Near Leipzig in Germany,there is a field with 33,500 solar panels.It produces enough energy for 1,800 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 PowerLight Corporation. "Today, we can use it for houses and businesses." He say 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 worh at night.