AS series turbines are ducted Horizontal Axis Turbines (HAT) suitable for deployment with mono-directional blades in river environments and bi-directional blades in diurnal tidal locations. AS turbines feature a unique swept back blade design and ARCCOM control system to optimize turbine efficiency across flow velocity distributions. AS turbines are rated at 2.6m/s and are available in 100kW, 500kW and 1MW configurations. The AS-400™, the first of the AS series, has been designed from first principles using extensive computer modeling and following tow-testing in August 2008, is recognized as the world’s most efficient water-to-wire turbine as verified by Black & Veatch.