in practice typical ORC efficiencies are around 10 to 20%, by integrating an ORC with a GT engine, total system efficiency can be increased by roughly 20% to 30%. Real-world GT efficiencies in the 25 MW power range of interest are between 35% and 40%, with 60-65% of fuel energy wasted as heat. If the ORC can harness 10% to 20% of the wasted heat energy (i.e., of the 65%), the total system efficiency increases to ~45%.