Field Services

AP4 Services (formerly TC&E) 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 10 years, as a trusted partner to many third-party equipment providers to properly install and commission their equipment onto gas and steam turbines. AP4 Services' 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.

The company’s field service team, AP4 Services, provide comprehensive field maintenance services on both aeroderivative and heavy-duty gas turbines.  Our OEM trained field service engineers specialize in turbine, generator and steam turbine controls, excitation and mechanical field services.  AP4 supports the worldwide power generation, oil & gas, and marine industries.

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

Power plant personnel look to AP4 Services when they are seeking a trusted non-OEM service provider that can help them develop and implement customized controls system projects. AP4 Services 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 controls upgrades will meet the plant’s long-term operating strategy.


Expert Powerplant Support

AP4 Services is focused on the ever-changing needs of our customers. It is our mission to provide the highest quality Field Engineers with the correct skill set to support our customers’ requests.

Controls & Instrumentation

AP4 Services provides expert support in all GE™ Turbine Control Systems, Excitation, and LCI Static Starters. We also have a wide range of knowledge of other platforms including but not limited to Instrumentation, PLC, Protection Relays, BOP and Mechanical systems.

Mechanical Field Services

In today’s changing power market, the reliability of starting your Gas Turbine is now more important than ever. Every Summer and Winter AP4 Services answers multiple Forced Outage Calls to repair issues. It is our mission to help our customers keep these systems 100% reliable.



Using the latest technology, components, and lessons learned through decades of experience, AP4 Energy 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.