Recent developments suggest that solar panels that are expected to be in production by early 2002 will be able to compete with gas priced at $2.50 to $3.50 in the southern United States. If the cost of solar power continues to drop by a factor of two every five years, solar power will dominate gas for the production of electricity during the day within five years. Solar power produced hydrogen may be competitive with natural gas by 2010. The major uncertainty in the production of hydrogen is whether the cost of electrolyzers can be reduced.