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Regulatory Matters (Tables)
12 Months Ended
Dec. 31, 2018
Regulated Operations [Abstract]  
Distribution Rate Orders
The following table summarizes the key terms of rate orders in effect for transmission customer billings for FirstEnergy's transmission owner entities:
Company
 
Rates Effective
 
Capital Structure
 
Allowed ROE
ATSI
 
January 1, 2015
 
Actual (13 month average)
 
10.38%
JCP&L
 
June 1, 2017
 
Settled(1)
 
Settled(1)
MP
 
March 21, 2018(2)
 
Settled(1)
 
Settled(1)
PE
 
March 21, 2018(2)
 
Settled(1)
 
Settled(1)
WP
 
March 21, 2018(2)
 
Settled(1)
 
Settled(1)
MAIT
 
July 1, 2017
 
50% / 50% (hypothetical)(3)
 
10.3%
TrAIL
 
July 1, 2008
 
Actual (year-end)
 
12.7% (TrAIL the Line & Black Oak SVC)
11.7% (All other projects)
(1) FERC-approved settlement agreements did not specify.
(2) See FERC Actions on Tax Act below.
(3) Effective January 2019, converts to lower of actual (13 month average) or 60%.

The following table summarizes the key terms of distribution rate orders in effect for the Utilities.
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
 
January 2017
 
55% / 45%
 
9.6%
OE
 
January 2009
 
51% / 49%
 
10.5%
PE-West Virginia
 
February 2015
 
54% / 46%
 
Settled(2)
PE-Maryland
 
November 1994
 
48% / 52%
 
11.9%
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.