NFPA just announced the theme for Fire Prevention Week 2026: “Charge into Fire Safety: Safe Charging Is a Superpower.” Running October 4-10, this year’s campaign focuses on lithium-ion battery fires, the fastest-growing fire hazard category in both residential and commercial buildings. If you own or manage a commercial building in Denver, that designation matters beyond a national awareness week. E-bikes, EV charging stations, battery energy storage systems, and electric forklifts are showing up in Front Range buildings at a rate that most existing fire protection plans weren’t designed to handle.
Why Lithium-Ion Fires Are Different
A conventional fire needs three things to burn: fuel, oxygen, and heat. Remove any one and the fire goes out. That’s the principle behind every fire suppression method, including sprinklers: get enough water on the fuel to cool it below its ignition point.
Lithium-ion batteries don’t follow those rules. When a cell reaches a failure threshold, from overcharging, physical damage, a manufacturing defect, or heat exposure, it enters a state called thermal runaway. The cell begins generating heat faster than it can dissipate it. As the temperature climbs, the battery’s electrolyte breaks down and releases flammable gases. The cell vents, ignites, and the reaction becomes self-sustaining. The cathode material releases oxygen internally as it degrades, which means the fire has a partial oxygen supply built into the chemistry itself. You cannot simply suffocate it.
What Your Sprinkler System Can Do (and What It Can’t)
Standard wet-pipe sprinklers, the most common system type in Denver commercial buildings, are effective fire control tools for most occupancy types. When a lithium-ion battery goes into thermal runaway, they remain valuable, but with an important limitation.
What sprinklers do well: They suppress secondary fires. If a burning battery ignites adjacent combustibles, such as shelving, packaging, flooring, or structural framing, sprinklers will attack that fire effectively. They also cool surrounding batteries, which can slow or prevent thermal runaway from spreading to adjacent cells. Containing a single cell failure to a single battery pack instead of an entire storage rack is a meaningful outcome.
What sprinklers cannot reliably do: Stop thermal runaway in a cell that has already failed. Once the internal reaction is underway, water cooling cannot interrupt it in most cases. The cell will burn until the reaction is complete. Sprinklers reduce the consequences significantly, but they are one layer of defense, not the whole answer.
This distinction matters for how you think about your fire protection plan. A well-maintained sprinkler system is essential. It is not, by itself, a complete response to battery fire risk.
What the Code Requires
Two NFPA standards govern fire protection for commercial battery installations on the Front Range.
NFPA 855, the Standard for the Installation of Stationary Energy Storage Systems, applies to large battery installations, including buildings with solar-plus-storage systems, demand-charge management setups, or grid-tied backup power. The 2026 edition, currently being adopted by jurisdictions across Colorado, expands coverage to additional battery chemistries and requires formal hazard mitigation analysis for new installations. If your building has a stationary energy storage system, this standard determines what fire protection is required.
NFPA 13, which governs sprinkler system design and installation, affects occupancies with battery storage as well. Sprinkler density and coverage area requirements can change based on the fire load present in a space. A warehouse or parking structure that added high-density battery charging may have different sprinkler requirements than the same space without it.
Denver’s AHJ enforces both standards. If you’ve made significant changes to how your building uses battery power since the sprinkler system was last reviewed, a re-evaluation may be warranted.
Which Front Range Buildings Are Most Exposed
The buildings most likely to face lithium-ion fire risk without adequate fire protection planning are not necessarily purpose-built battery facilities. They are:
- Parking garages that added EV charging stations in the last few years, often without a formal fire protection review
- Warehouses and distribution centers that shifted from gas-powered to electric forklifts
- Mixed-use and multi-family buildings in Denver, Aurora, and Boulder where e-bike and e-scooter charging has become routine in storage rooms and bike cages
- Office buildings and commercial spaces with battery backup systems added for business continuity after a power disruption
Each of those scenarios involves a material change to the fire load in the building. In many cases, the sprinkler system was designed before that equipment arrived.
What This Means for Your Building
The right first step is straightforward: pull your most recent sprinkler inspection report and compare your current occupancy against what your building is actually used for today. If EVs are charging in your garage, if e-bikes are stored indoors overnight, or if you’ve added a battery energy storage system, your fire protection plan should reflect that.
The second step is to make sure your sprinkler system is in full working order, because it is still your primary line of defense even against lithium-ion fire scenarios. A system with closed valves, corroded heads, or overdue inspections offers far less protection than a properly maintained one.
If you’d like help reviewing your current system against what’s actually in your building, Elevation Fire Protection serves Denver, Aurora, Boulder, Fort Collins, and Cheyenne every week. Visit our inspections and testing page or call us at (720) 382-9669.