INCOME TAXES	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The effective income tax rates for the three months ended June 30, 2018 and 2017 were a recovery of 7.9% and an expense of 19.1%, respectively, and for the six months ended June 30, 2018 and 2017 were a recovery of 10.2% and an expense of 18.3%, respectively. The period-over-period decrease in the effective income tax rate is due to the effects of rate-regulated accounting for income taxes and other permanent items relative to the decrease in earnings for the three and six months ended June 30, 2018, the impact of the United States federal corporate income tax rate reduction enacted in 2017, and a recovery related to a change in assertion for the investment in Canadian renewable energy generation assets due to the pending sale which resulted in a revaluation of the related deferred tax liability to the capital gains tax rate and recognition of previously unrecognized tax basis. Refer to Note 6. Dispositions - Renewable Energy Generation Assets for further discussion of the transaction. On December 22, 2017, the United States enacted the TCJA and we made reasonable estimates for the measurement and accounting of certain effects of the TCJA in our consolidated financial statements for the year ended December 31, 2017. We recorded a nil provision for the three and six months ended June 30, 2018, based on existing guidance and legislation, for the remaining effects of the TCJA including the Global Intangible Low Taxed Income tax and the Base Erosion and Anti-abuse Tax.

INCOME TAXES

The effective income tax rates for the three months ended June 30, 2018 and 2017 were a recovery of 7.9% and an expense of 19.1%, respectively, and for the six months ended June 30, 2018 and 2017 were a recovery of 10.2% and an expense of 18.3%, respectively. The period-over-period decrease in the effective income tax rate is due to the effects of rate-regulated accounting for income taxes and other permanent items relative to the decrease in earnings for the three and six months ended June 30, 2018, the impact of the United States federal corporate income tax rate reduction enacted in 2017, and a recovery related to a change in assertion for the investment in Canadian renewable energy generation assets due to the pending sale which resulted in a revaluation of the related deferred tax liability to the capital gains tax rate and recognition of previously unrecognized tax basis. Refer to Note 6. Dispositions - Renewable Energy Generation Assets for further discussion of the transaction.

On December 22, 2017, the United States enacted the TCJA and we made reasonable estimates for the measurement and accounting of certain effects of the TCJA in our consolidated financial statements for the year ended December 31, 2017. We recorded a nil provision for the three and six months ended June 30, 2018, based on existing guidance and legislation, for the remaining effects of the TCJA including the Global Intangible Low Taxed Income tax and the Base Erosion and Anti-abuse Tax.