the retail electric price variance is primarily due to an increase in formula rate plan revenues , implemented with the first billing cycle of march 2016 , to collect the estimated first-year revenue requirement related to the purchase of power blocks 3 and 4 of the union power station in march 2016 and a provision recorded in 2016 related to the settlement of the waterford 3 replacement steam generator prudence review proceeding .
see note 2 to the financial statements for further discussion of the formula rate plan revenues and the waterford 3 replacement steam generator prudence review proceeding .
the louisiana act 55 financing savings obligation variance results from a regulatory charge recorded in 2016 for tax savings to be shared with customers per an agreement approved by the lpsc .
the tax savings resulted from the 2010-2011 irs audit settlement on the treatment of the louisiana act 55 financing of storm costs for hurricane gustav and hurricane ike .
see note 3 to the financial statements for additional discussion of the settlement and benefit sharing .
the volume/weather variance is primarily due to the effect of less favorable weather on residential and commercial sales and decreased usage during the unbilled sales period .
the decrease was partially offset by an increase of 1237 gwh , or 4% ( 4 % ) , in industrial usage primarily due to an increase in demand from existing customers and expansion projects in the chemicals industry .
2016 compared to 2015 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 charges .
following is an analysis of the change in net revenue comparing 2016 to 2015 .
amount ( in millions ) .

Amount (In Millions)
2015 net revenue
$2,408.8
Retail electric price
62.5
Volume/weather
(6.7)
Louisiana Act 55 financing savings obligation
(17.2)
Other
(9.0)
2016 net revenue
$2,438.4

the retail electric price variance is primarily due to an increase in formula rate plan revenues , implemented with the first billing cycle of march 2016 , to collect the estimated first-year revenue requirement related to the purchase of power blocks 3 and 4 of the union power station .
see note 2 to the financial statements for further discussion .
the volume/weather variance is primarily due to the effect of less favorable weather on residential sales , partially offset by an increase in industrial usage and an increase in volume during the unbilled period .
the increase in industrial usage is primarily due to increased demand from new customers and expansion projects , primarily in the chemicals industry .
the louisiana act 55 financing savings obligation variance results from a regulatory charge for tax savings to be shared with customers per an agreement approved by the lpsc .
the tax savings resulted from the 2010-2011 irs audit settlement on the treatment of the louisiana act 55 financing of storm costs for hurricane gustav and hurricane ike .
see note 3 to the financial statements for additional discussion of the settlement and benefit sharing .
included in other is a provision of $ 23 million recorded in 2016 related to the settlement of the waterford 3 replacement steam generator prudence review proceeding , offset by a provision of $ 32 million recorded in 2015 related to the uncertainty at that time associated with the resolution of the waterford 3 replacement steam generator prudence entergy louisiana , llc and subsidiaries management 2019s financial discussion and analysis .

Question: Analyse this data from a financial earnings document. how much higher was the net revenue in 2016 than 2015 ? ( in millions )
Choices:
1
2455.6
-2415.5
4847.2
29.6
Correct choice index: 4