Near Leipzig in Germany, there is a field with 33500 solar panels. It produces enough energy for 1800 homes. That' s a lot of energy! However, there are problems. One problem is that solar energy is expensive, but the price is falling. "Thirty years ago it was cost-effective on satellites," says Daniel Shugar, president of Power Light Corporation. "Today, we can use it for houses and businesses." He says that in the future most houses will have solar panels. There are other problems with solar power. It needs a lot of space, and of course, it doesn't work at night.