• Standby power

  → Activates during utility outages

  → Most common for commercial buildings

  → Example: Office or retail space maintaining operations during outages

  
  

• Emergency power

  → Required for life-safety systems (hospitals, fire systems, etc.)

  → Must meet strict code and response requirements

  → Example: Powering egress lighting, alarms, and critical care systems

  
  

• Prime power

  → Used when utility power is unavailable or unreliable

  → Designed for continuous or extended use

  → Example: Remote operations or industrial sites

  
  

  Choosing the right type depends on your risk tolerance, compliance requirements, and operational needs.

It depends on runtime expectations and infrastructure.

• Natural Gas

  → Continuous supply, minimal refueling

  → Ideal for urban or connected sites

  → Example: Office buildings that need uninterrupted operation during extended outages

  
  

• Diesel

  → High power output and reliability

  → Common for larger systems and emergency applications

  → Example: Healthcare or industrial facilities with dedicated fuel storage

  
  

• Propane

  → Flexible and clean-burning

  → Used where gas lines aren’t available

  → Example: Commercial properties in rural or developing areas

  
  

The right choice depends on availability, load requirements, and how long you need to operate.

Runtime depends on fuel type and load demand.

• Natural gas systems

  → Can run continuously as long as supply is active

  
  

• Diesel systems

  → Example: A 250kW generator may consume ~15–20 gallons/hour at load

  → A 1,000-gallon tank could provide multiple days of runtime depending on usage

  
  

• Propane systems

  → Dependent on tank size and load, similar considerations to diesel

  
  

Higher load = higher consumption. Proper planning ensures you meet required runtime.

Yes—but only if the system is designed for it.

Example scenarios:

• A single-generator system may support critical systems while shedding non-essential loads

• A parallel generator system can support full-building load across multiple units

• A load-managed system can prioritize systems dynamically based on demand

Most commercial environments use a hybrid approach, balancing full coverage with intelligent load management.

Undersized systems don’t fail immediately—but they create operational issues.

Real-world example:

• HVAC startup causes voltage drop → other systems lag or shut off

• Equipment cycles unpredictably due to load limits

• Critical systems compete for power during peak demand

Proper system design prevents this by accounting for startup loads, sequencing, and peak demand conditions.

Yes. Most commercial systems use automatic transfer switches (ATS).

Example:

• Utility power fails

• Generator starts within seconds

• System transfers load automatically

• Power is restored to critical systems without manual action

For critical environments, transfer time and reliability are engineered to meet operational requirements.