Power outages used to be a minor inconvenience. A few hours without lights, a flashlight hunt, maybe a cooler full of ice the next morning. For most of the country, that’s still the mental model.
Colorado is different.
In 2024, Xcel Energy intentionally cut power to more than 55,000 customers across the Front Range during high-wind advisory events, a proactive measure to prevent downed lines from sparking wildfires. Winter storms along the foothills can leave mountain properties isolated for days. Aging grid infrastructure, growing demand from new development, and an increasing frequency of extreme weather events mean that outages are arriving more often, and lasting longer, than they did a decade ago.
For a homeowner who has invested in a custom home (one designed with care, built with quality materials, and expected to perform for generations), the question of backup power deserves serious attention during the design phase, not as an afterthought once you’ve moved in.
This isn’t about fear. It’s about making an informed decision while you still have choices.
Why Colorado’s Grid Reliability Is a Real Design Consideration
Grid reliability varies significantly across the state, and the gap between urban core areas and rural or mountain properties is wide. Larimer, Boulder, and Weld County customers connected to secondary distribution lines see longer restoration times after outages than customers on primary feeder circuits closer to substations.
Mountain properties face additional factors that compound the problem: access roads that delay utility crews, single-line exposure to falling trees and ice, and weather conditions that can persist for days at a stretch. If your property is at elevation, or located more than ten or fifteen miles from a town center, planning for extended power loss isn’t pessimism, it’s reasonable home design.
At the same time, utility-scale disruptions like the 2024 voluntary shutoffs affect the urban and suburban Front Range just as much as mountain properties, and those outages can arrive with only a few hours’ notice.
A backup power strategy designed during the construction phase is easier to implement, less expensive to install, and far better integrated into your home than a system bolted on after the
fact. Conduit runs, panel sizing, load management wiring, generator pads, and transfer switch placement all become complicated and expensive retrofits if they aren’t part of the original plan.
The Three Main Approaches:
There is no single right answer for every household. The right backup strategy depends on several factors: how you use your home, where it’s located, what your energy load looks like, whether you have natural gas service or propane, and how long you need the system to carry you independently. Here’s a comparison of the primary options.
Standby Generators
A standby generator is a permanently installed, hardwired appliance that monitors grid power and starts automatically, usually within seconds of an outage. Most residential standby units run on natural gas or liquid propane and can operate continuously for as long as fuel supply allows.
For Colorado mountain properties and rural locations without natural gas service, propane-fed standby generators paired with a large tank (500 to 1,000 gallons is typical for whole-home backup) are the most common choice. They provide robust, continuous output that can carry an entire home including well pumps, electric ranges, HVAC systems, and EV chargers without rationing.
Sizing matters more in Colorado than it does in most of the country. Gas-fired equipment loses approximately 4% of its rated output for every 1,000 feet of elevation above sea level. At Fort Collins’ elevation of 5,000 feet, a generator delivers roughly 20% less than its nameplate rating. In the foothills at 7,000 feet, that derating climbs to 30%. In a mountain community at 9,000 feet, you’re looking at a 36% reduction. A 22 kW generator spec’d for a low-elevation home may need to be upsized to 28 kW or larger to deliver the same effective output at altitude. That’s a conversation worth having with your electrical contractor early in the design process.
Whole-home standby generator systems typically run $7,000 to $15,000 fully installed, including the unit, automatic transfer switch, and connection to fuel supply. They require an annual service and a monthly exercise cycle. They are one fo the most reliable solutions for extended outages where you need full household capacity without limitation.
The trade-offs are straightforward: they produce exhaust and noise, they depend on a continuous fuel supply, and they provide no value during normal grid operation. In high fire danger periods, some counties may also have restrictions on propane storage or require specific setback distances from structures.
Battery Storage Systems
Battery backup systems have matured considerably in the past five years. The leading residential options in 2026, including the Tesla Powerwall 3, Enphase IQ Battery 5P, and FranklinWH aPower 2, are reliable, code-compliant, and well-supported by local installers across Colorado’s Front Range.
Here’s what the numbers actually look like. The Tesla Powerwall 3 stores 13.5 kWh and delivers 11.5 kW of continuous output; installed cost runs $15,000 to $16,200 for a single unit. The Enphase IQ Battery 5P stores 5 kWh per module with a 3.84 kW continuous output per unit, and stacks cleanly. Most whole-home applications use two to four modules, bringing installed cost to $12,000 to $32,000 depending on quantity. The FranklinWH aPower 2 stores 15 kWh and delivers 10 kW continuous, with installed costs between $14,000 and $17,000. Generac also has a permanent wall-mounted battery solution.
For a typical Colorado home consuming 30 to 40 kWh per day, a single battery unit covers essential loads for roughly twelve to eighteen hours. Powering a full home through a two- or three-day outage requires either multiple battery units, a solar charging source to replenish storage during the day, or a hybrid approach that combines battery backup with a smaller generator for recharging.
Portable Battery Units: A Lower-Cost Entry Point
Not every backup power solution needs to be hardwired into the home’s electrical panel. Portable power stations from brands like EcoFlow and Jackery occupy a different part of the market: lower upfront cost, no installation required, and enough capacity to cover critical loads through a short to moderate outage.
The EcoFlow Delta Pro 3 is one of the more capable units in this category. It stores 4,096 Wh (roughly four kilowatt-hours) and delivers 4,000W of continuous AC output, enough to run a refrigerator, several lights, a fan, internet equipment, and device charging simultaneously. MSRP runs around $3,699, with frequent sales bringing it to $2,099 to $2,500. The unit is expandable by adding external battery packs, with total capacity scalable up to 48 kWh if multiple expansion units are added. The Jackery Explorer 3000 Pro is a comparable option at 3,024 Wh and 3,000W output, available at major retailers including Best Buy for roughly $2,000 to $2,500.
These units don’t replace a hardwired system for whole-home or extended backup. Their continuous output is lower than a Powerwall or FranklinWH, and managing what’s plugged into them during an outage may take active attention. What they do well is provide meaningful coverage for critical loads (refrigerator, lights, phone charging, a CPAP machine) at a fraction of
the installed cost, with zero permitting, zero electrician fees, and the added flexibility of taking them camping or using them on a job site.
For a homeowner building a high-performance home in Colorado who wants a backup safety net without committing to a full installation, a portable unit is a reasonable starting point. It’s also worth noting that some manufacturers, including both EcoFlow and Jackery, offer optional home panel integration kits that let a portable unit connect to selected circuits in the electrical panel, splitting the difference between a portable device and a true hardwired system.
How Battery Systems Charge Without Solar
Whether the unit is a hardwired Powerwall or a portable EcoFlow, every home battery system can charge directly from the grid through a standard AC connection. For hardwired systems, this happens automatically and passively. When grid power is available, the battery charges during off-peak hours (or continuously, depending on how the system is configured) so it’s ready with a full charge when an outage hits. Most installed systems reach a full charge in eight to twelve hours from the grid, depending on the charger’s input rate.
Portable units charge from a standard wall outlet in two to four hours. The EcoFlow Delta Pro 3, for example, reaches a full charge in under two hours when connected to a 240V outlet using an EV adapter, or in roughly four hours from a standard 120V household outlet.
On the incentive side: through the end of 2025, battery storage qualified for a 30% federal tax credit under Section 25D. That credit was eliminated by the One Big Beautiful Bill Act signed in July 2025 and no longer applies to systems installed in 2026 or beyond. If you’re in the design and planning phase now, that change affects the financial picture. Battery systems are meaningfully more expensive on a net-cost basis than they were a year ago.
Battery storage has real advantages that standby generators don’t. It operates silently. It requires no fuel deliveries and no monthly exercise. It responds to an outage instantaneously, not in thirty seconds but in a fraction of a second, which matters for sensitive electronics and home automation systems. When paired with solar, it can recharge itself during an extended outage as long as the sun is out, eliminating the fuel supply problem entirely.
Solar + Battery: When the Two Work Together
Solar panels alone provide no backup power during a grid outage, unless you have a battery storage system or a specific grid-forming inverter. This surprises a lot of homeowners. Standard grid-tied solar systems shut down when the grid goes out, a safety requirement that prevents back-feeding energized lines that utility workers may be trying to repair.
When solar and battery storage are designed together, the picture changes substantially. A well-sized solar-plus-storage system can run a home indefinitely through a summer or
shoulder-season outage, recharging the batteries each day while covering daytime loads directly. In Colorado, with an average of 300 sunny days per year, that’s a meaningful operational advantage.
The caveat is winter. Colorado’s high-altitude winters bring extended cloudy periods, heavy snowfall that covers panels, and shorter daylight hours. These are the conditions that reduce solar output precisely when heating demand is highest. A solar-plus-storage system designed for summer self-sufficiency may not provide the same capability in February. For mountain properties and homes with significant heating loads, the honest conversation includes either oversizing the solar array and battery bank for winter conditions or pairing the system with a propane backup generator for deep-winter coverage.
System economics have shifted with the expiration of the 25D credit, but solar still qualifies for the 30% investment tax credit through 2032 when paired with battery storage under the commercial Section 48E credit in certain third-party ownership structures. The residential incentive landscape is evolving, and a qualified solar contractor can walk you through what’s currently available at the federal and state level.
The Emerging Option: Your Electric Vehicle as a Backup Generator
Vehicle-to-home (V2H) charging is no longer a niche technology. If you’re building a home and considering an EV purchase, the two decisions are starting to intersect in genuinely useful ways. In fact, Larimer County now requires all new homes to be pre-wired for an EV charger and future solar tie-in.
The Ford F-150 Lightning with the Charge Station Pro delivers up to 9.6 kW of continuous output from its 98 to 131 kWh battery, enough to run a typical home for three to ten days on a full charge, depending on load. The full system including bidirectional charger hardware and integration equipment runs approximately $5,000 to $8,700 installed. The Chevrolet Silverado EV with GM Energy’s PowerShift Charger provides up to 10.2 kW output from a similar battery capacity, with total installed costs of $10,000 to $13,000.
For homeowners planning to own a compatible EV anyway, this represents compelling value. The vehicle itself provides the energy storage, and the home integration system simply unlocks access to it during an outage. A full battery can carry a well-managed home for three to five days without any recharging, and longer with solar supplementation or careful load management.
The constraints are real. The vehicle needs to be home and plugged in when the outage occurs. Its useful range is reduced by the energy discharged during a backup event. Not all EVs support bidirectional charging, and the installer network for V2H systems is still thinner than for conventional battery storage or generator installation. But for a homeowner who works from home, uses their truck for recreation rather than daily commuting, and prefers to avoid a separate generator installation, V2H deserves consideration.
How High-Performance Homes Change the Math
One detail that often gets overlooked in the backup power conversation: a high-performance home needs less backup capacity than a standard code-built home.
A Passive House or other well-deisgned homes with robust envelopes can reduce total energy consumption by 60 to 80% compared to a conventional home of the same size. The combination of superior envelope insulation, triple-pane windows, mechanical heat recovery ventilation, and optimized thermal mass means that the heating and cooling systems are running a fraction of the time. Even a modest battery system can maintain comfortable interior temperatures for an extended period.
Put plainly: a 3,000-square-foot conventional home might require a 22 kW standby generator and multiple battery units to maintain full functionality during an outage. A 3,000-square-foot Passive House may be adequately served by two Powerwall 3 units and a modest solar array, a significantly lower investment that covers critical loads with room to spare.
This is one reason why energy modeling during the design phase matters. When you understand your actual load profile (not just peak wattage but daily consumption patterns by season), you can right-size a backup system instead of over-engineering it. The backup power conversation and the building performance conversation belong in the same room.
Whole-Home Backup vs. Critical Circuits: Choosing the Right Coverage Level
Before settling on a specific technology, there’s a more fundamental question worth answering: how much of your home actually needs to stay on during an outage?
Most homeowners default to the assumption that backup power means backing up everything. That instinct is understandable, but it’s also the assumption that makes backup systems feel prohibitively expensive. The difference between a whole-home backup strategy and a critical
circuits strategy isn’t just a cost difference. It’s a different way of thinking about what an outage actually costs you.
What Whole-Home Backup Covers
A whole-home backup system is designed to carry every circuit in the house at its normal operating capacity. Your EV charger, the electric range, the hot tub, the workshop, the guest suite you use four times a year. Everything stays on, exactly as it would if the grid were up. For most homes, that requires either a large standby generator or a substantial battery bank, often three or more units depending on daily consumption.
This approach makes sense in specific situations. If you run a home business that depends on continuous power, if you have medical equipment that cannot be interrupted, or if you’re on a rural property where outages routinely last several days and you need to maintain full household function without rationing anything, whole-home backup justifies its cost. It’s also the simpler system to live with. There’s no thought required. The house just keeps running. The downside is the significantly higher upfront cost of whole-house systems.
What Critical Circuits Backup Covers
A critical circuits system backs up only the loads that actually matter during an outage. These are routed through a separate, dedicated critical load panel, which the backup system powers while the rest of the home’s circuits remain offline until grid power is restored.
The list of genuinely critical loads is shorter than most homeowners expect. For a Colorado custom home, it typically includes:
– The well pump, if the property is on a private well
– The heating system (furnace, heat pump, or ERV fan)
– The refrigerator and freezer
– A handful of lighting circuits covering the main living areas
– Internet and device charging
– A bathroom or two
That’s usually 15 to 25 amps of continuous load, a small fraction of what a full home draws at peak. A single Tesla Powerwall 3 or FranklinWH aPower 2 can cover that load comfortably for 24 hours or more, with solar extending that indefinitely through a daytime outage. A modest 14 kW standby generator handles it with capacity to spare, and at significantly lower installed cost than a unit sized for whole-home coverage.
The practical trade-off is that you have to be intentional during an outage. For example, if the electric range is not on a critical circuit, you’re cooking on a gas burner or eating cold food. The EV charger is off. The home theater is dark. For most outage scenarios (a few hours to a day or two), these are easy accommodations, not hardships.
How to Decide Which Approach Fits Your Home
The honest starting point is duration. Short outages (a few hours, which account for the majority of outage events on the Front Range) don’t require backup at all for most households. Moderate outages (six to twenty-four hours) are well-covered by a critical circuits battery system with no generator needed. Extended outages (multiple days) are where the whole-home versus critical circuits decision carries real weight, because the longer the outage, the more the absence of “comfort” loads starts to feel like a problem.
Location matters too. Mountain properties with private wells and limited road access are more likely to face extended outages than suburban Front Range properties, which makes the investment in more robust coverage easier to justify. A Fort Collins home two miles from a substation has different risk calculus than a Rist Canyon property at 7,200 feet.
The age and health profile of your household also factors in. If you have family members with medical needs, infants, or elderly residents who cannot manage easily in a partially powered home, the calculus shifts toward more comprehensive coverage regardless of outage probability.
One more consideration that applies specifically to custom homes built to a high-performance standard: the critical/whole-home distinction matters less than it does for conventional homes. When the envelope is tight enough and the heating system efficient enough, a high-performance home stays comfortable for a very long time on minimal energy input. The “critical loads” that keep occupants safe and healthy in a Passive House draw so little power that even a modest battery system can carry them through a multi-day event. The home itself does much of the work.
This is the conversation worth having during the design phase. Not just “what size generator do I need?” but “what does this home actually need to stay safe and livable, and how does the building’s performance change that number?” The answer often surprises people, and it usually makes the backup power budget more manageable than the initial estimates suggest.
Making the Decision: What to Think About Before You Build
The question isn’t simply which backup option is best in the abstract. It’s which combination of options fits your property, your lifestyle, your energy use, and your budget. Here’s a framework for working through it:
Start with your location and outage risk profile. A suburban Fort Collins property on a primary feeder circuit has a different risk profile than a mountain home twelve miles from the nearest town. Know your baseline exposure before sizing a solution.
Identify your critical loads. For most households, the truly critical systems are refrigeration, well pump (if applicable), heating and cooling, a few lighting circuits, and device charging. Everything else is comfort, not necessity. A partial-home battery backup system covering only the critical loads costs significantly less than a whole-home solution, and may be all you need for the vast majority of outage scenarios.
Consider fuel access. Mountain and rural properties often can’t rely on continuous natural gas service, which makes propane or battery storage more relevant. Propane requires tank sizing, delivery scheduling, and coordination with a fuel supplier. Battery storage eliminates the fuel variable entirely but introduces capacity limits.
Plan for it during construction. Whether you choose a generator, battery storage, or a hybrid approach, the time to integrate backup power infrastructure is during the design and preconstruction planning phase, not after you’ve moved in. Generator pad placement, conduit runs, load center configuration, and solar mounting all require coordination with your builder and electrical contractor, ideally early on in the design process.
At Elevated Design Build, we work alongside homeowners and energy consultants while working through the design to make sure the home’s electrical infrastructure is ready to support whatever backup strategy they choose. Getting that coordination right (across the building envelope, the mechanical systems, and the electrical plan) is part of what separates a thoughtfully designed custom home from one that answers each trade question in isolation.
The grid will fail again. Whether it’s a wildfire-prevention shutoff, a winter storm, or a mundane equipment failure on a summer afternoon; the question isn’t whether it will happen, it’s when, and for how long. Building a home that can handle it without drama is simply part of building thoughtfully.
Thinking through the energy and resilience strategy for your Colorado custom home? Connect with the team at Elevated Design Build to discuss how backup power planning fits into your overall design.
