An abundance of fossil fuels combined with advances in technology to harness wind and solar power has sent energy prices crashing around the world. WSJ explains how it all happened at once. Photo illustration: Carlos Waters/WSJ Coal is on its way out of the electrical grid, but not without some dying flickers. Cheap, cleaner natural gas had been eating away coal’s market share for some time. But with natural gas prices edging toward $2.5 per million British thermal units, nearly 70% higher than the lowest point this year, the tables are about to be turned. Natural…