Stock-based Compensation Expense Restricted and Performance Stock Unit activity (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures [Abstract]

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

Pursuant to the Portland General Electric Company Stock Incentive Plan as amended and restated effective February 13, 2018 (the Plan), the Company may grant a variety of equity-based awards, including restricted stock units (RSUs) with time-based vesting conditions (time-based RSUs) and performance-based vesting conditions (performance-based RSUs), to non-employee directors, officers, or certain key employees. RSU activity is summarized in the following table:

	Units	Weighted Average Grant Date Fair Value
Nonvested units as of December 31, 2017	399,376	$	37.98
Granted	198,864	37.99
Forfeited	(8,556)	39.73
Vested	(160,771)	36.77
Nonvested units of December 31, 2018	428,913	38.43
Granted	210,555	49.06
Forfeited	(9,041)	41.68
Vested	(167,037)	37.52
Nonvested units as of December 31, 2019	463,390	43.52
Granted	202,883	56.45
Forfeited	(17,341)	50.27
Vested	(170,536)	45.67
Nonvested units as of December 31, 2020	478,396	48.00

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

with the following weighted average assumptions:

	2020					2019					2018
Risk-free interest rate				1.4	%				2.5	%				2.4	%
Expected term (in years)				2.9					3.0					3.0
Volatility	13.5	%	-	97.3	%	14.8	%	-	74.5	%	14.7	%	-	21.8	%