entergy arkansas 2019s receivables from or ( payables to ) the money pool were as follows as of december 31 for each of the following years. .
what was the sum of the entergy arkansas 2019s payables from 2015 to 2017 in millions
see note 4 to the financial statements for a description of the money pool . entergy arkansas has a credit facility in the amount of $ 150 million scheduled to expire in august 2022 . entergy arkansas also has a $ 20 million credit facility scheduled to expire in april 2018 . a0 a0the $ 150 million credit facility permits the issuance of letters of credit against $ 5 million of the borrowing capacity of the facility . as of december 31 , 2017 , there were no cash borrowings and no letters of credit outstanding under the credit facilities . in addition , entergy arkansas is a party to an uncommitted letter of credit facility as a means to post collateral to support its obligations to miso . as of december 31 , 2017 , a $ 1 million letter of credit was outstanding under entergy arkansas 2019s uncommitted letter of credit facility . see note 4 to the financial statements for further discussion of the credit facilities . the entergy arkansas nuclear fuel company variable interest entity has a credit facility in the amount of $ 80 million scheduled to expire in may 2019 . a0 a0as of december 31 , 2017 , $ 50 million in letters of credit to support a like amount of commercial paper issued and $ 24.9 million in loans were outstanding under the entergy arkansas nuclear fuel company variable interest entity credit facility . see note 4 to the financial statements for further discussion of the nuclear fuel company variable interest entity credit facility . entergy arkansas obtained authorizations from the ferc through october 2019 for short-term borrowings not to exceed an aggregate amount of $ 250 million at any time outstanding and borrowings by its nuclear fuel company variable interest entity . see note 4 to the financial statements for further discussion of entergy arkansas 2019s short-term borrowing limits . the long-term securities issuances of entergy arkansas are limited to amounts authorized by the apsc , and the current authorization extends through december 2018 . entergy arkansas , inc . and subsidiaries management 2019s financial discussion and analysis state and local rate regulation and fuel-cost recovery retail rates 2015 base rate filing in april 2015 , entergy arkansas filed with the apsc for a general change in rates , charges , and tariffs . the filing notified the apsc of entergy arkansas 2019s intent to implement a forward test year formula rate plan pursuant to arkansas legislation passed in 2015 , and requested a retail rate increase of $ 268.4 million , with a net increase in revenue of $ 167 million . the filing requested a 10.2% ( 10.2 % ) return on common equity . in september 2015 the apsc staff and intervenors filed direct testimony , with the apsc staff recommending a revenue requirement of $ 217.9 million and a 9.65% ( 9.65 % ) return on common equity . in december 2015 , entergy arkansas , the apsc staff , and certain of the intervenors in the rate case filed with the apsc a joint motion for approval of a settlement of the case that proposed a retail rate increase of approximately $ 225 million with a net increase in revenue of approximately $ 133 million ; an authorized return on common equity of 9.75% ( 9.75 % ) ; and a formula rate plan tariff that provides a +/- 50 basis point band around the 9.75% ( 9.75 % ) allowed return on common equity . a significant portion of the rate increase is related to entergy arkansas 2019s acquisition in march 2016 of union power station power block 2 for a base purchase price of $ 237 million . the settlement agreement also provided for amortization over a 10-year period of $ 7.7 million of previously-incurred costs related to ano post-fukushima compliance and $ 9.9 million of previously-incurred costs related to ano flood barrier compliance . a settlement hearing was held in january 2016 . in february 2016 the apsc approved the settlement with one exception that reduced the retail rate increase proposed in the settlement by $ 5 million . the settling parties agreed to the apsc modifications in february 2016 . the new rates were effective february 24 , 2016 and began billing with the first billing cycle of april 2016 . in march 2016 , entergy arkansas made a compliance filing regarding the .