Texas businesses have learned the hard way that grid reliability is a planning assumption, not a guarantee. Summer demand peaks, winter weather events, and localized distribution faults all produce the same result at your building: the lights go out and something expensive starts happening.

Backup and standby power is how you decide in advance which parts of that sentence apply to you. Here is a framework for planning it properly rather than buying a generator and hoping it is the right one.

Start With the Loads, Not the Generator

The single most common mistake is sizing equipment before defining what it has to carry. Every standby power project should begin with a written classification of loads into three groups.

Life safety and code-required loads

Egress lighting, exit signs, fire alarm, fire pumps, and smoke control are governed by code rather than preference. NEC Article 700 covers emergency systems and Article 701 covers legally required standby systems; both carry specific transfer time and installation requirements. These are not negotiable and they are not where cost optimization happens.

Business-critical loads

What actually costs you money when it stops. Refrigeration and freezers. Server rooms and network equipment. Point of sale. Process equipment mid-cycle. Sump and lift pumps. Access control and security. Anything whose interruption causes losses that compound — spoiled inventory, a ruined batch, a flooded basement — belongs here.

Convenience loads

General lighting, office receptacles, comfort HVAC. Nice to have. Often the difference between a manageable generator and one that doubles the project cost. NEC Article 702 covers optional standby systems, which is where most of this lands.

Write the list, put a dollar figure or a consequence next to each line, and then size equipment. The list is also what you hand to competing bidders so their proposals are actually comparable.

UPS and Generator Do Different Jobs

A UPS provides instantaneous, uninterrupted power for a limited duration. A generator provides extended power after a short transfer delay. They are not alternatives; they solve different halves of the problem.

Equipment that cannot tolerate even a momentary interruption — servers, storage arrays, controls, certain medical and laboratory equipment — needs UPS regardless of whether a generator exists. The generator then carries the extended outage while the UPS covers the transfer gap and provides orderly shutdown if the generator does not start. Facilities that install one and assume it covers both requirements discover the gap during the first real event.

Transfer Switch Selection

The transfer switch is the component that determines whether your standby system is an asset or a liability. Key decisions:

Automatic vs. manual. Automatic transfer costs more and eliminates the dependency on someone being on site and awake.
Open vs. closed transition. Open transition briefly interrupts power during transfer; closed transition momentarily parallels sources and requires utility coordination.
Service entrance rated or not, which affects upstream equipment requirements.
Load shedding capability, which lets a smaller generator serve a larger connected load by prioritizing circuits.
Bypass isolation, which allows the switch itself to be serviced without dropping the load — essential where uptime matters.

Improperly installed transfer equipment can backfeed the utility and endanger line workers. This is licensed, permitted, inspected work in every jurisdiction in the Metroplex — not a place for improvisation.

Fuel, Siting, and the Practical Constraints

Diesel systems require on-site storage, periodic fuel polishing, and a refueling plan for outages that run past the tank. Natural gas removes storage and fuel degradation concerns but depends on utility gas pressure remaining available, which is not guaranteed in every scenario. Neither answer is universally correct; the right one depends on your runtime requirement and risk tolerance.

Siting brings its own constraints: clearances, sound attenuation limits in mixed-use areas, exhaust routing, weather and flood exposure, air permitting for larger units, and physical access for the service truck. These are best resolved on paper, because discovering them after the pad is poured is expensive.

The Part Everyone Skips: Testing

A standby system that has never been exercised under load is an untested assumption. Batteries fail, fuel degrades, block heaters quit, coolant leaks, transfer switch contacts stick, and control boards fail — all silently, all while the unit appears to be ready.

A minimum testing regime

Monthly: start and run under load for the manufacturer’s specified interval, and log the result.
Monthly: verify battery condition, block heater operation, coolant, oil, and fuel level.
Annually: full-load test and a complete transfer sequence exercise.
Annually: inspect and service the transfer switch, including connection torque verification.
Per code and manufacturer schedule for life-safety systems, which carry stricter requirements.

Every test should generate a dated record. When an insurer, inspector, or tenant asks whether the system works, the log is the answer.

Integrating With the Rest of the Building

Standby power touches more than the generator pad. Load shedding may involve the building automation and control system. Sensitive equipment on standby circuits still needs proper grounding and surge protection, since generator sources and transfer events introduce their own transient conditions. And the whole system belongs in your preventive maintenance program rather than in a separate binder nobody opens.

Talk to Hargrove Electric

If your facility has standby power that has never been load tested — or none at all and a growing list of loads that cannot go down — start with the load classification. Hargrove Electric has served commercial and industrial clients across the Dallas–Fort Worth Metroplex for over 55 years, operating under Texas Electrical Contractor License #17522. Call 214-742-8665 or contact us online to schedule a walkthrough.