INCOME TAXES	9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The effective income tax rates for the three months ended September 30, 2018 and 2017 were an expense of 62.0% and 24.4%, respectively, and for the nine months ended September 30, 2018 and 2017 were an expense of 7.9% and 20.4%, respectively. The period-over-period change in the effective income tax rate is due to the effects of rate-regulated accounting for income taxes, the goodwill impairment recorded in the third quarter of 2018, and other permanent items relative to the decrease in earnings for the three and nine months ended September 30, 2018, the impact of the United States federal corporate income tax rate reduction enacted in 2017, and a recovery in the second quarter of 2018 related to a change in assertion for the investment in Canadian renewable assets due to the sale which resulted in the recognition of previously unrecognized tax basis. Refer to Note 6. Acquisitions and Dispositions - Dispositions - Renewable 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 nine months ended September 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 September 30, 2018 and 2017 were an expense of 62.0% and 24.4%, respectively, and for the nine months ended September 30, 2018 and 2017 were an expense of 7.9% and 20.4%, respectively. The period-over-period change in the effective income tax rate is due to the effects of rate-regulated accounting for income taxes, the goodwill impairment recorded in the third quarter of 2018, and other permanent items relative to the decrease in earnings for the three and nine months ended September 30, 2018, the impact of the United States federal corporate income tax rate reduction enacted in 2017, and a recovery in the second quarter of 2018 related to a change in assertion for the investment in Canadian renewable assets due to the sale which resulted in the recognition of previously unrecognized tax basis. Refer to Note 6. Acquisitions and Dispositions - Dispositions - Renewable 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 nine months ended September 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.