This year will be the first time that natural gas is set to surpass coal in the U.S. as a main power source. Jim Cramer knew coal would be dethroned, but he was shocked by how fast it happened.
"I just didn't believe that our largely coal-based utility system could suddenly stop being largely coal based … sure, we figured natural gas would gradually surpass coal over time, we just didn't see it happening so soon," the "Mad Money" host said.
It seems that Cramer wasn't the only one shocked by the velocity of coal's popularity, either. As a result, he thinks it will have major implications on the stock market as many investors may have not anticipated the decline.
In 2015, 33 percent of U.S. power generation was from coal, while 33 percent came from natural gas, 20 percent from nuclear power, 6 percent from hydroelectric and 7 percent was sourced from renewable energy.