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REGULATORY MATTERS (Tables) | 12 Months Ended
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Dec. 31, 2020
Regulated Operations [Abstract] |
Distribution Rate Orders | The following table summarizes the key terms of base distribution rate orders in effect for the Utilities as of December 31, 2020:
Company |  | Rates Effective |  | Allowed Debt/Equity |  | Allowed ROE
CEI |  | May 2009 |  | 51% / 49% |  | 10.5%
ME(1) |  | January 2017 |  | 48.8% / 51.2% |  | Settled(2)
MP |  | February 2015 |  | 54% / 46% |  | Settled(2)
JCP&L(3) |  | January 2017 |  | 55% / 45% |  | 9.6%
OE |  | January 2009 |  | 51% / 49% |  | 10.5%
PE (West Virginia) |  | February 2015 |  | 54% / 46% |  | Settled(2)
PE (Maryland) |  | March 2019 |  | 47% / 53% |  | 9.65%
PN(1) |  | January 2017 |  | 47.4% / 52.6% |  | Settled(2)
Penn(1) |  | January 2017 |  | 49.9% / 50.1% |  | Settled(2)
TE |  | January 2009 |  | 51% / 49% |  | 10.5%
WP(1) |  | January 2017 |  | 49.7% / 50.3% |  | Settled(2)
(1) Reflects filed debt/equity as final settlement/orders do not specifically include capital structure. (2) Commission-approved settlement agreements did not disclose ROE rates. (3) On October 28, 2020, the NJBPU approved JCP&L's distribution rate case settlement with an allowed ROE of 9.6% and a 48.56% debt / 51.44% equity capital structure. Rates are effective for customers on November 1, 2021, but beginning January 1, 2021, JCP&L will offset the impact to customers' bills by amortizing an $86 million regulatory liability. The following table summarizes the key terms of rate orders in effect for transmission customer billings for FirstEnergy's transmission owner entities as of December 31, 2020:
Company |  | Rates Effective |  | Capital Structure |  | Allowed ROE
ATSI |  | January 1, 2015 |  | Actual (13-month average) |  | 10.38%
JCP&L |  | January 2020(1) |  | Actual (13-month average)(1) |  | 10.80%(1)
MP |  | March 21, 2018(2)(4) |  | Settled(2)(3) |  | Settled(2)(3)
PE |  | March 21, 2018(2)(4) |  | Settled(2)(3) |  | Settled(2)(3)
WP |  | March 21, 2018(2)(4) |  | Settled(2)(3) |  | Settled(2)(3)
MAIT |  | July 1, 2017 |  | Lower of Actual (13-month average) or 60% |  | 10.3%
TrAIL |  | July 1, 2008 |  | Actual (year-end) |  | 12.7% (TrAIL the Line & Black Oak SVC) 11.7% (All other projects)
(1) As filed in docket ER20-227, effective on January 1, 2020, which has been accepted by FERC, subject to refund, pending further hearing and settlement procedures. The settlement agreement that was filed on February 2, 2021, seeking approval by FERC sets JCP&L's Allowed ROE at 10.2%. (2) Effective on January 1, 2021, MP, PE, and WP have implemented a forward-looking formula rate, which has been accepted by FERC, subject to refund, pending further hearing and settlement procedures. (3) FERC-approved settlement agreements did not specify. (4) See FERC Actions on Tax Act below.

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