U.S. natural gas production will decline by 5 percent by 2050, and consumption will shed 4 percent if no new interstate pipelines are built, the Energy Information Administration said in its latest Annual Energy Outlook. This, in turn, will lead to higher gas prices, the authority also said, and this will, in turn, lead to higher electricity prices. “The higher natural gas prices that result from capacity constraints primarily affect natural gas consumption in the U.S. electric power sector, which is more price-sensitive than the residential,…