We all know that you cannot produce more energy than you consume. Energy cannot be created nor removed it can only change form. However you can use a process which takes more energy from external sources than what it takes to create it.
You cannot have perpetual energy without harnessing an existing energy and changing it's form where as that form will naturally change back to the initial form. and you must also use less energy to change its form than what is produced by the change.
The closest example os such a process is by use of HHO, Splitting H2O into HHO then burning it to create the energy. When HHO is burned it produces H2O however it takes more energy to split H2O into HHO then what is created while burning it. If you could find a way to improve the process of splitting H2O into HHO then you would have a free energy process. However, this cannot be done because energy cannot be created or removed it can only change form so you are left with one option, harness energy from an existing source.
Luckily we have several sources of existing energy. The largest is the sun, which puts off energy in many forms which can be harnessed. Waves, Wind and Solar.. in order of availability. Some will say that solar or wind will have more energy however, the fact is that 70% of our planet is water and therefore it absorbs 70% of the energy from the sun to our planet surface (excluding atmosphere of course).
The following is a process in which you can use to create energy from waves:
5% of the world’s waves can power the entire planet with the use of a simple buoy tethered to the bottom of a water mass. Each wave will exert vertical force on the buoy and tether. If the force on the tether is harnessed in to form of a piston, crank or geared motor you can transfer the force of the energy from the wave into usable electricity.
A simple diagram shows the basic method for this.