tw imbal summaries couple fyi items socal balance 151 133 mmbtus 8 31 01 balance 300 521 mmbtus 9 23 01 received 33 130 mmbtus payback williams 23 rd decreased balance 242 260 mmbtus pg e topock balance 69 727 mmbtus due tw 9 23 01 index decrease eighty cents september cause loss volumetric oba