "important to the business" mean it should be on backup power?
Not necessarily. Business importance and life-safety criticality are different questions — a load can matter enormously to operations (like a production line) and still be correctly classified as Optional Standby (NEC 702) rather than Emergency (NEC 700), because losing it costs money rather than endangering people. Both deserve consideration, but at different tiers with different restoration requirements.
Who should be involved in deciding what's critical in a facility?
The people who understand the operational and safety consequences of a system failing — facilities management, safety officers, and department leads — should weigh in, but the final classification should be run against objective criteria and code requirements rather than decided by seniority or persuasion. That's typically where an outside engineering perspective helps keep the process honest.
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