AP4 Group – Full-Service Heavy-Duty & Aeroderivative Industrial Gas Turbine Maintenance Provider.

About TC&E - A Division of AP4 Group

Turbine Controls & Excitation Group (TC&E) - A Division of AP4 Group was established in 2009. TC&E is a global full-service power generation controls company specializing in gas turbine, steam turbine, and generator control systems.

TC&E - A Division of AP4 Group's Field Engineers are OEM trained turbine startup and commissioning engineers with 20, 30, even 40+ years of experience in the power industry. As startup engineers, we understand how all of the systems work together in your turbine generator set. When a TC&E Field Engineer is on-site you can feel confident in our ability to perform.

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Field Service Solutions

TC&E, a division of AP4 Group, is a premier field engineering service company specializing in Controls, Exciter, and LCI systems on Large Frame GE™ Gas and Steam Turbines.  We have built a reputation during the past 12 years, as a trusted partner to many third-party equipment providers to properly install and commission their equipment onto gas and steam turbines.  TC&E’s expertise in turbine controls and plant operations, along with our ability to work on a wide variety of OEM and non-OEM systems makes us uniquely qualified to help our customers customize their equipment to meet their needs.

Such customization projects include:

  • TMEIC™ LCI DFE Upgrade
  • TMEIC™ LCI Full Replacement Project
  • Basler™ EX DFE Upgrade
  • Basler™ EX Full Replacement Project
  • Young & Franklin Electric Gas Valve and IGV Replacement Project
  • Emerson™ Ovation Control System Rip & Replace Upgrade
  • Alta Solutions™ CDMS Installation
  • Parasitic Load Upgrades

Power plant personnel look to TC&E when they are seeking a trusted non-OEM service provider that can help them develop and implement customized control system projects.  TC&E is committed to helping our customers make highly informed equipment upgrade decisions, whether it involves an OEM or non-OEM system.  Our goal is to ensure your control upgrades will meet the plant’s long-term operating strategy.

Our Solutions

TC&E specializes in controls, excitation, and LCI systems on GE™ heavy-duty gas and steam turbines. These services include a wide variety of controls maintenance, troubleshooting, and system upgrades. Our OEM-trained field engineers are here to ensure your equipment operations are reliable and efficient.

Power plant personnel look to TC&E when they are seeking a trusted non-OEM service provider that can help develop and implement customized control system projects. We are a trusted installation partner for many non-OEM equipment vendors throughout the industry.

From basic troubleshooting to DLE Mapping and mechanical service and maintenance, AP4 Power Services can meet all of your aeroderivative needs. Our expert team of Controls & Mechanical Field Engineers is ready and able to provide the on-site support you require.

Industry Benefits


Using the latest technology, components, and lessons learned through decades of experience, AP4 Power Services can ensure complete reliability for both start-up and continuous operation.


This is the key to success in today’s competitive power markets. Heat Rate, Capacity, Start-Up, and Maintenance Costs are critical to the success of aging power plants.


Spending good money where it makes the most difference! We understand that O&M budgets are shrinking, so we work with the plants to understand where and when to repair, replace, or upgrade for maximum return.


Aging systems can continue to provide reliable service for many years to come with the proper service, maintenance, and repairs. Push your upgrades out 5-10 years with confidence.