For initial screening studies and top level analyses, Apex Cogen uses approximations of fuel consumptions, equipment outputs, and electricity/thermal energy production. For more detailed analysis, Apex Cogen uses proprietary spreadsheet-based heat balance calculations, and uses "GT Pro" software by Thermoflow Inc. under license.

State-of-the-art software, GT Pro is a state-of-the-art software programme that provides an excellent balance of ease-of-use and flexibility. It produces highly accurate heat balance results for turbine-based cycles, and preliminary designs for major equipment. The software contains a library database of more than 200 gas turbine engines which can be used to construct the heat balance model. It also provides links to manufacturers' cycle decks for computing performance of various models of gas turbines.

Design analysis and optimization. The GT Pro program is very flexible, with more than 1,700 user defined inputs as well as automated selections under a variety of criteria to simplify design. Critical parameters of fuel consumption, electrical and thermal output, emissions, and plant heat rate are calculated for simple cycle, combined cycle, cogeneration, and trigeneration modes under user-defined site conditions (altitude, varying ambient temperatures, relative humidity, etc.). Output is provided in a number of text reports and in colour graphical output diagrams that facilitate analysis and optimization.

Apex Cogen performs heat balance calculations for its detailed cogeneration evaluations, and offers heat balance and thermodynamic analysis and due diligence evaluation as a service to owners, other developers, and financial institutions.