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Investment in Unconsolidated Affiliate and Related Party Transactions | 12 Months Ended
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Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |
Equity Method Investments and Joint Ventures Disclosure [Text Block] | Investment in Unconsolidated Affiliate and Related Party Transactions On March 14, 2013, OGE Energy entered into a Master Formation Agreement with the ArcLight group and CenterPoint Energy, Inc., pursuant to which OGE Energy, the ArcLight Group and CenterPoint Energy, Inc., agreed to form Enable to own and operate the midstream businesses of OGE Energy and CenterPoint that was initially structured as a private limited partnership. This transaction closed on May 1, 2013. Pursuant to the Master Formation Agreement, OGE Energy and the ArcLight group indirectly contributed 100 percent of the equity interests in Enogex LLC to Enable. The Company determined that its contribution of Enogex LLC to Enable met the requirements of being in substance real estate and was recorded at historical cost. Immediately prior to closing, on May 1, 2013, the ArcLight group contributed $107.0 million and OGE Energy contributed $9.1 million to Enogex LLC in order to pay down short-term debt. The general partner of Enable is equally controlled by CenterPoint and OGE Energy, who each have 50 percent management ownership. Based on the 50/50 management ownership, with neither company having control, effective May 1, 2013, OGE Energy deconsolidated its interest in Enogex Holdings LLC and began accounting for its interest in Enable using the equity method of accounting. Pursuant to a Registration Rights Agreement dated as of May 1, 2013, OGE Energy and CenterPoint Energy, Inc. agreed to initiate the process for the sale of an equity interest in Enable in an initial public offering. On April 16, 2014, Enable completed an initial public offering of 25,000,000 common units resulting in Enable becoming a publicly traded Master Limited Partnership. The offering represented approximately 6.0 percent of the limited partner interests and raised approximately $464 million in net proceeds for Enable. In connection with the offering, underwriters exercised their option to purchase 3,750,000 additional common units which were fulfilled with units held by ArcLight. As a result of the offering, OGE Holding's ownership was reduced from 28.5 percent to 26.7 percent. On May 13, 2014, CenterPoint exercised its put right with respect to a 24.95 percent interest in SESH and pursuant to that right, on May 30, 2014, Enable issued 6,322,457 common units representing limited partner interests in Enable in exchange for CenterPoint's 24.95 percent interest in SESH. At December 31, 2014, OGE Energy held 26.3 percent of the limited partner interests in Enable. CenterPoint and OGE Energy also own a 40 percent and 60 percent interest, respectively, in any incentive distribution rights to be held by the general partner of Enable following the initial public offering. See Note 1 for more information regarding incentive distributions. Distributions received from Enable were $143.7 million during the year ended December 31, 2014. Related Party Transactions Operating costs charged and related party transactions between the Company and its affiliate, Enable, since its formation on May 1, 2013 are discussed below. Prior to May 1, 2013, operating costs charged and related party transactions between the Company and Enogex Holdings were eliminated in consolidation. OGE Energy's interest in Enogex Holdings was deconsolidated on May 1, 2013. On May 1, 2013, OGE Energy and Enable entered into a Services Agreement, Employee Transition Agreement, and other agreements whereby OGE Energy agreed to provide certain support services to Enable such as accounting, legal, risk management and treasury functions for an initial term ending on April 30, 2016. The support services automatically extend year-to-year at the end of the initial term, unless terminated by Enable with at least 90 days’ notice. Enable may terminate the initial support services at any time with 180 days notice if approved by the board of Enable's general partner. Under these agreements, OGE Energy charged operating costs to Enable of $16.8 million and $17.8 million for December 31, 2014 and December 31, 2013, respectively. OGE Energy charges operating costs to OG&E and Enable based on several factors. Operating costs directly related to OG&E and Enable are assigned as such. Operating costs incurred for the benefit of OG&E and Enable are allocated either as overhead based primarily on labor costs or using the "Distrigas" method. Effective April 1, 2014, Enable’s general partner, OGE Energy and CenterPoint agreed to reduce certain governance related costs billed to Enable for transition services. Additionally, OGE Energy agreed to provide seconded employees to Enable to support its operations for an initial term ending on December 31, 2014. OGE Energy did not transfer any employees to Enable at the formation of the partnership or any time through December 31, 2014. In October 2014, CenterPoint, OGE Energy and Enable agreed to continue the secondment to Enable for 192 OGE Energy employees that participate in OGE Energy's defined benefit and retirement plans, beyond December 31, 2014. The remaining OGE Energy seconded employees were terminated from OGE Energy on December 31, 2014 and were offered employment by Enable. OGE Energy billed Enable for reimbursement of $104.8 million and $67.7 million in 2014 and 2013, respectively, under the Transitional Seconding Agreement for employment costs incurred on or after May 1, 2013. OGE Energy had accounts receivable from Enable of $5.6 million and $12.4 million as of December 31, 2014 and December 31, 2013, respectively, for amounts billed for transitional services, including the cost of seconded employees. Pursuant to the transition agreements, Enable has agreed to reimburse OGE Energy for certain severance and termination costs related to the termination of OGE Energy's seconded employees. Related Party Transactions with Enable
| Year Ended
(In millions) | December 31, 2014 | December 31, 2013
Operating Revenues: |  |
Electricity to power electric compression assets | $ | 13.3 |  | $ | 7.7 |
Cost of Sales: |  |
Natural gas transportation services | $ | 34.9 |  | $ | 23.2 |
Natural gas storage services | 4.4 |  | 8.6 |
Natural gas purchases | 8.7 |  | 14.8 |
Summarized Financial Information of Enable Summarized unaudited financial information for 100 percent of Enable is presented below at December 31, 2014 and for the eight months ended December 31, 2013.
Balance Sheet | Year Ended December 31,
(In millions) | 2014 | 2013
Current assets | $ | 438 |  | $ | 549 |
Non-current assets | 11,399 |  | 10,683 |
Current liabilities | 671 |  | 720 |
Non-current liabilities | 2,344 |  | 2,331 |
Income Statement | Year Ended December 31,
(In millions) | 2014 | 2013
Operating revenues | $ | 3,367 |  | $ | 2,123 |
Cost of sales | 1,914 |  | 1,241 |
Operating income | 586 |  | 322 |
Net income attributable to Enable | 530 |  | 289 |
The formation of Enable was considered a business combination, and CenterPoint Midstream was the acquirer of Enogex Holdings for accounting purposes. Under this method, the fair value of the consideration paid by CenterPoint Midstream for Enogex Holdings is allocated to the assets acquired and liabilities assumed on May 1, 2013 based on their fair value. Enogex Holdings' assets, liabilities and equity have accordingly been adjusted to estimated fair value as of May 1, 2013, resulting in an increase to Enable's equity of $2.2 billion. Due to the contribution of Enogex LLC to Enable meeting the requirements of being in substance real estate and the recording the initial investment at historical cost, the effects of the amortization and depreciation expense associated with the fair value adjustments on Enable's results of operations have been eliminated in the Company's recording of its equity in earnings of Enable. OGE Energy recorded equity in earnings of unconsolidated affiliates of $172.6 million and $101.9 million for the twelve months ended December 31, 2014 and the eight months ended December 31, 2013, respectively. Equity in earnings of unconsolidated affiliates includes OGE Energy's share of Enable earnings adjusted for the amortization of the basis difference of OGE Energy's original investment in Enogex and its underlying equity in net assets of Enable. The basis difference is the result of the initial contribution of Enogex to Enable in May 2013, and subsequent issuances of equity by Enable, including the IPO in April 2014 and the issuance of common units for the acquisition of CenterPoint's 24.95 percent interest in SESH. The basis difference is being amortized over approximately 30 years, the average life of the assets to which the basis difference is attributed. Equity in earnings of unconsolidated affiliates is also adjusted for the elimination of the Enogex Holdings fair value adjustments, as described above. The difference between the Company's investment in Enable and its underlying equity in the net assets of Enable was $1.0 billion as of December 31, 2014. The following table reconciles OGE Energy's equity in earnings of its unconsolidated affiliates for the years ended December 31, 2014 and 2013.
| Year Ended December 31,
(In millions) | 2014 | 2013
OGE's share of Enable Net Income | $ | 143.1 |  | $ | 82.1 |
Amortization of basis difference | 14.0 |  | 9.4 |
Elimination of Enogex Holdings fair value and other adjustments | 15.5 |  | 10.4 |
OGE's Equity in earnings of unconsolidated affiliates | $ | 172.6 |  | $ | 101.9 |

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- Definition The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=35687916&loc=d3e32787-111569 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=35687916&loc=d3e32847-111569 + Details
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