There are several methods to generate electrical energy from wave motions, some of which are still in the experimental stage. Here are ten of the most important methods:

1 - Oscillating Water Columns (OWCs) - OWCs use the rise and fall of water columns in a chamber to drive a turbine and generate electricity.

2 - Point Absorbers - Point absorbers are buoy-like devices that capture wave energy and convert it to electricity using a hydraulic system.

3 - Oscillating Wave Surge Converters (OWSCs) - OWSCs use the motion of the waves to generate electricity by harnessing the horizontal and vertical motion of the waves.

4 - Wave Rollers - Wave rollers use the motion of the waves to drive a series of hydraulic pistons, which in turn generate electricity.

5 - Sea Snakes - Sea snakes are long, flexible devices that capture wave energy and convert it to electricity using a hydraulic system.

6 - Overtopping Devices - Overtopping devices use the force of the waves to push water up and over a barrier, which then falls through a turbine and generates electricity.

7 - Wave Energy Converters (WECs) - WECs capture the kinetic and potential energy of the waves and convert it to electricity using various methods.

8 - Floating Systems - Floating systems use a floating platform with a system of buoys, pumps, and turbines to convert the motion of the waves into electricity.

9 - Underwater Kites - Underwater kites are tethered to the sea floor and use the motion of the waves to generate electricity by moving a turbine.

10 - Diaphragm Devices - Diaphragm devices use the pressure changes in a chamber to drive a turbine and generate electricity.

It's worth noting that some of these methods are still in the experimental stage and may not be commercially viable yet.