entergy arkansas , inc . and subsidiaries management 2019s financial discussion and analysis entergy arkansas 2019s receivables from the money pool were as follows as of december 31 for each of the following years: .
what was the average receivables for entergy arkansas from 2008 to 2011
in april 2011 , entergy arkansas entered into a new $ 78 million credit facility that expires in april 2012 . there were no outstanding borrowings under the entergy arkansas credit facility as of december 31 , 2011 . entergy arkansas has obtained short-term borrowing authorization from the ferc under which it may borrow through october 2013 , up to the aggregate amount , at any one time outstanding , of $ 250 million . see note 4 to the financial statements for further discussion of entergy arkansas 2019s short-term borrowing limits . entergy arkansas has also obtained an order from the apsc authorizing long-term securities issuances through december state and local rate regulation and fuel-cost recovery retail rates 2009 base rate filing in september 2009 , entergy arkansas filed with the apsc for a general change in rates , charges , and tariffs . in june 2010 the apsc approved a settlement and subsequent compliance tariffs that provide for a $ 63.7 million rate increase , effective for bills rendered for the first billing cycle of july 2010 . the settlement provides for a 10.2% ( 10.2 % ) return on common equity . production cost allocation rider the apsc approved a production cost allocation rider for recovery from customers of the retail portion of the costs allocated to entergy arkansas as a result of the system agreement proceedings . these costs cause an increase in entergy arkansas 2019s deferred fuel cost balance , because entergy arkansas pays the costs over seven months but collects them from customers over twelve months . see note 2 to the financial statements and entergy corporation and subsidiaries 201cmanagement 2019s financial discussion and analysis - system agreement 201d for discussions of the system agreement proceedings . energy cost recovery rider entergy arkansas 2019s retail rates include an energy cost recovery rider to recover fuel and purchased energy costs in monthly bills . the rider utilizes prior calendar year energy costs and projected energy sales for the twelve- month period commencing on april 1 of each year to develop an energy cost rate , which is redetermined annually and includes a true-up adjustment reflecting the over-recovery or under-recovery , including carrying charges , of the energy cost for the prior calendar year . the energy cost recovery rider tariff also allows an interim rate request depending upon the level of over- or under-recovery of fuel and purchased energy costs . in early october 2005 , the apsc initiated an investigation into entergy arkansas's interim energy cost recovery rate . the investigation focused on entergy arkansas's 1 ) gas contracting , portfolio , and hedging practices ; 2 ) wholesale purchases during the period ; 3 ) management of the coal inventory at its coal generation plants ; and 4 ) response to the contractual failure of the railroads to provide coal deliveries . in march 2006 , the apsc extended its investigation to cover the costs included in entergy arkansas's march 2006 annual energy cost rate filing , and a hearing was held in the apsc energy cost recovery investigation in october 2006. .