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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

For the quarterly period ended September 30, 2013

OR

For the transition period from             to             

Commission file number 1-31383

ENBRIDGE ENERGY MANAGEMENT, L.L.C.

(Exact Name of Registrant as Specified in Its Charter)

1100 Louisiana, Suite 3300

Houston, Texas 77002

(Address of Principal Executive Offices) (Zip Code)

(713) 821-2000

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check One):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).     Yes  ¨    No  x

The Registrant had 62,580,105 Listed Shares outstanding as of October 31, 2013.

DOCUMENTS INCORPORATED BY REFERENCE:

Quarterly Report on Form 10-Q of Enbridge Energy Partners, L.P. for the quarterly period ended September 30, 2013.

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ENBRIDGE ENERGY MANAGEMENT, L.L.C.

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In this report, unless the context requires otherwise, references to “we,” “us,” “our,” the “Company” or “Enbridge Management” are intended to mean Enbridge Energy Management, L.L.C. We are a limited partner of Enbridge Energy Partners, L.P., which we refer to as the “Partnership.”

This Quarterly Report on Form 10-Q includes forward-looking statements, which are statements that frequently use words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,” “intend,” “may,” “plan,” “position,” “projection,” “should,” “strategy,” “target,” “will” and similar words. Although we believe that such forward-looking statements are reasonable based on currently available information, such statements involve risks, uncertainties and assumptions and are not guarantees of performance. Future actions, conditions or events and future results of operations may differ materially from those expressed in these forward-looking statements. Our results of operations, financial position and cash flows are dependent on the results of operations, financial position and cash flows of the Partnership. Many of the factors that will determine these results are beyond the Partnership’s ability to control or predict. Specific factors that could cause actual results to differ from those in the forward-looking statements include: (1) changes in the demand for or the supply of, forecast data for, and price trends related to crude oil, liquid petroleum, natural gas and NGLs, including the rate of development of the Alberta Oil Sands; (2) our ability to successfully complete and finance expansion projects; (3) the effects of competition, in particular, by other pipeline systems; (4) shut-downs or cutbacks at our facilities or refineries, petrochemical plants, utilities or other businesses for which we transport products or to whom we sell products; (5) hazards and operating risks that may not be covered fully by insurance, including those related to Lines 6B and any additional fines and penalties assessed in connection with the crude oil release on that line; (6) changes in or challenges to our tariff rates; and (7) changes in laws or regulations to which we are subject, including compliance with environmental and operational safety regulations that may increase costs of system integrity testing and maintenance.

For additional factors that may affect results, see “Item 1A. Risk Factors” of our Annual Report on Form 10-K for the year ended December 31, 2012 and our subsequently filed Quarterly Reports on Form 10-Q, which are available to the public over the Internet at the U.S. Securities and Exchange Commission’s, or SEC’s, website (www.sec.gov) and at our website (www.enbridgemanagement.com). Also see information regarding forward-looking statements and “Item 1A. Risk Factors” included in the Enbridge Energy Partners, L.P. Annual Report on Form 10-K for the year ended December 31, 2012, which we refer to as the Partnership’s 10-K, and in its subsequently filed Quarterly Reports on Form 10-Q for a discussion of risks to the Partnership that also may affect us.

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PART I—FINANCIAL INFORMATION

ENBRIDGE ENERGY MANAGEMENT, L.L.C.

STATEMENTS OF INCOME

The accompanying notes are an integral part of these financial statements.

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ENBRIDGE ENERGY MANAGEMENT, L.L.C.

STATEMENTS OF COMPREHENSIVE INCOME

The accompanying notes are an integral part of these financial statements.

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ENBRIDGE ENERGY MANAGEMENT, L.L.C.

STATEMENTS OF CASH FLOWS

The accompanying notes are an integral part of these financial statements.

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ENBRIDGE ENERGY MANAGEMENT, L.L.C.

STATEMENTS OF FINANCIAL POSITION

The accompanying notes are an integral part of these financial statements.

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ENBRIDGE ENERGY MANAGEMENT, L.L.C.

NOTES TO THE FINANCIAL STATEMENTS (unaudited)

1. BASIS OF PRESENTATION

We are a limited partner of Enbridge Energy Partners, L.P., which we refer to as the Partnership, through our ownership of i-units, a special class of the Partnership’s limited partner interests. Under a delegation of control agreement among us, the Partnership and its general partner, Enbridge Energy Company, Inc., referred to as the General Partner, we manage the Partnership’s business and affairs. We have prepared the accompanying unaudited interim financial statements in accordance with accounting principles generally accepted in the United States of America for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. In the opinion of management, they contain all adjustments, consisting only of normal recurring adjustments, which management considers necessary to present fairly our financial position at September 30, 2013, our results of operations for the three and nine month periods ended September 30, 2013 and 2012 and our cash flows for the nine month periods ended September 30, 2013 and 2012. We derived our statement of financial position as of December 31, 2012 from the audited financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012. Our results of operations for the three and nine month periods ended September 30, 2013 should not be taken as indicative of the results to be expected for the full year. The interim financial statements should be read in conjunction with our financial statements and notes thereto presented in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012. Our results of operations, financial position and cash flows are dependent on the results of operations, financial position and cash flows of the Partnership. As a result, you should also read these interim financial statements in conjunction with the Partnership’s consolidated financial statements and notes thereto presented in its Annual Report on Form 10-K for the fiscal year ended December 31, 2012, as well as the Partnership’s interim consolidated financial statements presented in its Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2013.

Partnership Incentive Distribution Rights

The General Partner of the Partnership receives incremental incentive cash distributions related to their incentive distribution rights, or IDR, on the portion of cash distributions that exceed certain target thresholds on a per unit basis under the Enbridge Energy Partners, L.P. partnership agreement. The incentive distributions payable to the Partnership’s General Partner are 15%, 25% and 50% of all quarterly distributions of available cash that exceed target levels of $0.295, $0.35 and $0.495 per limited partner units, respectively. The distributable amount of the IDR is divided among the Partnership’s limited partners: 1) Class A common units, 2) Class B common units and 3) i-units based on our ownership interest in the Partnership. Thus, our “Equity income (loss) from investment in Enbridge Energy Partners, L.P.” on our statements of income includes a pro-rata share of the IDR cost every quarter.

Partnership Preferred Unit Issuance

On May 7, 2013, the Partnership entered into the Series 1 Preferred Unit Purchase Agreement with the General Partner, to which the Partnership sold 48,000,000 Preferred Units, representing limited partner interests in the Partnership for proceeds of approximately $1.2 billion. These Preferred Units are entitled to annual cash distributions to which the quarterly cash distributions will not be payable on the Preferred Units during the first full eight quarters ending June 30, 2015. Instead, the cash distributions will accrue and accumulate and will be payable upon the earlier of the fifth anniversary of the issuance of Preferred Units or redemption of such Preferred Units by the Partnership. On or after June 1, 2016, at the sole option of the holder of the Preferred Units, the Preferred Units may be converted into the Partnership’s Class A Common Units. At the time of issuance, the Preferred Units were issued at a discount to the market price of the common units into which they are convertible. This discount represents a beneficial conversion feature, which is distributed ratably from the

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issuance date through the first available conversion date. The discount and cash distributions to the Preferred Unitholders results in an increase in the Partnership’s preferred capital and a decrease to our i-unit investment ownership in the Partnership through its impact from our “Equity income (loss) from investment in Enbridge Energy Partners, L.P.” on our statements of income. Quarterly cash distributions to Preferred Unitholders, whether accrued or paid, will reduce the amount of distributable available cash available to the Partnership’s holders of general and limited partner units, including i-units.

2. SHARE DISTRIBUTION

The following table sets forth the details regarding our share distributions, as approved by our board of directors, for the nine month period ended September 30, 2013.

We had non-cash operating activities in the form of i-units distributed to us by the Partnership and corresponding non-cash financing activities in the form of share distributions to our shareholders in the amounts of $79.7 million and $63.0 million during the nine month periods ended September 30, 2013 and 2012, respectively.

3. ISSUANCE OF LISTED SHARES

In March and September 2013, we completed a public offering of 10,350,000 and 8,424,686 Listed Shares, representing limited liability company interests with limited voting rights, at a price to the underwriters of $26.44 and $28.02 per Listed Share, respectively. We received net proceeds of $272.9 million and $235.6 million for the March and September 2013 issuances, respectively, which were subsequently invested in an equal number of the Partnership’s i-units.

The following table presents our issuances of additional Listed Shares for 2013.

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4. SUMMARIZED FINANCIAL INFORMATION FOR ENBRDIGE ENERGY PARTNERS, L.P.

We owned approximately 18.9% and 13.1% of the Partnership at September 30, 2013 and 2012, respectively.

5. SUBSEQUENT EVENTS

Share Distribution

On October 30, 2013, our board of directors declared a share distribution payable on November 14, 2013, to shareholders of record as of November 7, 2013, based on the $0.5435 per limited partner unit distribution declared by the Partnership. The Partnership’s distribution increases the number of i-units we own. The amount of this increase is calculated by dividing the cash amount distributed by the Partnership per common unit by the average closing price of one of our Listed Shares on the New York Stock Exchange for the 10 trading day period immediately preceding the ex-dividend date for our shares, multiplied by the number of shares outstanding on the record date. We distribute additional Listed Shares to our Listed shareholders and additional voting shares to the General Partner in respect of these additional i-units.

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RESULTS OF OPERATIONS

Our results of operations consist of our share of earnings of Enbridge Energy Partners, L.P., or the Partnership, attributed to the i-units, a special class of the Partnership’s limited partner interests, we own. At September 30, 2013 and 2012, through our ownership of i-units, we had an approximate 18.9% and 13.1%, respectively, limited partner interest in the Partnership. Our percentage ownership of the Partnership will change over time as the number of i-units we own becomes a different percentage of the total limited partner interests outstanding due to our ownership of additional i-units and other issuances of limited partner interests by the Partnership.

The information set forth under Part I, Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations of the Partnership’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2013 is hereby incorporated by reference, as our results of operations, financial position and cash flows are dependent on the results of operations, financial position and cash flows of the Partnership.

The following table presents the Partnership’s allocation of net income and loss to Enbridge Energy Company, Inc., the general partner of the Partnership, referred to as the General Partner, and limited partners for the periods presented.

Our net loss of $3.1 million and $11.0 million for the three and nine month periods ended September 30, 2013, respectively, and our net income of $15.4 million and $29.9 million for the three and nine month periods ended September 30, 2012, respectively, represents equity in earnings attributable to the i-units that we own decreased by deferred income tax expense. Deferred income tax expense is calculated based on the difference between the accounting and tax basis of our investment in the Partnership and the combined federal and state income tax rate of 37.4% for the three and nine month periods ended September 30, 2013 and 37.0% for the three and nine month periods ended September 30, 2012, applied to our share of the earnings of the Partnership for the respective periods.

For the three month period ended September 30, 2013, our net loss increased by $18.5 million, as compared to the net income in the same period in 2012. The net loss is primarily attributable to the $28.7 million increase in equity losses from the Partnership resulting from the increase in its incentive income distributions to the General Partner in relation to its net income in the same period in 2012. This decrease was offset by a $10.2 million decrease of income tax expense associated with the increase in our net loss.

For the nine month periods ended September 30, 2013, our net loss increased by $40.9 million, as compared to the net income in the same period in 2012. The net loss is primarily attributable to the $64.1 million increase in equity losses from the Partnership resulting from the increase in its incentive income distributions to the General Partner in relation to its net income in the same period in 2012. This decrease was offset by a $23.2 million decrease of income tax expense associated with the increase in our net loss. For the nine month period ended September 30, 2013, the Partnership had higher operating expenses in its Liquids segment as compared to the same period in 2012, primarily due to $22.1 million, after tax, in additional environmental expenses recognized in response to the March 14, 2013 order from the Environmental Protection Agency which requires

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additional containment and active recovery of submerged oil relating to the Line 6B crude oil release, partially offset by insurance recoveries of $4.3 million, after tax, recognized in the second quarter of 2013. In addition, in the third quarter of 2012, the Partnership received insurance proceeds of $12.5 million, net of Line 6B accruals, and did not receive any proceeds in the same period in 2013. Furthermore, in May 2013, we began receiving less allocating income from the Partnership due to the Preferred Units issuance. This caused our equity investment in the Partnership to decrease by $7.1 million while no such transactions existed in 2012.

Issuance of Listed Shares

In March and September 2013, we completed a public offering of 10,350,000 and 8,424,686 Listed Shares, representing limited liability company interests with limited voting rights, at a price to the underwriters of $26.44 and $28.02 per Listed Share, respectively. We received net proceeds of $272.9 million and $235.6 million for the March and September 2013 issuances, respectively, which were subsequently invested in an equal number of the Partnership’s i-units.

The following table presents our issuances of additional Listed Shares for 2013.

LIQUIDITY AND CAPITAL RESOURCES

Our authorized capital structure consists of two classes of membership interests: (1) our listed shares, which we refer to as Listed Shares, are traded on the New York Stock Exchange, or NYSE, and represent limited liability company interests with limited voting rights and (2) our voting shares, which represent limited liability company interests with full voting rights. At September 30, 2013, our issued capitalization consisted of $1,569.6 million associated with our 62,580,105 Listed Shares outstanding.

The number of our shares outstanding, including the voting shares owned by the General Partner, will at all times equal the number of i-units we own in the Partnership. Typically, the General Partner and owners of the Partnership’s Class A and B common units will receive distributions from the Partnership in cash. Instead of receiving cash distributions on the i-units we own, however, we receive additional i-units under the terms of the Partnership’s limited partnership agreement. The amount of additional i-units we receive is calculated by dividing the amount of the cash distribution paid by the Partnership on each of its Class A and B common units by the average closing price of one of our Listed Shares on the NYSE for the 10 trading day period immediately preceding the ex-dividend date for our shares, multiplied by the number of our shares outstanding on the record date. We make share distributions to our shareholders concurrently with the i-unit distributions we receive from the Partnership that increase the number of i-units we own. As a result of our share distributions, the number of shares outstanding is equal to the number of i-units that we own in the Partnership.

INCOME TAXES

For the three and nine month periods ended September 30, 2013, our income tax benefit of $1.0 million and $5.6 million was $10.2 million and $23.2 million less than the income tax expense we incurred for the

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corresponding periods in 2012, respectively. The increase in income tax benefit for the three and nine month periods ended September 30, 2013, as compared to the income tax expense in the same periods in 2012, was due to the increase in our net loss primarily associated with decreased amounts of equity income we recognized from the Partnership.

We computed our income tax expense for the three and nine month periods ended September 30, 2013 by applying a 37.4% effective income tax rate to our pre-tax income, which represents the federal statutory rate of 35.0% and the effective state income tax rate of 2.4%. For the three and nine month periods ended September 30, 2012, our income tax expense was computed by applying a 37.0% effective income tax rate to our pre-tax income, which represents the federal statutory rate of 35.0% and the effective state income tax rate of 2.0%.

SUBSEQUENT EVENTS

Share Distribution

On October 30, 2013, our board of directors declared a share distribution payable on November 14, 2013, to shareholders of record as of November 7, 2013, based on the $0.5435 per limited partner unit distribution declared by the Partnership. The Partnership’s distribution increases the number of i-units we own. The amount of this increase is calculated by dividing the cash amount distributed by the Partnership per common unit by the average closing price of one of our Listed Shares on the NYSE for the 10 trading day period immediately preceding the ex-dividend date for our shares, multiplied by the number of shares outstanding on the record date. We distribute additional Listed Shares to our Listed shareholders and additional voting shares to the General Partner in respect of these additional i-units.

The nature of our business and operations is such that we do not conduct activities or enter into transactions of the type requiring discussion under this item.

For a discussion of these matters as they pertain to the Partnership, please read the information set forth under Part I, Item 3. Quantitative and Qualitative Disclosures about Market Risk in the Partnership’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2013, which is hereby incorporated by reference, as activities of the Partnership have an impact on our results of operations and financial position.

Enbridge Management and Enbridge Inc., or Enbridge, maintain systems of disclosure controls and procedures designed to provide reasonable assurance that we are able to record, process, summarize and report the information required to be disclosed in the reports that we file or submit under the Securities Exchange Act of 1934, as amended, or the Exchange Act, within the time periods specified in the rules and forms of the SEC, and that such information is accumulated and communicated to our management, including our principal executive and principal financial officers, as appropriate, to allow timely decisions regarding required disclosure. Our management, with the participation of our principal executive and principal financial officers, has evaluated the effectiveness of our disclosure controls and procedures as of September 30, 2013. Based upon that evaluation, our principal executive and principal financial officers concluded that our disclosure controls and procedures are effective at a reasonable assurance level. In conducting this assessment, our management relied on similar evaluations conducted by employees of Enbridge affiliates who provide certain treasury, accounting and other services on our behalf.

There have been no changes in internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting during the three month period ended September 30, 2013.

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PART II—OTHER INFORMATION

We are a participant in various legal proceedings arising in the ordinary course of business. Some of these proceedings are covered, in whole or in part, by insurance. We believe that the outcome of all these legal proceedings will not, individually or in the aggregate, have a material adverse effect on our operating results, cash flows or financial position.

There have been no material changes to the risk factors previously disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012 and in our Quarterly Report on Form 10-Q for the six month period ended June 30, 2013

Reference is made to the “Index of Exhibits” following the signature page, which we hereby incorporate into this Item.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

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Index of Exhibits

Each exhibit identified below is filed as a part of this Quarterly Report on Form 10-Q. Exhibits included in this filing are designated by an asterisk; all exhibits not so designated are incorporated by reference to a prior filing as indicated.

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