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Since I live in a coastal area, where this type of energy can be exploited, conduct an investigation of that. and I throw myself as a result that would be an inexhaustible source. for me that would be on a large scale, but as you and I well know, you always need investment from private or state resources. the only thing that would slow it down is like the friend @andkill says,

but tomorrow a meteorite could also fall and we all died.

There are always waves. of great magnitude or of small mangintud, The installation consists of a series of cameras inserted inside the dike, with cavities exposed to the waves. When the wave reaches the dike, the water presses upwards the air of these chambers, so that it exits under pressure through the upper hole until reaching a turbine.