NOVELTY - The capture system includes a wave energy conversion device (2) connected to a fluid transfer conduit (24) to pressurize fluid in the conduit in response to wave motion, a Pelton wheel (28) receiving the pressurized fluid via spear valve (26), a flow meter (40) and a pressure meter (42) to measure the flow rate and pressure of fluid, and a controller (38) to control the operation of the valve based on the detected pressure and flow rate as well as the speed of the wheel, which is connected to the flywheel (32). An accumulator (30) is between the valve and the conversion device.    USE - Wave power capture system for obtaining electrical power from wave energy e.g. coming from sea or other body of water.    ADVANTAGE - The controller controls the rate of flow of fluid from the fluid transfer conduit by controlling the spear valve, enabling the controller to aid in controlling the Pelton wheel or other turbine apparatus to operate in efficient range despite surges in pressure associated with wave motion. By providing the accumulator between the wave energy conversion device and the spear valve, energy surges resulting from increases in the fluid pressure can be at least partially damped. The accumulator can also store the energy temporarily and release it as the energy elsewhere in the system decreases. The speed of the Pelton wheel is maintained in efficient range due to storage of some of excess energy by the flywheel. By providing combination of the accumulator and the flywheel and the spear valve control, the Pelton wheel and the electrical power generation system can be maintained effectively at an efficient operating point without adverse impact on the operation of the wave energy conversion device. The system can operate to provide retention of maximum amount of energy in stable fashion through temporary energy storage using the flywheel and or the accumulator. Using water, preferably sea water, as fluid in the fluid transfer conduit enables the Pelton wheel and the spear valve as well as the controller and the electrical power generation system to be situated remotely from the wave energy conversion device, such as above the surface of the sea or on-shore. The Pelton wheel is robust, efficient, and readily scalable for high power applications.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a power extraction system for a wave power capture system;    (2) a controller for a wave power capture system;    (3) a method of controlling the operation of a wave power capture system; and    (4) a computer program product comprising computer readable instructions.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic diagram of a wave power capture system.    Wave energy conversion device (2)    Fluid transfer conduit (24)    Spear valve (26)    Pelton wheel (28)    Accumulator (30)    Flywheel (32)    Controller (38)    Flow meter (40)    Pressure meter (42)