Detroit Free Press: Michigan electric companies say the voracious appetite for energy-sucking gadgets like plasma televisions, which use four times the power of old-fashioned screens, are pushing them to build the first new coal plants in the state in 20 years to satisfy the demand. Environmental groups say the sudden rush to build coal plants calls on a 19th-Century technology to solve 21st-Century problems. They oppose the plans, arguing that new coal plants will add global-warming gases at a …