{"pre_text": ["entergy texas , inc .", "and subsidiaries management 2019s financial discussion and analysis plan to spin off the utility 2019s transmission business see the 201cplan to spin off the utility 2019s transmission business 201d section of entergy corporation and subsidiaries management 2019s financial discussion and analysis for a discussion of this matter , including the planned retirement of debt and preferred securities .", "results of operations net income 2011 compared to 2010 net income increased by $ 14.6 million primarily due to higher net revenue , partially offset by higher taxes other than income taxes , higher other operation and maintenance expenses , and higher depreciation and amortization expenses .", "2010 compared to 2009 net income increased by $ 2.4 million primarily due to higher net revenue and lower interest expense , partially offset by lower other income , higher taxes other than income taxes , and higher other operation and maintenance expenses .", "net revenue 2011 compared to 2010 net revenue consists of operating revenues net of : 1 ) fuel , fuel-related expenses , and gas purchased for resale , 2 ) purchased power expenses , and 3 ) other regulatory charges ( credits ) .", "following is an analysis of the change in net revenue comparing 2011 to 2010 .", "amount ( in millions ) ."], "post_text": ["the retail electric price variance is primarily due to rate actions , including an annual base rate increase of $ 59 million beginning august 2010 , with an additional increase of $ 9 million beginning may 2011 , as a result of the settlement of the december 2009 rate case .", "see note 2 to the financial statements for further discussion of the rate case settlement .", "the volume/weather variance is primarily due to an increase of 721 gwh , or 4.5% ( 4.5 % ) , in billed electricity usage , including the effect of more favorable weather on residential and commercial sales compared to last year .", "usage in the industrial sector increased 8.2% ( 8.2 % ) primarily in the chemicals and refining industries .", "the purchased power capacity variance is primarily due to price increases for ongoing purchased power capacity and additional capacity purchases. ."], "table": [["", "amount ( in millions )"], ["2010 net revenue", "$ 540.2"], ["retail electric price", "36.0"], ["volume/weather", "21.3"], ["purchased power capacity", "-24.6 ( 24.6 )"], ["other", "4.9"], ["2011 net revenue", "$ 577.8"]], "table_ori": [["", "Amount (In Millions)"], ["2010 net revenue", "$540.2"], ["Retail electric price", "36.0"], ["Volume/weather", "21.3"], ["Purchased power capacity", "(24.6)"], ["Other", "4.9"], ["2011 net revenue", "$577.8"]]}

Question: what is the average price per gwh for the variance in volume?
Evidence:
table_3: the volume/weather of amount ( in millions ) is 21.3 ;
text_8: see note 2 to the financial statements for further discussion of the rate case settlement .
text_9: the volume/weather variance is primarily due to an increase of 721 gwh , or 4.5% ( 4.5 % ) , in billed electricity usage , including the effect of more favorable weather on residential and commercial sales compared to last year .
Program: subtract(21.3, const_1000000), divide(#0, 721)
Answer:
str_answer: 29542.3
exe_answer: -1386.93301