In May and August 2025, the guarantee measurement (GM) was performed of on the TG5 unit at the Stejaru hydroelectric power plant in Romania at two different heads (130 m and 140 m). The thermodynamic method was used as the primary method of efficiency measurement, as was the case with the TG6 unit test in 2022.

Measurements confirm accomplishment of all guaranteed values for efficiency, vibrations, maximum power output, and other verified parameters. The measurements confirm the accomplishment of all the guaranteed values for efficiency, maximum power, vibration and other verified parameters.