The world is going the silicon way, with the increasing use of wireless equipment for remote sensing and data collection equipment in various industries; the problem that arises is the replacement of the batteries in the equipment, especially when the site is in remote and inaccessible locations like Oil pipelines, industrial machinery and bridges.
The best solution to the problem is to harness the energy around the equipment itself; like ambient light, electromagnetic radio-waves which are almost everywhere these days and mechanical vibrations. Mechanical vibration energy is pretty significant in industrial machinery, pipelines and bridges.
Harnessing the vibration energy could make replacing batteries redundant.