entergy arkansas , inc . and subsidiaries management 2019s financial discussion and analysis stock restrict the amount of retained earnings available for the payment of cash dividends or other distributions on its common and preferred stock . sources of capital entergy arkansas 2019s sources to meet its capital requirements include : 2022 internally generated funds ; 2022 cash on hand ; 2022 debt or preferred stock issuances ; and 2022 bank financing under new or existing facilities . entergy arkansas may refinance , redeem , or otherwise retire debt and preferred stock prior to maturity , to the extent market conditions and interest and dividend rates are favorable . all debt and common and preferred stock issuances by entergy arkansas require prior regulatory approval . preferred stock and debt issuances are also subject to issuance tests set forth in entergy arkansas 2019s corporate charters , bond indentures , and other agreements . entergy arkansas has sufficient capacity under these tests to meet its foreseeable capital needs . entergy arkansas 2019s receivables from or ( payables to ) the money pool were as follows as of december 31 for each of the following years. .

2015: ( in thousands ): ( in thousands )
( $ 51232 ): -52742
2014: ( in thousands ): ( in thousands )
( $ 51232 ): 2218
2013: ( in thousands ): ( in thousands )
( $ 51232 ): 17531

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 2021 . entergy arkansas also has a $ 20 million credit facility scheduled to expire in april 2017 . the $ 150 million credit facility allows entergy arkansas to issue letters of credit against 50% ( 50 % ) of the borrowing capacity of the facility . as of december 31 , 2016 , 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 under miso . as of december 31 , 2016 , 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 additional 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 . as of december 31 , 2016 , no letters of credit were outstanding under the credit facility to support commercial paper issued by the entergy arkansas nuclear fuel company variable interest entity . see note 4 to the financial statements for additional discussion of the nuclear fuel company variable interest entity credit facility . entergy arkansas obtained authorizations from the ferc through october 2017 for short-term borrowings not to exceed an aggregate amount of $ 250 million at any time outstanding and long-term 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 tennessee regulatory authority ; the current authorizations extend through december 2018. .

Questions:
what was the balance of money pool in 2016?
and what was it in 2015?
what was, then, the change over the year?
and in the five years after this period, what is the total amount of the credit facilities that are going to expire, in millions?

Answers:
51232
52742
-1510
170