Ask a communications center manager if they’re shopping for backup power and most will say no. Ask if they have a DC power plant, and the conversation changes. That question kept surfacing on the APCO International 2026 show floor in San Antonio, where Evoltix exhibited the Zero-Glitch Power Module (ZPM) and the Vault Power Shelter, and it points to something worth unpacking about how public safety agencies actually approach backup power decisions.
APCO’s 2026 conference ran August 2-5. APCO International, founded in 1935, is the world’s oldest and largest professional association for public safety communications, representing more than 45,000 members who run 911 centers, dispatch consoles, and public safety radio networks. Most agencies working through a backup power decision right now already own some form of it, usually a UPS, and it usually isn’t doing what they need it to do anymore.
The ZPM is not a UPS. It is what public safety communications teams install when a UPS is no longer enough.
Source: APCO International, “About APCO,” apcointl.org.
Here is what that pattern reveals, and what it means if you’re the one making this call for your network.
Why “Public Safety Backup Power” Conversations Start With a DC Power Plant, Not a UPS
Agencies evaluating backup power rarely open by describing a need. They open by describing their equipment: a rectifier, a battery string, a UPS that has already been swapped out once or twice. That is not a framing problem. It is a sign that most communications centers, radio shops running P25 (Project 25) systems, and network teams already have a power system in place, and the system itself is what they are trying to solve for, not backup power in the abstract.
One of the most common technical questions agencies raise is about power continuity for the servers and consoles running CAD (computer-aided dispatch) software, sometimes framed as a need for 3-phase power at the central site. CAD is the middleware that keeps a legacy 911 system talking to newer platforms, and to the neighboring center that may need to pick up call load during a disaster. If that layer goes down, the failure is not local to one desk, which is why agencies increasingly plan backup power around the whole CAD environment rather than the radio infrastructure alone.
That is the frame the ZPM was built around: a power intelligence system that treats backup power as infrastructure to be managed, not a spare part swapped in after something fails.
UPS Reliability, Budget Cycles, and Footprint: The Constraints Actually Driving This Decision
Three constraints shape most of these decisions:
- UPS reliability, measured in minutes versus hours. Across public safety networks, UPS reliability is not a theoretical concern raised in a sales conversation. It’s described directly: what the system does when the grid blinks, and how often someone has had to find out the hard way. Part of that is a runtime problem: a standard UPS typically holds a dispatch load for 15 to 30 minutes. On a 1 kW console load, a ZPM is rated for 7.68 hours on the base configuration, roughly double that on the next size up, which clears the 8-hour benchmark FirstNet set for Band 14 sites rather than approaching it. Part of it is a battery-life problem: lithium iron phosphate cells are rated for up to 15 years versus the 3 to 5 years typical of the lead-acid batteries most legacy UPS units still run on, which is most of what “we swap this thing every few years” is actually describing.
- Footprint and remote visibility. Agencies weighing a UPS replacement consistently cite physical footprint as its own constraint. A rack-mounted ZPM (19 inches wide, 24 inches deep, 84 inches tall, 850 lbs fully configured) has to compete for space in communications rooms and shelters already crowded with radios and consoles. Remote visibility matters just as much: IntelliCore surfaces alarms and trending data across up to 26 mappable dry contacts without requiring a dedicated Network Operations Center (NOC). Most small and mid-size communications centers, including many PSAPs (public safety answering points), do not have a NOC. They have a communications team that also does everything else.
- Budget timing. Backup power purchases at this level move on budget cycles, not on urgency alone, even when the urgency is real. That’s a planning constraint, not a lack of seriousness about the problem.
If your backup power still depends on someone driving to the site to find out what’s wrong, it was designed for a network that no longer exists.
The Grid Is Not a Binary, and Neither Is Backup Power
Public safety power planning increasingly describes conditions somewhere between two extremes: clean, reliable utility power on one end, and a site that loses grid power for days during a major storm on the other. Most public safety sites live somewhere in the middle, on a stretch of that line where power is present but not always clean, and where a specific kind of weather event or infrastructure failure is what finally takes the grid down. A county communications center can run on clean utility power for years and then lose it for four days during an ice storm, with no warning that the multi-day scenario was coming.
That is a more useful way to think about backup power than “on-grid” versus “off-grid.” A site can be on the grid today and off it for a week next spring. The ZPM, the Vault Power Shelter, and the Cabinet each answer a different point on that same line, from a rack in a climate-controlled communications room to a fully assembled, factory-tested shelter for a remote radio site.
What This Means If You Are Evaluating Backup Power for a 911 Network
A couple of practical takeaways for anyone doing this evaluation right now.
- Price the decision on total cost, not the sticker price. Evoltix’s own CapEx/OpEx analysis puts total savings at roughly $650,000 over 10 years per site, with a payback period of about 3 years and generator runtime reductions of up to 91% in field deployments. Those are aggregate figures; your site’s numbers will depend on load profile and current generator hours.
- Ask for the field reference, not just the data sheet. One state DOT network started with a single ZPM unit and has since scaled to more than 20 after seeing the field results.
If your team is somewhere in the middle of that grid spectrum and trying to figure out whether a UPS replacement or a full power intelligence system is the right call, talk to us. Request a working session with the Evoltix team at evoltixenergy.com/contact/, call (855) 964-9274, or email powered@evoltixenergy.com. Prefer to look at the specifics first? Compare the ZPM, a UPS, and a DC power system side by side.
Related Reading
Evoltix Heads to APCO International 2026
What Does a Backup Power Failure Cost a Public Safety Network?
How Grid Instability Is Affecting 911 Dispatch Infrastructure
