Our Sun emits enough energy in one second to power global energy demand for over two hours. It is readily available and renewable and remains the most attractive source of energy that is not powered by fossil fuels. While harvesting solar energy has been relatively expensive and inefficient, technological advances in harvesting and converting sunlight promise to bring the cost down and improve the viability of solar energy.
In the coming years silicon solar cells are likely to improve their efficiency and come down in cost with a resulting increase in the uptake of this energy source by consumers. In the United States this lowering of the costs of solar power is projected to result in a 700% increase in uptake to 2050. The increase in bulk production of solar cells (reducing their cost) and improvements in solar technology promise to increase this even more.