The slope is also different, with market-share varying more directly with overall thermal load size. With lower demand anticipated as weather moderates in the back half of March, the market share loss should be more pronounced, since thermal demand in the 8-10 BCFE range is showing a gas share around 37%, vs last year at 43%.
Compounding this loss for natural gas is the higher wind output experienced in MISO. Average daily wind output is 185 GWH this month, vs 135 last March. That's a MASSIVE difference, displacing something on the order of 400 MMCF per day. (The increased wind output isn't just in MISO either, it is big in SPP and ERCOT)