APPROVED SUPPLIER
Power Grid Corporation of India
Marsons is an approved supplier to PGCIL, India’s central transmission utility. Approval involves design evidence, type testing, factory assessment and delivery performance.
TRANSFORMERS FOR NORTH AMERICA
Shorter lead times.
70 years of manufacturing.
Hilltop Grid Solutions brings Marsons’ seven decades of manufacturing to the U.S. and Canada. With 12,000 MVA of annual capacity, expanding to 26,000 MVA, we offer direct factory access and a coordinated path from engineering to delivery.
Lead time is confirmed for each order in the quotation.
12,000 MVA
Annual manufacturing capacity
26,000 MVA
Capacity expansion underway
10 kVA–300 MVA
Distribution through large power
345 kV
Highest voltage class offered
LEAD TIMES & CAPACITY
More capacity.
A shorter order path.
Solar, storage, data centers and grid renewal are putting pressure on transformer supply. Hilltop connects North American buyers directly with Marsons’ expanding production capacity.
Engineering, procurement, manufacturing and logistics are coordinated from the outset. Work proceeds in parallel where possible, and testing takes place at the factory.
Discuss availability and delivery- Engineering and procurement in parallel
- U.S.-format drawings and guaranteed technical particulars are issued early, so approvals can progress while materials are ordered.
- One integrated works, one schedule
- Design, core production, windings, tanks, assembly and testing are brought together at the Kolkata works.
- In-house testing
- Routine and impulse tests run in Marsons’ NABL-accredited laboratory, without an outside laboratory queue.
- Freight planned with production
- Shipping is booked against the manufacturing schedule, with nitrogen-filled transport and impact recording to a U.S. East, Gulf or West Coast port.
MARSONS LIMITED
70 years of building transformers.
Marsons has manufactured power transformers in Kolkata for seven decades, supplying utilities and power producers on critical circuits. It is Eastern India’s largest extra-high-voltage transformer manufacturer by installed capacity.
Hilltop brings that manufacturing base to North America through a joint venture with Cleanhill Partners: one accountable team from quotation through commissioning, with a direct connection to the factory.
45,000 m² Integrated works in Kolkata
200 MT Overhead crane capacity
BSE & NSE Publicly listed manufacturer
Approvals and testing credentials
Established quality systems behind every order.
APPROVED SUPPLIER
NTPC Limited
Marsons is an approved supplier to India’s largest power generating company, meeting its requirements for transformer designs and quality systems.
NABL-ACCREDITED LABORATORY
Testing at the works
An on-site laboratory assessed against ISO/IEC 17025, with a 1,600 kV / 80 kJ impulse generator. Units ship with certified test reports; witness testing in Kolkata is welcome.
Management systemsISO 9001 · QualityISO 14001 · EnvironmentISO 45001 · Occupational health & safety
SUPPLY CHAIN & SERVICE
Global manufacturing.
Local service.
Built in Kolkata, with documents, delivery and project support organized for the North American buyer.
- 01
Kolkata works
Design, manufacture and testing under one roof.
- 02
Ocean freight
Nitrogen-filled, impact-recorded transport to an East, Gulf or West Coast port.
- 03
Site delivery
Heavy-haul road or rail transport, with permits arranged for the site.
- 04
Site support
Installation supervision, commissioning and after-sales support.
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U.S. project locations in execution
Alabama, California, Texas, Virginia and Michigan.
Orders range from pad-mounted units to 200 MVA.
- Documents in U.S. format
- Submittals, drawings, nameplates and test reports in U.S. practice and units.
- U.S. sales and project engineering TEAM IN DEVELOPMENT
- A local team working in your time zone and to your standards.
- Local spares and service PLANNED
- U.S. stock of bushings and common accessories, with local repair and service capability to follow.
PRODUCT RANGE
10 kVA to 300 MVA.
Eleven product families on one engineering platform, from pole-mounted distribution to large substation and generator step-up transformers.
| Product family | Rating | Typical application |
|---|---|---|
| Overhead distribution | 10–500 kVA | Pole-mounted utility distribution |
| Pad-mounted, single-phase | 10–167 kVA | Residential and commercial underground distribution |
| Pad-mounted, three-phase | 75–5,000 kVA | Commercial, industrial and utility; options to 10 MVA |
| Solar and storage | 1–25 MVA | Inverter-duty units for PV and battery plants |
| Wind turbine step-up | 1–6.3 MVA | Turbine and collector systems |
| Station service and grounding | 10 kVA–1 MVA | Substation auxiliaries; options to 10 MVA |
| Rectifier, furnace and traction | 1–50 MVA | Industrial and rail duty |
| Substation power | 5–300 MVA | Transmission and sub-transmission, 69–345 kV |
| Generator step-up | 1–300 MVA | Power plants, 34.5–345 kV |
| Phase-shifting | 50–300 MVA | Power flow control, 115–345 kV |
| Mobile substations | 5–100 MVA | Rapid restoration, 34.5–230 kV |
U.S. standards from the first drawing
IEEE C57 design and testing, DOE efficiency requirements, NEMA sound limits, and U.S.-format drawings and reports. UL-listed options are available.
IEEE C57 · DOE 10 CFR 431 · NEMA TR 1 · UL-listed options
Detailed specifications for each family
Request ratings, technical data, features, options, tests, standards and full-load currents for your application.
Request a specification sheetTHE JOINT VENTURE
Marsons Limited &
Cleanhill Partners
Hilltop Grid Solutions combines Marsons’ transformer engineering and manufacturing with Cleanhill Partners’ North American commercial relationships, financing relationships and experience building energy businesses.
Based in New York, Cleanhill supports customer development and the build-out of U.S. operations and service.
Read the joint venture announcementQUOTATIONS & TECHNICAL INQUIRIES
Tell us what your project needs.
Send the required rating, voltage, application, delivery location and target date. We’ll discuss the specification, production availability and delivery schedule.