1MW Kaplan Hydro Turbine Generator This 1MW Kaplan unit is designed for low head river and canal stations with a head of 5 to 25 m and a large flow. Runner blades are adjustable through the oil head servomotor, so the unit keeps efficiency high when head and flow vary through the season. Selling Points Adjustable blade runner. Blade angle follows the guide vane opening through the oil head servomotor, holding efficiency across a wide head and flow range. Low head capability.