This paper addresses the timing of optimal investment in LPG pipelines when the goal is to maximize consumer surplus less private cost and social of transporting LPG. The loss of consumer surplus is small. The important elements are the private cost of transporting LPG and the congestion created...

At the present time, solar power is not a competitive fuel for supplying electricity to the grid in the United States. However, an economic model developed by the U.S. National Renewable Energy Laboratory (NREL) forecasts that solar power production costs could drop twenty percent every time...