GTC set the standard in helping companies keep their GE controls, and we are proud to remain the global leader in supporting classic GE systems.

We invested in one of the world’s largest inventory of in-stock circuit boards and other GE components, which are no longer available from the OEM. All of our parts undergo functional testing to ensure the part you receive is ready for service when you need it most.

In today’s economic period of reducing costs, GTC can save you money on remanufactured products and repairs instead of costly new parts from the OEM. In addition, we have the quality to back-up our products with an exceptional warranty program.

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GTC supplies all major components of GE panels, including:


GTC is globally recognized amongst Operators as being a high quality Repair Facility for GE Mark Systems.

With an official record of less than 1% in Warranty Returns, from equipment functions and field operations, to component levels of circuit boards, GTC has the expertise to keep your plant running. Operating for over 20 years, having completed over 7,000 repairs for numerous clients spanning from GE Turbine and Excitation to LCI Controls, GTC is the most experienced Repair Facility (outside of the OEM), which makes us a reliable and trusted partner to repair your parts.


We offer clients the choice to use newer, upgraded Power Supply Cards which offers better power distribution and stability for your panel. The noise projected by the OEM TCPS card is no longer a feature with our new (aftermarket) GTC-TCPS card. Ask your GTC Sales Representative for specific details and data.

The OEM says your equipment is “obsolete” – GTC calls it “Classic”, with the ability to operate safely and reliably for as long as you need. We developed a direct replacement that consists of the same fit, form and function as the original, but with the added benefit of upgraded components. We offer clients both options to buy the original OEM or the GTC direct replacement. Ask your GTC Sales Representative for specific details and data.


Where possible, GTC offers a choice to End Users of Unused or Remanufactured parts. However, we highly recommend to our customers the Remanufactured condition for its renewed lease of life. Having new components installed on an original board, replacing original components that may have decayed over time with upgraded new parts, strengthens its quality and reliability. A numerous amount of Remanufactured cards have been sold and serviced by GTC, our experience being second to none, with regular clientele spanning across 90 countries.


We offer a full range of services onsite or offsite for the GE Mark II, Mark IV, Mark V, Mark VI, Mark VIe, MarkVIeS, EX2000, EX2100, and LS2100. To learn more, click here.

A brief summary of services:

Health Checks
Eprom Backup Service
Outage Support
TIL Implementation
NERC Testing & Reporting


GTC offers various training programs for Operators and Engineers at any technical level. Onsite or offsite classroom based training is available for all systems. We use our portable emulators for MKV, MKVI and MKVIe specific controls, which incorporates site data. For more information, click here.


GTC’s Longevity™ Program provides the End User with stability and reassurance that they can continue to use their systems which has been obsoleted by the OEM. GTC considers any control obsoleted by the OEM as a current system, or as we like to describe it, a “Classic” system which we support through our vast inventory, system knowledge and Field Engineer experience.
Whether you are deciding between keeping your existing controls, upgrading, or your plant has limited life operation time which does not permit desired upgrading, we can provide a custom solution for you. This can reduce substantial investment in capital expenditures from a few years, to 20.

Please contact your GTC Sales Representative for further discussion as each plan is a customized solution to suit site requirements.


GTC continuously buys surplus and disused GE Turbine and Excitation controls, as well as faulty cards. We invest in excess of over 2 million USD annually to keep inventory available to Operators who can no longer buy from the OEM or choose not to buy from them. With the many hours we put into each and every part we purchase to remanufacture and test, buyers are always guaranteed to receive the highest quality parts which are considered to function as good as, or in some cases, better than new, as improved components are used where possible.

Next time you upgrade your system, part of your system, or have faulty cards you wish to dispose of, connect with a GTC Representative and we will give our evaluation and offer.

GE ceased support of these systems to pressure users into an expensive upgrade. Fortunately, GTC has a full stock of new, old, and remanufactured cards and parts available 24/7.

  • All cards and spare parts come with a 12 to 36-month warranty, and we offer our customers an optional exchange program
  • Repairs completed in our in-house, state-of-the-art facility are functionally tested to ensure reliability
  • Field services, including troubleshooting and commissioning are available

GTC also seeks out surplus panels, core upgrades and unwanted spares as part of our Asset Recovery service, helping us to keep costs low.

GE has been the top name in turbine control systems since the 1960’s. Known for their reliability and low failure rate, many early units are still in use in more than half a century after entering the market despite GE no longer supporting them.

To ensure these classic systems remain in operation, GTC offers support for all generations Mark I, Mark II, Mark III, Mark IV, Mark V, Mark Ve, Mark VI and Mark VIe controls.

Talk to us about:

  • Unused and Remanufactured spare parts
  • Repair with functional testing
  • Field services, including troubleshooting, outage and startup support, alarm clearing, calibration, health checks and more
  • On-site training or at our Training Facility


Our Mark components carry a 24-month warranty and may be eligible for our EXTEND™ warranty program. The remanufactured products carry a 36-month warranty.

Our large inventory includes a wide selection of Unused and Remanufactured spares for GE’s EX2000, EX2100 and EX2100e Excitation Systems, each carrying a 12 to 36-month warranty.

GE’s Digital Generator Protection (DGP) provides monitoring, control and other functions for AC generators and is preferred by many customers thanks to its dependability and security. GE discontinued the DGP in 2010, however, GTC retains an extensive inventory of DGP parts for the benefit of our customers.

Our inventory includes both unused and remanufactured:

  • Power Supply Modules (PS1 & PS2)
  • Digital Input and Target Modules (DIT)
  • Magnetic Modules (MGM)
  • Man Machine Interface Module (MMI)
  • System Process Modules (SSP)
  • Analog Interface Modules (ANI)
  • Data Acquisition Modules (DAP)
  • Digital Signal Processor Modules (DSP)
  • Test Blocks

Innovation, LS2100 and LS2100e (similar to Excitation controls)

GE has supplied Brushless Excitation Systems for aero-derivative, frame gas, and steam turbines for more than 35 years. Many prefer Brushless Systems because they eliminate brush maintenance and self-exciting PMG-sourced systems; however, aging analog voltage regulators continue to exhibit the operational reliability and parts availability issues, common in vintage systems. 

Many also have the capability to add the PSS functions being driven in today’s changing regulatory environment.

GTC allows customers who prefer Brushless Excitation Systems to continue to utilize them longer. We use energized panels for functional testing for added reliability.

Our field services for Brushless Excitation Systems include:

  • On-site and remote troubleshooting
  • Commissioning
  • Outage support
  • NERC compliance support
  • Health checks

GTC is proud to be associated with the following trade associations:

As the performance-tested controls pioneer, GTC promises to deliver unrivaled value powered by industrial-strength service.

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North America

6 Skyline Drive, Suite 150
Hawthorne, NY 10532

Tel: (+1) 914 693 0830
Fax: (+1) 914 693 3824

Europe & Africa

Jhumat House, 160 London Road
Barking, London IG11 8BB
United Kingdom

Tel: +1 914 693 0830 Ext 301

Asia & Australia

Axis Tower Level 3
No. 2, Jalan 51A/223 Seksyen 51A
46100 Petaling Jaya
Selangor, Malaysia

Latin America

Buenos Aires, Argentina

Tel: +1 914 693 0830 Ext 402
or +54 11 6091 3507

South Asia

#541, 1st Floor, MCECHS Layout
9th Cross, 80 Feet Road
Jakkur, Bangalore
India – 560077

Tel: +91 (0) 80-29731666
Fax: +91 (0) 80-29731631

Middle East

1A-01 LIU
Dubai Silicon Oasis
United Arab Emirates

Tel: +1 914 693 0830 Ext 505
or +971 (0) 4 320 3457

Emergency Service

If a part is needed urgently, our dedicated team will mobilize at any hour of the day to get your plant back online in the shortest time possible.

USA & Canada: +1-844-482-3278

International: +1-914-693-0786

On-call 24 Hours a Day, 7 Days a Week, Worldwide Support



Professional Opportunities in the Power Industry

Our dedicated team includes engineers, technicians, customer service representatives and other valuable employees. To inquire about our available positions, please contact us.