Planning a Standby Generator for a Houston Commercial Property
Houston property owners know what a long power outage can do. Hurricanes, tropical storms and winter freezes have left buildings dark, kept tenants out of their spaces and allowed heat, humidity or frozen pipes to damage property. For many commercial and multifamily owners, a standby generator has moved from a nice-to-have to part of the capital plan.
A generator project is more than buying equipment. It involves deciding what the building truly needs to keep running, finding a safe place for the unit, connecting it properly to the electrical system and keeping it ready for the day it is needed. This guide walks owners and property managers through the planning steps. It is general information; your electrical engineer, electrical contractor and general contractor will confirm what applies to your property.
Start with what needs power
The biggest decision is what the generator should carry. Common options:
- Life safety only: Emergency lighting, fire alarm and other systems the code requires to stay powered.
- Critical systems: Elevators, sump or lift pumps, security, phones, data rooms, refrigeration or medical equipment.
- Partial building: Selected panels, such as a leasing office, a clubhouse used as a cooling or warming area, or common-area lighting.
- Whole building: Everything, including air conditioning, which takes much more capacity.
Make a list of what must run, what would be nice to run and what can wait. That list drives the size, cost and location of the system.
Know the standards involved
Emergency and standby power systems are generally covered by NFPA 110, the Standard for Emergency and Standby Power Systems, along with the electrical code, NFPA 70. Your electrical engineer will determine which requirements apply based on what the generator serves and the building's occupancy.
Permits in Houston
In the City of Houston, the Permitting Center's Generator Permit page explains that registered electrical contractors who install a standby generator must apply for an electrical permit, and that plan review and inspection are required. Depending on the project, the concrete pad, fencing, gas piping and site work may need their own permits or reviews. Our guide to the buildout permit process in Houston explains how commercial plan review generally works.
Choose the fuel
- Natural gas: No fuel deliveries are needed, but the gas service must be able to supply the generator, so the gas utility should be involved early.
- Diesel: Fuel is stored on site, which means tank sizing, refueling plans and fuel maintenance.
- Bi-fuel or other options: Some systems can use more than one fuel source.
Ask your engineer to compare how long each option can run, what it takes to keep fuel available during a storm and what maintenance each needs.
Pick a safe location
Location matters as much as size:
- Flood risk: Keep the generator, transfer switches and fuel equipment above expected flood levels. Check the site using the Harris County Flood Control District's interactive mapping tools.
- Exhaust: Keep exhaust away from windows, doors and air intakes. Carbon monoxide from generators is a serious hazard, and Ready.gov reminds people never to run generators inside buildings or garages.
- Noise: Consider neighbors, residents and tenants, especially during testing.
- Access: Leave room for service, fuel deliveries and future replacement.
- Security: Protect the unit with fencing or an enclosure.
- Structure: Ground pads need proper concrete; rooftop units need structural review.
Transfer switches and the electrical system
The transfer switch is what moves the building from utility power to generator power. Your engineer will decide whether you need automatic or manual switching, how many switches are needed and how they connect to existing panels. Older buildings may need electrical upgrades to make that connection safely. Our guide to commercial electrical service upgrade planning covers capacity reviews and utility coordination with CenterPoint Energy.
Multifamily considerations
Apartment owners often focus on:
- Elevators in mid-rise buildings
- Fire alarm and emergency lighting
- Water pressure pumps in taller buildings
- Lift stations or sump pumps
- A clubhouse or leasing office where residents can charge phones and get information
Communicate clearly with residents about what the generator will and will not power so expectations are realistic during an outage.
Pair it with storm planning
A generator works best as part of a broader storm plan. Our guides to hurricane prep for rental properties and freeze prep for Houston rental properties cover the other steps owners take before and after severe weather.
Testing and maintenance
A generator that has not been tested may not start when needed. Plan for:
- Regular test runs under load
- Scheduled maintenance by a qualified service company
- Fuel checks and treatment for diesel systems
- Battery and charger inspections
- A written log of tests and service
Assign someone on the property team to own the schedule and keep records.
Questions to ask bidders
- What loads did you size the generator for?
- Where will the unit sit, and how is it protected from flooding?
- What electrical work is needed to connect it?
- What permits and inspections are included?
- What is the delivery lead time for the equipment?
- What does the maintenance agreement cover?
Quick checklist
- List what must run during an outage
- Hire an electrical engineer to size the system
- Choose the fuel and confirm supply
- Pick a location above flood risk with safe exhaust
- Plan transfer switches and electrical upgrades
- Confirm permits and inspections
- Communicate with tenants or residents
- Set up testing and maintenance
Planning a generator pad, enclosure or electrical upgrade at your property? BPC Development LLC provides free on-site estimates in Houston, TX. Call (281) 301-4737.