Up to 100 MVA, 230 kV
Substation Transformers
Power any project with our in-stock units
or made-to-order equipment.
Excellence Starts Here
- Immediate Availability
- Fully Customizable
- IEEE/ANSI C57.1
- Small- & Large-Scale Orders
- Free Shipping*Contiguous 48 United States
The Choice Is Yours
Discover the price range, lead time, and transformer configuration that best suits your team’s needs. We'll provide a quote for each solution to help get you started.
IN STOCK
Immediate
Solutions
We have 100+ customizable substation transformers—up to 100 MVA, 230 kV—in stock and ready to ship.
MADE-TO-ORDER
Specialty
Equipment
Receive the exact substation transformer you need—up to 25 MVA, 45 kV—in 16 weeks delivered (or 20 weeks, standard lead time).
The CORE Difference
We’re consistently leading the charge with the most cost-effective, high-quality transformer solutions, built and delivered in record time.
CORE Substation
The Competition
PRICE
LEAD TIME
QUALITY
 | |
|---|---|
Features | Three-Phase Substation |
 Size & Voltage | Up to 100 MVA, 230 kV |
 BIL Rating | Up to 550 kV |
 Cooling Classes | ONAN/ONAF Mineral Oil KNAN/KNAF (FR3 Natural Ester) Future Fans |
 Winding Configurations | Δ (Delta) Y (Wye) GrdY (Grounded Wye) Multi-Voltage |
 Core Materials | Laminated Silicon Steel Amorphous Steel |
 Coil Material | Aluminum Copper |
 Temperature Classes | 55°C 65°C 75°C |
 Features | Infra-red (IR) Window External Drain & Sample Pressure Relief Valve (PRV) Pressure Release Device (PRD) Sudden Pressure Sensor Motorized LBOR |
 Accessories | Liquid Temperature Gauge Liquid Level Gauge Gauges w/ Contact LBOR w/ Contacts Winding Temperature Gauge Kirk Key Provision Through-Tank Window |
 Build & Test Standards | IEEE/ANSI C57.12 |
 Certifications | UL, cUL, DOE2016 |
Shipping & Availability
New (In Stock) | New (Custom) | ProCORE | Remanufactured | Rental |
|---|---|---|---|---|
Stock StatusIn Stock | Stock StatusMade-To-Order (MTO) | Stock StatusIn Stock | Stock StatusRemanufactured-To-Order | Stock StatusIn Stock |
Lead TimeReady to Ship | Lead Time20 Weeks Delivered (16 Weeks Expedited) | Lead TimeReady to Ship | Lead Time4 Weeks (Rush Available) | Lead TimeReady to Ship |
Standard Warranty2 Years (Extended up to 5 Years) | Standard Warranty2 Years (Extended up to 5 Years) | Standard Warranty3 Years (Extended up to 5 Years) | Standard Warranty3 Years (Extended up to 5 Years) | – |
Customizable Substation Transformers
We can match your exact specifications. Get made-to-order (MTO) substation transformers in just 20 weeks, or 16 weeks expedited.
Questions?
We Have Answers.
What does the warranty cover? 
If you didn’t get what you expected, we’ll make it right. Now, if you decided to wire the transformer backwards or drop it off the side of a truck, that would not be covered in the warranty—but we would still see what we could do to help. For all the fine-print that will keep your attorney busy, see the Warranty Details on our Terms & Conditions page.
Can I purchase an extended warranty?
Yes, you can purchase an extended warranty for 2% per year, with a maximum warranty of up to 5 years total.
Can CORE repair my existing transformer?
Absolutely. Check out our for a full process breakdown. We can complete most jobs within just a few days or weeks, depending on the complexity of the repair.
Can CORE modify my existing transformer?
It would be our pleasure. We frequently modify our stock units and customize our customers’ units to suit specific projects, even on tight deadlines. Check out our for more details.
Does CORE sell spare parts?
Sometimes, the easiest way for us to help you means selling a bushing, gasket, part, or piece to keep your project moving. And while we’re not technically in the business of selling parts, we’ll always see what we can do to help our existing customers.
Does CORE ship internationally?
We do, and we’d be happy to help coordinate an international shipment. Or, we can facilitate a delivery to your local freight forwarder.
Are emergency and holiday shipments available?
Our normal office hours follow most holidays, but our team is available 24/7/365 for customer emergencies. Please note that orders that have been taken or shipped after hours, on weekends, or on holidays, though, will incur additional emergency fees.
Can I have the transformer painted a different color?
As long as it’s not USC Gamecock Garnet Red (Go Tigers!), we should be able to accommodate. You can talk to one of our sales associates for more info.
Does the free shipping include a dedicated truck?
Our free shipping does not include a dedicated truck. Most transformers are quoted with free delivery anywhere in the lower 48 states, with a few exceptions for extra-large specialty units. These are not dedicated loads, but frequently ship within 24–72 hours of the order receipt.
Can I arrange my own pick-up or drop-off?
Absolutely. Most of our orders include free freight anywhere in the lower 48 states, however, you are welcome to arrange your own freight and our team will happily load your truck at no extra cost.
Can specific labels be applied to the unit?
Not a problem. Just be sure to coordinate with your sales associate when placing your order.
Are CORE transformers® autobots or decepticons?
If they ever start talking or walking, please submit a warranty claim. For now, they’re 100% focused on uptime and reliability.
What kind of equipment is needed to offload the transformer?
Most substation transformers are loaded onto 6x6 or 8x8 timber and are secured onto a flatbed truck. We typically recommend using slings on a forklift to lift the transformer from the lifting eyes, although you could potentially lift it from below, instead. Contact our team with any questions and we’ll confirm the specific arrangement you’ll need.
Can CORE build to custom dimensions?
Yes, we can! We’ve even been known to fly across the country to get measurements on-site, ensuring the perfect form fit and function, especially for equipment that needs to close-couple HV or LV gear on either side. Your sales associate can answer any questions you have about custom work.
Does CORE offer commissioning services for large units?
We leave the commissioning and field-service to our valuable partners. Give us a call for a recommended company in your area.
Can I buy extra oil from CORE?
Our goal is to be easy to do business with, and sometimes that means shipping a few totes of mineral, silicone, or FR3 oil. Give your sales associate a call to discuss your options.
Industries We Support
Commercial
Reliable energy distribution for retail, offices, and commercial campuses.
Industrial
Engineered to meet the demands of heavy-duty industrial operations.
Learn More
Renewables
Seamless integration for solar, wind, and other renewable energy systems.
Learn More
Data Centers & Critical Power
High-performance power solutions for data, tech, and mission-critical loads.
Learn MoreCustomers We Serve
Electrical Contractors
From installations to repairs, we’ll support you with the highest-quality transformer solutions.
Electrical Distributors
Partnering with you in all-things-transformers, so that your clients never have to wait.
NETA / Field Service
When you run into trouble in the field, we’re the number you want to have on speed dial.
Operations & Maintenance
We’re available to assist your team 24/7/365 to ensure your division runs smoothly.