the retail electric price variance is primarily due to : 2022 formula rate plan increases at entergy louisiana , as approved by the lpsc , effective december 2014 and january 2015 ; 2022 an increase in energy efficiency rider revenue primarily due to increases in the energy efficiency rider at entergy arkansas , as approved by the apsc , effective july 2015 and july 2014 , and new energy efficiency riders at entergy louisiana and entergy mississippi that began in the fourth quarter 2014