|NRG ENERGY, INC. filed this Form 10-K on 03/01/2018|
Renewables gross margin and economic gross margin
Renewables gross margin increased $25 million and economic gross margin increased $29 million for the year ended December 31, 2016, compared to the same period in 2015, primarily driven by a 15% increase in generation at both the Mountain Wind I and II facilities, a 4% increase in generation at the Ivanpah solar plant and generation from the Guam solar plant that reached COD in the third quarter of 2015.
NRG Yield gross margin and economic gross margin
NRG Yield gross margin increased $71 million and economic gross margin increased $90 million for the year ended December 31, 2016, compared to the same period in 2015, primarily related to a 26% increase in volume generated at Alta wind projects as well as an increase in price per MWh at Alta X and XI wind projects as the PPAs began in January 2016 compared to merchant prices in 2015.
Mark-to-market for Economic Hedging Activities
Mark-to-market for economic hedging activities includes asset-backed hedges that have not been designated as cash flow hedges. Total net mark-to-market results increased by $59 million in the year ended December 31, 2016, compared to the same period in 2015.
The breakdown of gains and losses included in operating revenues and operating costs and expenses by region are as follows: