Subway turnstiles generating electricity?

For the record, I was not looking for porn when I discovered this article.

This idea is so cool, I don't really want to waste time giving it a half-assed introduction like I usually do. It doesn't even look like Japan is using traditional turnstiles, but mats on the floor that sense vibration. Why not make the entire floor of Grand Central Station out of that stuff? Or plant the technology on major roadways to power remote road lighting? What, do I have to come up with all the cool applications for a technology I don't really understand? Well, maybe you should read the article before I go on, so you know what the hell I'm talking about.

The ticket gate electricity generation system relies on a series of piezo elements embedded in the floor under the ticket gates, which generate electricity from the pressure and vibration they receive as people step on them. When combined with high-efficiency storage systems, the ticket gate generators can serve as a clean source of supplementary power for the train stations. Busy train stations (and those with large numbers of passengers willing to bounce heavily through the gates) will be able to accumulate a relatively large amount of electricity.