entergy arkansas , inc . management's financial discussion and analysis gross operating revenues and fuel and purchased power expenses gross operating revenues increased primarily due to : an increase of $ 114 million in gross wholesale revenue due to an increase in the average price of energy available for resale sales and an increase in sales to affiliated customers ; an increase of $ 106.1 million in production cost allocation rider revenues which became effective in july 2007 as a result of the system agreement proceedings . as a result of the system agreement proceedings , entergy arkansas also has a corresponding increase in deferred fuel expense for payments to other entergy system companies such that there is no effect on net income . entergy arkansas makes payments over a seven-month period but collections from customers occur over a twelve-month period . the production cost allocation rider is discussed in note 2 to the financial statements and the system agreement proceedings are referenced below under "federal regulation" ; and an increase of $ 58.9 million in fuel cost recovery revenues due to changes in the energy cost recovery rider effective april 2008 and september 2008 , partially offset by decreased usage . the energy cost recovery rider filings are discussed in note 2 to the financial statements . the increase was partially offset by a decrease of $ 14.6 million related to volume/weather , as discussed above . fuel and purchased power expenses increased primarily due to an increase of $ 106.1 million in deferred system agreement payments , as discussed above and an increase in the average market price of purchased power . 2007 compared to 2006 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 credits . following is an analysis of the change in net revenue comparing 2007 to 2006 . amount ( in millions ) .
what is the percent change in net revenue between 2006 and 2007?
the net wholesale revenue variance is primarily due to lower wholesale revenues in the third quarter 2006 due to an october 2006 ferc order requiring entergy arkansas to make a refund to a coal plant co-owner resulting from a contract dispute , in addition to re-pricing revisions , retroactive to 2003 , of $ 5.9 million of purchased power agreements among entergy system companies as directed by the ferc . the transmission revenue variance is primarily due to higher rates and the addition of new transmission customers in late 2006 . the deferred fuel cost revisions variance is primarily due to the 2006 energy cost recovery true-up , made in the first quarter 2007 , which increased net revenue by $ 6.6 million . gross operating revenue and fuel and purchased power expenses gross operating revenues decreased primarily due to a decrease of $ 173.1 million in fuel cost recovery revenues due to a decrease in the energy cost recovery rider effective april 2007 . the energy cost recovery rider is discussed in note 2 to the financial statements . the decrease was partially offset by production cost allocation rider revenues of $ 124.1 million that became effective in july 2007 as a result of the system agreement proceedings . as .