Stationary Generator | 500kW | Gaseous | 25.8L


Stationary Generator | 500kW | Gaseous | 25.8L

Uninterrupted Power. Industrial Strength.
The Generac 25.8 L 500 kW gaseous generator delivers proven reliability and long-lasting performance for industrial and commercial operations that can’t afford downtime. Designed for continuous operation and extended runtimes, this unit provides cost-effective, low-emission power for standby, prime, or demand-response applications—all backed by Generac’s vertically integrated design and manufacturing expertise.
 

Features & Benefits

Purpose-Built Spark-Ignited Engine: Generac’s 25.8 L V12 engine is engineered specifically for natural gas applications, with turbocharged and aftercooled performance for high power output, fuel efficiency, and long service life.
 
POWER ZONE® Pro Sync Controller: Advanced 7-inch color touchscreen controller provides NFPA 110 Level 1 compliance, full system visibility, remote connectivity, and integrated paralleling for multi-unit synchronization.
 
Modular Power System (MPS) Paralleling: Easily expand capacity and redundancy with Generac’s MPS architecture—offering up to 99.999% reliability and scalable load-sharing flexibility.
 
Industrial-Grade Alternator: Brushless, permanent-magnet excitation design with Class H insulation and <5% THD ensures clean, stable power for sensitive equipment.
 
Engineered Enclosures: Generac-built steel or aluminum enclosures offer corrosion resistance, weather protection, and multi-level sound attenuation options for quiet, durable operation.
 
Fully Integrated System Design: Every component—from engine and alternator to controls and enclosure—is designed, built, and tested in-house, ensuring seamless compatibility and single-source accountability.

Performance

Sound Levels/Enclosures: Open and Weather-Protected Level 1, 2 and 3 Sound-Attenuated Enclosures for the highest degree of noise reduction available.
 
Cooling System: Pressurized Closed-Loop with 50/50 Ethylene Glycol for reliability in all climates and reduced maintenance.
 
Construction: Steel or aluminum with RhinoCoat™ powder-coated finish protects against rust, UV and weather for long-term durability

Product Snapshot

Ideal For: Large commercial buildings, manufacturing plants, healthcare facilities, and mission-critical operations.
 
Applications: Standby, prime, and demand-response power where long runtimes and low maintenance are essential.
 
Footprint: Approx. 207–247 in L × 71 in W × 80–129 in H (depending on enclosure)
 
Operating Temperature: Up to 122°F (50°C) before derate
 
Certifications: EPA Certified Stationary Emergency & Non-Emergency, UL2200, NFPA 110 Level 1 Compliant

Specifications

Units:
Fuel Type: Gaseous
Engine: Generac
Engine Type: 12-cyl V12
Engine Size (Liters): 25.8
Engine Output (kW): 500
Running Watts (W): 500,000
kW/kVA Prime: 500/625
Engine Manufacturer: Generac
Open Set Footprint - L x W x H: inches (millimeters): 154.4 (3,922) x 70.5 (1,791) x 74.9 (1,902)
Enclosed Footprint - L x W x H: inches (millimeters): 207.4 (5,268) x 70.9 (1,801) x 114.1 (2,898)
Controller Type: Power Zone Pro Sync
Weight (kg): 4,257
Weight (lb): 9,386
Enclosure: Steel or Aluminum
Steel (kg): 5,860
Steel (lb): 12,921
Aluminum (kg): 5,019
Aluminum (lb): 11,565
HZ: 60
Emissions Compliance: EPA Certified Emergency & Non-Emergency