Acquisitions And Dispositions	12 Months Ended
Acquisitions And Dispositions	Dec. 31, 2012
Acquisitions And Dispositions	NOTE 15. ACQUISITIONS AND DISPOSITIONS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and Entergy Mississippi) Acquisitions Hot Spring Energy Facility In November 2012, Entergy Arkansas purchased the Hot Spring Energy Facility, a 620 MW combined-cycle natural gas turbine unit located in Malvern, Arkansas, from KGen Hot Spring LLC for approximately $253 million. The FERC and the APSC approved the transaction. Hinds Energy Facility In November 2012, Entergy Mississippi purchased the Hinds Energy Facility, a 450 MW combined-cycle natural gas turbine unit located in Jackson, Mississippi, from KGen Hinds LLC for approximately $206 million. The FERC and the MPSC approved the transaction. Acadia In April 2011, Entergy Louisiana purchased Unit 2 of the Acadia Energy Center, a 580 MW generating unit located near Eunice, Louisiana, from an independent power producer. The Acadia Energy Center, which entered commercial service in 2002, consists of two combined-cycle gas-fired generating units, each nominally rated at 580 MW. Entergy Louisiana purchased 100 percent of Acadia Unit 2 and a 50 percent ownership interest in the facility's common assets for approximately $300 million. In a separate transaction, Cleco Power acquired Acadia Unit 1 and the other 50 percent interest in the facility's common assets. Cleco Power will serve as operator for the entire facility. The FERC and the LPSC approved the transaction. Rhode Island State Energy Center In December 2011 a subsidiary in the Entergy Wholesale Commodities business segment purchased the Rhode Island State Energy Center, a 583 MW natural gas-fired combined-cycle generating plant located in Johnston, Rhode Island, from a subsidiary of NextEra Energy Resources, for approximately $346 million. The Rhode Island State Energy Center began commercial operation in 2002. Palisades Purchased Power Agreement Entergy's purchase of the Palisades plant in 2007 included a unit-contingent, 15-year purchased power agreement (PPA) with Consumers Energy for 100% of the plant's output, excluding any future uprates. Prices under the PPA range from $43.50/MWh in 2007 to $61.50/MWh in 2022, and the average price under the PPA is $51/MWh. For the PPA, which was at below-market prices at the time of the acquisition, Entergy will amortize a liability to revenue over the life of the agreement. The amount that will be amortized each period is based upon the difference between the present value calculated at the date of acquisition of each year's difference between revenue under the agreement and revenue based on estimated market prices. Amounts amortized to revenue were $17 million in 2012, $43 million in 2011, and $46 million in 2010. The amounts to be amortized to revenue for the next five years will be $18 million in 2013, $16 million for 2014, $15 million for 2015, $13 million for 2016, and $12 million for 2017. NYPA Value Sharing Agreements Entergy's purchase of the FitzPatrick and Indian Point 3 plants from NYPA included value sharing agreements with NYPA. In October 2007, Entergy subsidiaries and NYPA amended and restated the value sharing agreements to clarify and amend certain provisions of the original terms. Under the amended value sharing agreements, Entergy subsidiaries will make annual payments to NYPA based on the generation output of the Indian Point 3 and FitzPatrick plants from January 2007 through December 2014. Entergy subsidiaries will pay NYPA $6.59 per MWh for power sold from Indian Point 3, up to an annual cap of $48 million, and $3.91 per MWh for power sold from FitzPatrick, up to an annual cap of $24 million. The annual payment for each year's output is due by January 15 of the following year. Entergy will record the liability for payments to NYPA as power is generated and sold by Indian Point 3 and FitzPatrick. An amount equal to the liability will be recorded to the plant asset account as contingent purchase price consideration for the plants. In 2012, 2011, and 2010, Entergy Wholesale Commodities recorded approximately $72 million as plant for generation during each of those years. This amount will be depreciated over the expected remaining useful life of the plants. Dispositions Harrison County In the fourth quarter 2010, an Entergy Wholesale Commodities subsidiary sold its ownership interest in the Harrison County Power Project 550 MW combined-cycle plant to two Texas electric cooperatives that owned a minority share of the Marshall, Texas unit. Entergy sold its 61 percent share of the plant for $219 million and realized a gain of $44.2 million ($27.2 million net-of-tax) on the sale.
Entergy Louisiana [Member]
Acquisitions And Dispositions	NOTE 15. ACQUISITIONS AND DISPOSITIONS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and Entergy Mississippi) Acquisitions Hot Spring Energy Facility In November 2012, Entergy Arkansas purchased the Hot Spring Energy Facility, a 620 MW combined-cycle natural gas turbine unit located in Malvern, Arkansas, from KGen Hot Spring LLC for approximately $253 million. The FERC and the APSC approved the transaction. Hinds Energy Facility In November 2012, Entergy Mississippi purchased the Hinds Energy Facility, a 450 MW combined-cycle natural gas turbine unit located in Jackson, Mississippi, from KGen Hinds LLC for approximately $206 million. The FERC and the MPSC approved the transaction. Acadia In April 2011, Entergy Louisiana purchased Unit 2 of the Acadia Energy Center, a 580 MW generating unit located near Eunice, Louisiana, from an independent power producer. The Acadia Energy Center, which entered commercial service in 2002, consists of two combined-cycle gas-fired generating units, each nominally rated at 580 MW. Entergy Louisiana purchased 100 percent of Acadia Unit 2 and a 50 percent ownership interest in the facility's common assets for approximately $300 million. In a separate transaction, Cleco Power acquired Acadia Unit 1 and the other 50 percent interest in the facility's common assets. Cleco Power will serve as operator for the entire facility. The FERC and the LPSC approved the transaction. Rhode Island State Energy Center In December 2011 a subsidiary in the Entergy Wholesale Commodities business segment purchased the Rhode Island State Energy Center, a 583 MW natural gas-fired combined-cycle generating plant located in Johnston, Rhode Island, from a subsidiary of NextEra Energy Resources, for approximately $346 million. The Rhode Island State Energy Center began commercial operation in 2002. Palisades Purchased Power Agreement Entergy's purchase of the Palisades plant in 2007 included a unit-contingent, 15-year purchased power agreement (PPA) with Consumers Energy for 100% of the plant's output, excluding any future uprates. Prices under the PPA range from $43.50/MWh in 2007 to $61.50/MWh in 2022, and the average price under the PPA is $51/MWh. For the PPA, which was at below-market prices at the time of the acquisition, Entergy will amortize a liability to revenue over the life of the agreement. The amount that will be amortized each period is based upon the difference between the present value calculated at the date of acquisition of each year's difference between revenue under the agreement and revenue based on estimated market prices. Amounts amortized to revenue were $17 million in 2012, $43 million in 2011, and $46 million in 2010. The amounts to be amortized to revenue for the next five years will be $18 million in 2013, $16 million for 2014, $15 million for 2015, $13 million for 2016, and $12 million for 2017. NYPA Value Sharing Agreements Entergy's purchase of the FitzPatrick and Indian Point 3 plants from NYPA included value sharing agreements with NYPA. In October 2007, Entergy subsidiaries and NYPA amended and restated the value sharing agreements to clarify and amend certain provisions of the original terms. Under the amended value sharing agreements, Entergy subsidiaries will make annual payments to NYPA based on the generation output of the Indian Point 3 and FitzPatrick plants from January 2007 through December 2014. Entergy subsidiaries will pay NYPA $6.59 per MWh for power sold from Indian Point 3, up to an annual cap of $48 million, and $3.91 per MWh for power sold from FitzPatrick, up to an annual cap of $24 million. The annual payment for each year's output is due by January 15 of the following year. Entergy will record the liability for payments to NYPA as power is generated and sold by Indian Point 3 and FitzPatrick. An amount equal to the liability will be recorded to the plant asset account as contingent purchase price consideration for the plants. In 2012, 2011, and 2010, Entergy Wholesale Commodities recorded approximately $72 million as plant for generation during each of those years. This amount will be depreciated over the expected remaining useful life of the plants. Dispositions Harrison County In the fourth quarter 2010, an Entergy Wholesale Commodities subsidiary sold its ownership interest in the Harrison County Power Project 550 MW combined-cycle plant to two Texas electric cooperatives that owned a minority share of the Marshall, Texas unit. Entergy sold its 61 percent share of the plant for $219 million and realized a gain of $44.2 million ($27.2 million net-of-tax) on the sale.
Entergy Arkansas [Member]
Acquisitions And Dispositions	NOTE 15. ACQUISITIONS AND DISPOSITIONS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and Entergy Mississippi) Acquisitions Hot Spring Energy Facility In November 2012, Entergy Arkansas purchased the Hot Spring Energy Facility, a 620 MW combined-cycle natural gas turbine unit located in Malvern, Arkansas, from KGen Hot Spring LLC for approximately $253 million. The FERC and the APSC approved the transaction. Hinds Energy Facility In November 2012, Entergy Mississippi purchased the Hinds Energy Facility, a 450 MW combined-cycle natural gas turbine unit located in Jackson, Mississippi, from KGen Hinds LLC for approximately $206 million. The FERC and the MPSC approved the transaction. Acadia In April 2011, Entergy Louisiana purchased Unit 2 of the Acadia Energy Center, a 580 MW generating unit located near Eunice, Louisiana, from an independent power producer. The Acadia Energy Center, which entered commercial service in 2002, consists of two combined-cycle gas-fired generating units, each nominally rated at 580 MW. Entergy Louisiana purchased 100 percent of Acadia Unit 2 and a 50 percent ownership interest in the facility's common assets for approximately $300 million. In a separate transaction, Cleco Power acquired Acadia Unit 1 and the other 50 percent interest in the facility's common assets. Cleco Power will serve as operator for the entire facility. The FERC and the LPSC approved the transaction. Rhode Island State Energy Center In December 2011 a subsidiary in the Entergy Wholesale Commodities business segment purchased the Rhode Island State Energy Center, a 583 MW natural gas-fired combined-cycle generating plant located in Johnston, Rhode Island, from a subsidiary of NextEra Energy Resources, for approximately $346 million. The Rhode Island State Energy Center began commercial operation in 2002. Palisades Purchased Power Agreement Entergy's purchase of the Palisades plant in 2007 included a unit-contingent, 15-year purchased power agreement (PPA) with Consumers Energy for 100% of the plant's output, excluding any future uprates. Prices under the PPA range from $43.50/MWh in 2007 to $61.50/MWh in 2022, and the average price under the PPA is $51/MWh. For the PPA, which was at below-market prices at the time of the acquisition, Entergy will amortize a liability to revenue over the life of the agreement. The amount that will be amortized each period is based upon the difference between the present value calculated at the date of acquisition of each year's difference between revenue under the agreement and revenue based on estimated market prices. Amounts amortized to revenue were $17 million in 2012, $43 million in 2011, and $46 million in 2010. The amounts to be amortized to revenue for the next five years will be $18 million in 2013, $16 million for 2014, $15 million for 2015, $13 million for 2016, and $12 million for 2017. NYPA Value Sharing Agreements Entergy's purchase of the FitzPatrick and Indian Point 3 plants from NYPA included value sharing agreements with NYPA. In October 2007, Entergy subsidiaries and NYPA amended and restated the value sharing agreements to clarify and amend certain provisions of the original terms. Under the amended value sharing agreements, Entergy subsidiaries will make annual payments to NYPA based on the generation output of the Indian Point 3 and FitzPatrick plants from January 2007 through December 2014. Entergy subsidiaries will pay NYPA $6.59 per MWh for power sold from Indian Point 3, up to an annual cap of $48 million, and $3.91 per MWh for power sold from FitzPatrick, up to an annual cap of $24 million. The annual payment for each year's output is due by January 15 of the following year. Entergy will record the liability for payments to NYPA as power is generated and sold by Indian Point 3 and FitzPatrick. An amount equal to the liability will be recorded to the plant asset account as contingent purchase price consideration for the plants. In 2012, 2011, and 2010, Entergy Wholesale Commodities recorded approximately $72 million as plant for generation during each of those years. This amount will be depreciated over the expected remaining useful life of the plants. Dispositions Harrison County In the fourth quarter 2010, an Entergy Wholesale Commodities subsidiary sold its ownership interest in the Harrison County Power Project 550 MW combined-cycle plant to two Texas electric cooperatives that owned a minority share of the Marshall, Texas unit. Entergy sold its 61 percent share of the plant for $219 million and realized a gain of $44.2 million ($27.2 million net-of-tax) on the sale.
Entergy Mississippi [Member]
Acquisitions And Dispositions	NOTE 15. ACQUISITIONS AND DISPOSITIONS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and Entergy Mississippi) Acquisitions Hot Spring Energy Facility In November 2012, Entergy Arkansas purchased the Hot Spring Energy Facility, a 620 MW combined-cycle natural gas turbine unit located in Malvern, Arkansas, from KGen Hot Spring LLC for approximately $253 million. The FERC and the APSC approved the transaction. Hinds Energy Facility In November 2012, Entergy Mississippi purchased the Hinds Energy Facility, a 450 MW combined-cycle natural gas turbine unit located in Jackson, Mississippi, from KGen Hinds LLC for approximately $206 million. The FERC and the MPSC approved the transaction. Acadia In April 2011, Entergy Louisiana purchased Unit 2 of the Acadia Energy Center, a 580 MW generating unit located near Eunice, Louisiana, from an independent power producer. The Acadia Energy Center, which entered commercial service in 2002, consists of two combined-cycle gas-fired generating units, each nominally rated at 580 MW. Entergy Louisiana purchased 100 percent of Acadia Unit 2 and a 50 percent ownership interest in the facility's common assets for approximately $300 million. In a separate transaction, Cleco Power acquired Acadia Unit 1 and the other 50 percent interest in the facility's common assets. Cleco Power will serve as operator for the entire facility. The FERC and the LPSC approved the transaction. Rhode Island State Energy Center In December 2011 a subsidiary in the Entergy Wholesale Commodities business segment purchased the Rhode Island State Energy Center, a 583 MW natural gas-fired combined-cycle generating plant located in Johnston, Rhode Island, from a subsidiary of NextEra Energy Resources, for approximately $346 million. The Rhode Island State Energy Center began commercial operation in 2002. Palisades Purchased Power Agreement Entergy's purchase of the Palisades plant in 2007 included a unit-contingent, 15-year purchased power agreement (PPA) with Consumers Energy for 100% of the plant's output, excluding any future uprates. Prices under the PPA range from $43.50/MWh in 2007 to $61.50/MWh in 2022, and the average price under the PPA is $51/MWh. For the PPA, which was at below-market prices at the time of the acquisition, Entergy will amortize a liability to revenue over the life of the agreement. The amount that will be amortized each period is based upon the difference between the present value calculated at the date of acquisition of each year's difference between revenue under the agreement and revenue based on estimated market prices. Amounts amortized to revenue were $17 million in 2012, $43 million in 2011, and $46 million in 2010. The amounts to be amortized to revenue for the next five years will be $18 million in 2013, $16 million for 2014, $15 million for 2015, $13 million for 2016, and $12 million for 2017. NYPA Value Sharing Agreements Entergy's purchase of the FitzPatrick and Indian Point 3 plants from NYPA included value sharing agreements with NYPA. In October 2007, Entergy subsidiaries and NYPA amended and restated the value sharing agreements to clarify and amend certain provisions of the original terms. Under the amended value sharing agreements, Entergy subsidiaries will make annual payments to NYPA based on the generation output of the Indian Point 3 and FitzPatrick plants from January 2007 through December 2014. Entergy subsidiaries will pay NYPA $6.59 per MWh for power sold from Indian Point 3, up to an annual cap of $48 million, and $3.91 per MWh for power sold from FitzPatrick, up to an annual cap of $24 million. The annual payment for each year's output is due by January 15 of the following year. Entergy will record the liability for payments to NYPA as power is generated and sold by Indian Point 3 and FitzPatrick. An amount equal to the liability will be recorded to the plant asset account as contingent purchase price consideration for the plants. In 2012, 2011, and 2010, Entergy Wholesale Commodities recorded approximately $72 million as plant for generation during each of those years. This amount will be depreciated over the expected remaining useful life of the plants. Dispositions Harrison County In the fourth quarter 2010, an Entergy Wholesale Commodities subsidiary sold its ownership interest in the Harrison County Power Project 550 MW combined-cycle plant to two Texas electric cooperatives that owned a minority share of the Marshall, Texas unit. Entergy sold its 61 percent share of the plant for $219 million and realized a gain of $44.2 million ($27.2 million net-of-tax) on the sale.