It declined slightly (-1.6%) last year in significant part because the winter was warmer than average resulting in lower heating demand. They've had year over year declines like that in the past (there was a larger one in 2015) so it's too early to tell if it'll stick, and they're starting from such a massive proportion of coal "basically standing still" numbers like that aren't going to move the needle for a long time.
alt Hacker News
It declined slightly (-1.6%) last year in significant part because the winter was warmer than average resulting in lower heating demand. They've had year over year declines like that in the past (there was a larger one in 2015) so it's too early to tell if it'll stick, and they're starting from such a massive proportion of coal "basically standing still" numbers like that aren't going to move the needle for a long time.