Data Center Generator & Standby Power SystemsGenerator Systems
Southern Electrical Services installs complete standby and prime generator systems for data centers across Texas — from single unit automatic transfer switching to multi-megawatt paralleling switchgear configurations serving hyperscale AI facilities.
What Generator Electrical Work Is Required for a Data Center?
Data center standby generators provide backup power when utility power fails — essential for any facility where downtime is not acceptable. The electrical work includes generator power wiring, automatic transfer switches (ATS) or static transfer switches (STS), paralleling switchgear for multi-generator configurations, fuel system controls, and integration with UPS systems and building management platforms. Southern Electrical Services installs and commissions all generator electrical systems as prime contractor throughout Texas, from 100kW diesel units to 5MW+ paralleling configurations.
Generator System Electrical Services
Generator Installation & Power Wiring
Complete electrical installation for diesel and natural gas standby generators from 100kW through 5MW+ per unit. Work includes feeder cable and conduit from generator to switchgear, neutral grounding resistors, generator overcurrent protection, and termination at the main switchboard or paralleling switchgear. We work with generators from Caterpillar, Cummins, Kohler, MTU, and all major manufacturers.
Automatic Transfer Switches (ATS)
ATS installation and wiring for single-generator configurations — open transition, closed transition, and soft-load transfer switch types. Data center ATSs are typically rated 800A–4000A at 480V 3-phase. We install, program, and test all transfer switch types, including bypass-isolation ATSs that allow maintenance without load interruption.
Static Transfer Switches (STS)
High-speed static transfer switch installation for critical data center loads requiring sub-cycle transfer times (less than 4 milliseconds). STS units protect servers and networking equipment from the brief power interruptions that mechanical ATSs cannot prevent. We install STS units from Eaton, ABB, and Schneider Electric rated from 100A through 3000A.
Paralleling Switchgear
Design and installation of generator paralleling switchgear allowing multiple generators to operate simultaneously and share load. A 10MW data center may deploy 6–10 generators of 1–2MW each paralleled through a common bus, providing N+1 or 2N redundancy. Paralleling gear includes synchronization controls, real and reactive load sharing, protective relaying, and utility transfer logic.
Generator Fuel System Controls
Control wiring for diesel fuel systems — day tanks, bulk storage tanks, fuel transfer pumps, level sensors, and leak detection. Natural gas generator installations include gas train wiring, pressure monitoring, and interlock controls. We coordinate fuel system electrical with mechanical contractors and fuel system vendors.
Load Bank Testing & Commissioning
Full-load testing using resistive and reactive load banks to verify generator performance at rated capacity before going live. We perform step-loading tests, full-load runtime tests, and transfer switch timing tests. All results are documented in commissioning reports required by Tier III and Tier IV certification processes.
Generator-UPS Integration
Wiring and controls coordination between generator systems and UPS systems to ensure seamless ride-through during generator start and transfer. Includes UPS input contactor controls, generator-to-bus synchronization, and integration with the facility DCIM or BMS platform. Proper generator-UPS coordination prevents UPS trips during load transfer events.
Frequently Asked Questions
How much generator capacity does a data center need?
Data center generator capacity must cover the full facility electrical load plus a design margin. Industry practice is to size generators for 100% of IT load plus 30–40% for cooling and mechanical loads, with N+1 redundancy meaning one additional generator unit beyond what is needed to carry the full load. A 10MW IT load facility typically installs 16–20MW of generator capacity in an N+1 configuration using multiple paralleled units.
What is the difference between an ATS and an STS?
An Automatic Transfer Switch (ATS) is a mechanical device that transfers load from utility to generator in 2–5 seconds. A Static Transfer Switch (STS) uses solid-state electronics to transfer in less than 4 milliseconds — faster than most UPS systems can bridge. For data center IT loads protected by UPS systems, an ATS is typically sufficient. For sensitive loads without UPS protection, an STS is required. Southern Electrical Services installs both types depending on the load requirements and Tier level.
What is paralleling switchgear and why is it used in large data centers?
Paralleling switchgear allows multiple generators to operate simultaneously on a common bus, sharing load proportionally. This provides several advantages: it allows using multiple smaller generators rather than one large unit (easier procurement, faster delivery, simpler maintenance), it enables N+1 redundancy (if one generator fails, others carry the load), and it allows generators to be brought online incrementally as load grows. Large data centers and hyperscale AI facilities almost universally use paralleling switchgear with 4–12 generator units.
How often should data center generators be tested?
NFPA 110 requires monthly no-load tests and annual full-load tests for emergency generators. Most data center operators test generators monthly under partial load and quarterly or annually under full load using load banks. Transfer switch timing is verified at each test. Southern Electrical Services performs load bank testing and commissioning as part of our generator electrical scope, and can provide ongoing testing and maintenance services.
Can Southern Electrical Services work on generator projects throughout Texas?
Yes. Southern Electrical Services operates as prime electrical contractor on generator projects statewide — including Houston, Dallas-Fort Worth, Austin, San Antonio, West Texas, and all areas in between. We have experience with large-scale generator installations for industrial facilities, hospitals, and data centers throughout Texas, and manage all electrical permitting, utility coordination, and inspection.
Generator Work We Do
- Diesel generators (100kW–5MW+)
- Natural gas generators
- Automatic transfer switches (ATS)
- Bypass-isolation ATSs
- Static transfer switches (STS)
- Paralleling switchgear
- Generator feeder wiring
- Fuel system controls
- Load bank testing
- Generator-UPS integration
- BMS / DCIM integration
- NFPA 110 compliance
Generator Systems for Your Texas Data Center
From single-unit ATS installations to multi-megawatt paralleling switchgear — Southern Electrical Services installs and commissions all generator electrical systems as prime contractor throughout Texas.