Early Plant Retirements Early Plant Retirements	3 Months Ended
Early Plant Retirements Early Plant Retirements	Mar. 31, 2019
Early Plant Retirements [Line Items]
Early Plant Retirements	Early Plant Retirements Nuclear In May 2018, the governor of New Jersey signed legislation, referred to as the Zero Emission Certificate (ZEC) legislation, that recognizes that nuclear power is a critical component of New Jersey’s clean energy portfolio and an important element of a diverse energy generation portfolio that currently meets approximately 40 percent of New Jersey’s electric power needs. The ZEC legislation created a program administered by the BPU. The BPU established processes to provide for the purchase of ZECs from selected nuclear plants and recovery of those ZEC payments through a non-bypassable distribution charge (ZEC charge) in the amount of $0.004 per kilowatt-hour (which is equivalent to approximately $10 per megawatt hour (MWh)) in payments to selected nuclear plants. In April 2019, Power’s Salem 1, Salem 2 and Hope Creek nuclear plants were awarded ZECs. As a result, the final “must-offer” exception requests and deactivation notices previously submitted to the PJM Independent Market Monitor and the PJM Office of Interconnection for the Salem and Hope Creek plants have been withdrawn. These nuclear plants are expected to receive ZEC revenue for approximately three years, through May 2022, and will be obligated to maintain operations, subject to exceptions specified in the ZEC legislation. Power anticipates it will recognize revenue monthly as the nuclear plants generate electricity and satisfy their performance obligations. The ZEC legislation requires nuclear plants to reapply for any subsequent three year periods. The ZEC payment may be adjusted by the BPU (a) at any time to offset environmental or fuel diversity payments that a selected nuclear plant may receive from another source or (b) at certain times specified in the ZEC legislation if the BPU determines that the purposes of the ZEC legislation can be achieved through a reduced charge that will nonetheless be sufficient to achieve the state’s air quality and other environmental objectives by preventing the retirement of nuclear plants. The financial condition of the plants may nonetheless be materially adversely impacted by potential changes to the capacity market construct being considered by FERC (absent sufficient capacity revenues provided under a program approved by the BPU in accordance with a FERC authorized capacity mechanism), and, in the case of the Salem nuclear plants, decisions by the EPA and state environmental regulators regarding the implementation of Section 316(b) of the Clean Water Act and related state regulations, or other factors. Absent a material financial change, these adverse impacts could still result in Power taking all necessary steps to retire all of these plants following the end of the initial three year term of the ZECs program. Retirement of these plants would result in a material adverse impact on PSEG’s and Power’s financial results. Fossil PSEG and Power monitor their coal assets, including the Keystone and Conemaugh generating stations, to assess their economic viability through the end of their designated useful lives and their continued classification as held for use. The precise timing of a change in useful lives may be dependent upon events out of PSEG’s and Power’s control and may impact their ability to operate or maintain certain assets in the future. These generating stations may be impacted by factors such as environmental legislation, co-owner capital requirements and continued depressed wholesale power prices or capacity factors, among other things. Any early retirement or change in the held for use classification of our remaining coal units may have a material adverse impact on PSEG’s and Power’s future financial results.
Power [Member]
Early Plant Retirements [Line Items]
Early Plant Retirements	Early Plant Retirements Nuclear In May 2018, the governor of New Jersey signed legislation, referred to as the Zero Emission Certificate (ZEC) legislation, that recognizes that nuclear power is a critical component of New Jersey’s clean energy portfolio and an important element of a diverse energy generation portfolio that currently meets approximately 40 percent of New Jersey’s electric power needs. The ZEC legislation created a program administered by the BPU. The BPU established processes to provide for the purchase of ZECs from selected nuclear plants and recovery of those ZEC payments through a non-bypassable distribution charge (ZEC charge) in the amount of $0.004 per kilowatt-hour (which is equivalent to approximately $10 per megawatt hour (MWh)) in payments to selected nuclear plants. In April 2019, Power’s Salem 1, Salem 2 and Hope Creek nuclear plants were awarded ZECs. As a result, the final “must-offer” exception requests and deactivation notices previously submitted to the PJM Independent Market Monitor and the PJM Office of Interconnection for the Salem and Hope Creek plants have been withdrawn. These nuclear plants are expected to receive ZEC revenue for approximately three years, through May 2022, and will be obligated to maintain operations, subject to exceptions specified in the ZEC legislation. Power anticipates it will recognize revenue monthly as the nuclear plants generate electricity and satisfy their performance obligations. The ZEC legislation requires nuclear plants to reapply for any subsequent three year periods. The ZEC payment may be adjusted by the BPU (a) at any time to offset environmental or fuel diversity payments that a selected nuclear plant may receive from another source or (b) at certain times specified in the ZEC legislation if the BPU determines that the purposes of the ZEC legislation can be achieved through a reduced charge that will nonetheless be sufficient to achieve the state’s air quality and other environmental objectives by preventing the retirement of nuclear plants. The financial condition of the plants may nonetheless be materially adversely impacted by potential changes to the capacity market construct being considered by FERC (absent sufficient capacity revenues provided under a program approved by the BPU in accordance with a FERC authorized capacity mechanism), and, in the case of the Salem nuclear plants, decisions by the EPA and state environmental regulators regarding the implementation of Section 316(b) of the Clean Water Act and related state regulations, or other factors. Absent a material financial change, these adverse impacts could still result in Power taking all necessary steps to retire all of these plants following the end of the initial three year term of the ZECs program. Retirement of these plants would result in a material adverse impact on PSEG’s and Power’s financial results. Fossil PSEG and Power monitor their coal assets, including the Keystone and Conemaugh generating stations, to assess their economic viability through the end of their designated useful lives and their continued classification as held for use. The precise timing of a change in useful lives may be dependent upon events out of PSEG’s and Power’s control and may impact their ability to operate or maintain certain assets in the future. These generating stations may be impacted by factors such as environmental legislation, co-owner capital requirements and continued depressed wholesale power prices or capacity factors, among other things. Any early retirement or change in the held for use classification of our remaining coal units may have a material adverse impact on PSEG’s and Power’s future financial results.