Flexi Says: Coal was traditionally one of the cheapest sources of energy for power plants around the world. Coal forms in very large beds and in some cases can be mined at or very close to the surface. Coal is often more abundant and less costly to mine than oil or natural gas. However, the cost of renewable energy sources including solar have dropped significantly in recent years and are now less expensive than most coal power plants in the United States, India, and other countries.
