NOVELTY - A power generation apparatus (10) has a housing adapted for partial immersion in a body of water (11). The housing has an upper chamber (14) and a lower chamber (15). Waves (13) adjacent the surface of the body of water are made to pass through the upper chamber. Water is made to pass out through the lower chamber and into body of water. Each of the upper and lower chambers has a power generation portion (16). Preferably, the power generation portion may lie above the surface of the body of water.    USE - Power generation apparatus for producing electricity using wind and wave power. Can also be used in suitable body of water e.g. lake, river, ocean, preferably near obstacle e.g. river bank, shoreline, beach, retaining wall, that causes movement of water in two opposite directions. Can also be used with existing structure e.g. wharf, jetty, landing, oil rig, sea platform, desalination plant.    ADVANTAGE - The housing is formed from corrosion resistant material e.g. corrosion resistant metal, plastic, fiberglass, making the housing suitable for partial immersion in body of water. Water flowing through upper and lower chambers can move in opposite directions by locating apparatus near obstacle e.g. beach, making apparatus effective especially in cases where wave motion is present. Arrangement of upper and lower chambers effectively create another chamber within chamber, creating downward vortex effect that increases fluid kinetic energy or centrifugal force transferred to turbine of power generation apparatus. Flow of water in opposing directions enhances operation of power generation portions such as by producing Venturi effect as water moves through flow pathway. Apparatus may be equipped with warning device e.g. light, beacon, siren, to alert swimmers and or vessels of apparatus presence. Protective device e.g. screen, grate, mesh, may be added to inlet or outlet of each chamber, preventing unwanted object e.g. people, detritus, marine life, from accidentally entering into and getting trapped or injured within apparatus, while also preventing fouling of workings of apparatus by e.g. seaweed. Locating power generation portion above surface of body of water prevents water damage and provides improved accessibility in case of e.g. maintenance. Apparatus can be connected to other pieces of equipment e.g. desalination plant, ensuring steady water supply through chambers. Covering e.g. dome, cone, deflector, for partly concealing open upper end of housing prevents e.g. rain, snow, from entering housing and serves as storage or mounting for additional equipment e.g. solar energy collector. Housing may be constructed from individual modules stacked from ground level, eliminating need for using crane when apparatus is to be mounted on top of building or in confined space. Rotational members e.g. turbines, can be rotated slowly and independent of each other by wind entering power generation apparatus, reducing likelihood of apparatus damage or burning out. Energy losses in power take-off assembly, used with power generation apparatus, can be minimized, ensuring that much of input power or energy is directed towards accelerating assembly. Housing also encloses power take-off assembly, protecting it from damage and energy depleting effects from external objects and preventing damage to surrounding objects should flywheels rupture. Split-system flywheel for power take-off assembly allows flywheel thrust or load to be well distributed on shaft radially and longitudinally to reduce friction loss. Use of power take-off assembly enables apparatus to be used in situations where shaft rotation becomes too rapid, such as during e.g. storms, tidal waves. Engagement between one flywheel and power take-off device is enhanced by presence of e.g. gears, interposed between both. Clutch plate can be periodically engaged and disengaged relative to flywheel, minimizing loss of too much speed of drive device during flywheel acceleration.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a power take-off assembly; and    (2) a device for generating electricity.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of a power generation apparatus.    Power generation apparatus (10)    Body of water (11)    Waves (13)    Upper chamber (14)    Lower chamber (15)    Power generation portion (16)