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

Owners Engineer

The OEM’s are pushing every plant to upgrade to their latest greatest technology. Not every plant needs to upgrade as urgently as is being stressed by the OEM’s. OEM’s make money selling upgraded systems. The OEM Sales Teams work on commission and will say or promise almost anything to get you to upgrade to their newest technology.

TC&E is dedicated to helping owners understand the who, what, when and why! We are committed to helping owners “spend smart money”. Our team is available to sit in on planning and negotiations with the OEM’s. When they see our team on your team, they know they cannot make promises they cannot keep. We keep the OEM honest and get a better value for your plant.

Sometimes an upgrade cannot be avoided and during the execution portion, our engineers watch over the OEM technicians to ensure they are following good practice and procedure. The demolition of the original systems can be the most critical step in the process. If the map isn’t made properly during Demo, the road can be easily lost causing schedule slip and making startup extremely difficult. We have seen weeks added on to outages because of poor execution plans.

MKV Retrofit

TC&E has partnered with Turbine Technologies Inc. to offer the TMOS SCADA replacement.

The TMOS SCADA was designed to be an easy, cost-effective replacement for the IDOS and Cimplicity HMI offered by the OEM.

Key Features

  • Easy migration of existing Runtime and Unit specific software files.
  • Does NOT require a MKV Firmware Prom Upgrade
  • Does NOT require a Turbine outage to upgrade.


AP4 Power Services 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 AP4 Power Services 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 are 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.