It has dropped, largely as a function of production. But production still is too small due to demand still too small. Something is wrong in a technolgoy that, 30 years after hitting the market, still can grow 24% in a year.

Solar cells need a huge, massive project that boosts them. Not such project is in screen, and selling their product in 4 sqqare meter packages barely is a business. The fact is, iy's a good technology for houses, but it won't work in apartment buildings until proficency grows. An apartments building only haves so much roof surface and solar energy is so cattered and solar cells are so few efficent that there's no way to supply more than common areas.

Meanwhile, there's some promising alternate energies with outputs that are plain frightening. What they call "blue energy" (reverse electrodyalisis with ion-selective membranes) produces about 1 megawatt per cubic meter of salt water per second...