[jyl]

[QUOTE=BK911;12534555]Maybe the object bends naturally, tides, gravity, temp difference, ???[

But is the object that is naturally bending also piezoelectric . . . if the ocean or trees were piezoelectric, that would be convenient.

If we have to attach a device to a naturally bending object, there’s probably better ways to generate energy from the bending - or the force producing the bending - than piezoelectric.

Generating electricity from tidal forces, for example. Wind turbines are way more effective than using piezoelectric on trees. Etc.