Exhibit 99.1

MOHEGAN TRIBAL GAMING AUTHORITY ANNOUNCES

FIRST QUARTER FISCAL 2015 OPERATING RESULTS

Uncasville, Connecticut, January 29, 2015 – The Mohegan Tribal Gaming Authority, or the Authority, the owner and operator of Mohegan Sun in Uncasville, Connecticut, and Mohegan Sun Pocono in Wilkes-Barre, Pennsylvania, announced today the operating results for its first fiscal quarter ended December 31, 2014.

“We are extremely pleased with our operating results for the quarter,” said Mitchell Grossinger Etess, Chief Executive Officer of the Authority. “During the quarter we achieved several measures of performance that indicate that our business is on the upswing including Mohegan Sun experiencing its largest quarterly increase in slot revenues since the fourth quarter of fiscal 2007. In addition, both Mohegan Sun and Mohegan Sun Pocono generated increased table game revenues, while Mohegan Sun’s Adjusted EBITDA margin for the quarter was its highest first quarter Adjusted EBITDA margin since fiscal 2006. Furthermore, with the expiration of relinquishment payments and recent positive progress related to our Cowlitz Project, our outlook is much improved.”

Consolidated operating results for the first quarter ended December 31, 2014 (unaudited):

The growth in Adjusted EBITDA and income from operations principally resulted from improved table game and slot results at Mohegan Sun combined with lower overall operating costs and expenses primarily driven by continued strategic changes in operations designed to improve profitability and focus on managing expenses and enhancing operating efficiencies. The growth in Adjusted EBITDA and income from operations also resulted from increased non-gaming and table game revenues at Mohegan Sun Pocono which benefited from a full period of hotel and convention center operations. In addition, Adjusted EBITDA and income from operations reflected lower year over year Corporate expenses resulting from reduced expenditures associated with our pursuit of a Massachusetts casino license. The increase in net income attributable to the Authority was primarily attributable to a non-recurring loss on early extinguishment of debt related to our November 2013 refinancing transactions, combined with the increase in income from operations.

Mohegan Sun

Operating results (in thousands, unaudited):

The growth in Adjusted EBITDA and income from operations resulted from the increase in gaming revenues and the reduction in operating costs and expenses. The increase in gaming revenues primarily resulted from increased table game and slot revenues which benefited from higher year over year hold percentages. The reduction in operating costs and expenses primarily reflected continued strategic changes in operations designed to improve profitability and focus on managing expenses and enhancing operating efficiencies resulting in reduced casino marketing and promotional expenses and payroll costs. These results were partially offset by reduced non-gaming revenues primarily reflecting lower gasoline and entertainment revenues. Adjusted EBITDA margin increased to 26.5% for the quarter ended December 31, 2014 from 20.9% in the first quarter of fiscal 2014.

Selected gaming data (in thousands, except where noted, unaudited):

Non-gaming data (in thousands, except where noted, unaudited):

Mohegan Sun Pocono

Operating results (in thousands, unaudited):

The slight decline in Adjusted EBITDA primarily resulted from lower slot revenues which we believe continued to be pressured by a sluggish regional economic environment, partially offset by higher non-gaming and table game revenues which benefited from a full period of hotel and convention center operations. The increase in income from operations resulted from non-recurring pre-opening costs and expenses associated with the November 2013 opening of the hotel and convention center. Adjusted EBITDA margin decreased slightly to 16.6% for the quarter ended December 31, 2014 from 16.7% in the first quarter of fiscal 2014.

Selected gaming data (in thousands, except where noted, unaudited):

Non-gaming revenues (in thousands, except where noted, unaudited):

Corporate

Operating results (in thousands, unaudited):

The decrease in loss from operations was primarily attributable to the decline in operating costs and expenses which resulted from reduced expenditures associated with our pursuit of a Massachusetts casino license.

Mohegan Tribal Gaming Authority Property Information

Other Information

Liquidity

As of December 31, 2014, the Authority held cash and cash equivalents of $74.2 million compared to $49.1 million as of September 30, 2014. As of December 31, 2014, $41.0 million was drawn on the Authority’s $100 million revolving credit facility and $6.0 million was drawn on the Authority’s $16.5 million line of credit. As of December 31, 2014, letters of credit issued under the Authority’s revolving credit facility totaled $3.1 million, of which no amounts were drawn. Inclusive of letters of credit, which reduce borrowing availability under the Authority’s revolving credit facility, and after taking into account restrictive financial covenant requirements, the Authority had approximately $49.9 million of borrowing capacity under its revolving credit facility and line of credit as of December 31, 2014.

Interest Expense

Interest expense decreased by $2.7 million, or 7.0%, to $36.3 million for the quarter ended December 31, 2014 compared to $39.0 million in the first quarter of fiscal 2014. The reduction in interest expense was attributable to lower weighted average interest rate driven by the Authority’s November 2013 refinancing transactions. Weighted average interest rate was 8.3% for the quarter ended December 31, 2014 compared to 9.2% in the first quarter of fiscal 2014. Weighted average outstanding debt was $1.75 billion for the quarter ended December 31, 2014 compared to $1.73 billion in the first quarter of fiscal 2014.

Capital Expenditures

The following table presents data related to capital expenditures (in millions):

Distributions to the Tribe

Distributions to the Tribe totaled $10.0 million for each of the quarters ended December 31, 2014 and 2013. Distributions to the Tribe are anticipated to total $50.0 million for fiscal 2015.

Conference Call

The Authority will host a conference call and simultaneous webcast regarding its first quarter fiscal 2015 operating results on Thursday, January 29, 2015 at 11:00 a.m. (Eastern Standard Time).

Those interested in participating in the call should dial as follows:

(877) 756-4274

(706) 643-0107 (International)

Conference ID: 73860522

Please call five minutes in advance to ensure that you are connected prior to the initiation of the call. Questions and answers will be reserved for call-in analysts and investors.

Parties who want to listen to the live conference call on the Internet may do so through a web link on the Authority’s website at www.mtga.com, under the “Investor Relations/Financial News” section. Interested parties also may listen to a taped replay of the entire conference call commencing two hours after the call’s completion on Thursday, January 29, 2015. This replay will run through February 12, 2015.

The access number for a taped replay of the conference call is as follows:

(855) 859-2056

(404) 537-3406 (International)

Conference ID: 73860522

A transcript will be available on the Authority’s website for a period of 90 days following the conference call.

About the Authority

The Authority is an instrumentality of the Mohegan Tribe of Indians of Connecticut, or the Tribe, a federally-recognized Indian tribe with an approximately 544-acre reservation situated in southeastern Connecticut, adjacent to Uncasville, Connecticut. The Authority has been granted the exclusive authority to conduct and regulate gaming activities on the existing reservation of the Tribe, including the operation of Mohegan Sun, a gaming and entertainment complex located on a 185-acre site on the Tribe’s reservation. Through its subsidiary, Downs Racing, L.P., the Authority also owns and operates Mohegan Sun Pocono, a gaming and entertainment facility located on a 400-acre site in Plains Township, Pennsylvania, and several off-track wagering facilities located elsewhere in Pennsylvania.

The Tribe’s gaming operation at Mohegan Sun is one of only two legally authorized gaming operations in southern New England offering traditional slot machines and table games. Mohegan Sun currently operates in an approximately 3.1 million square-foot facility, which includes Casino of the Earth, Casino of the Sky, Casino of the Wind, 100,000 square feet of retail space, including The Shops at Mohegan Sun, a 10,000-seat Mohegan Sun Arena, a 350-seat Cabaret Theatre, 100,000 square feet of meeting and convention space and the 1,200-room luxury Sky Hotel Tower. Mohegan Sun Pocono operates in an approximately 400,000 square-foot facility, offering traditional slot machines and table games, live harness racing and simulcast and off-track wagering, a 238-room hotel, 20,000 square feet of meeting and convention space, several dining and retail options and a bus passenger lounge. More information about the Authority and its properties can be obtained by visiting www.mohegansun.com, www.mohegansunpocono.com or www.mtga.com.

Special Note Regarding Forward-Looking Statements

Some information included in this press release may contain forward-looking statements, within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. These statements can sometimes be identified by the use of forward-looking words such as “may,” “will,” “anticipate,” “estimate,” “expect” or “intend” and similar expressions. Such forward-looking information may involve important risks and uncertainties that could significantly affect anticipated results in the future and, accordingly, such results may differ materially from those expressed in any forward-looking statements made by or on behalf of the Authority. Information concerning potential factors that could affect the Authority’s financial results is included in its Annual Report on Form 10-K for the fiscal year ended September 30, 2014, as well as in the Authority’s other reports and filings with the Securities and Exchange Commission. Any forward-looking statements included in this press release are made only as of the date of this release. The Authority does not undertake any obligation to update or supplement any forward-looking statements to reflect subsequent events or circumstances. The Authority cannot assure that projected results or events will be achieved or will occur.

MOHEGAN TRIBAL GAMING AUTHORITY

CONSOLIDATED STATEMENTS OF INCOME (LOSS)

(in thousands)

(unaudited)

MOHEGAN TRIBAL GAMING AUTHORITY

CONSOLIDATED SELECTED FINANCIAL INFORMATION

(in thousands)

(unaudited)

MOHEGAN SUN

SUPPLEMENTAL DATA

(unaudited)

MOHEGAN SUN POCONO

SUPPLEMENTAL DATA

(unaudited)

CORPORATE

SUPPLEMENTAL DATA

(unaudited)

MOHEGAN TRIBAL GAMING AUTHORITY

ADJUSTED EBITDA RECONCILIATIONS

(unaudited)

Reconciliations of Adjusted EBITDA to Net Income (Loss):

Reconciliations of Adjusted EBITDA to net income (loss), a financial measure determined in accordance with accounting principles generally accepted in the United States of America, or GAAP, are shown below (in thousands):

Reconciliations of Income (Loss) from Operations to Adjusted EBITDA (unaudited):

Reconciliations of income (loss) from operations, a financial measure determined in accordance with GAAP, to Adjusted EBITDA, are shown below (in thousands):

Adjusted EBITDA Explanation:

Net income before interest, income taxes, depreciation and amortization, or EBITDA, is a commonly used measure of performance in the casino and hospitality industry. EBITDA is not a measure of performance calculated in accordance with GAAP. The Authority historically has evaluated its operating performance with the non-GAAP measure, Adjusted EBITDA, which as used in this press release, represents net income before interest, depreciation and amortization, gain or loss on disposition of assets, pre-opening costs and expenses, reassessment and accretion of discount to a relinquishment liability, loss on early extinguishment of debt, other non-operating income and expense and loss attributable to non-controlling interests.

Adjusted EBITDA provides an additional way to evaluate the Authority’s operations and, when viewed with both the Authority’s GAAP results and the reconciliations provided, the Authority believes that it provides a more complete understanding of its business than could be otherwise obtained absent this disclosure. Adjusted EBITDA is presented solely as a supplemental disclosure because: (1) the Authority believes it enhances an overall understanding of the Authority’s past and current financial performance; (2) the Authority believes it is a useful tool for investors to assess the operating performance of the business in comparison to other operators within the casino and hospitality industry since Adjusted EBITDA excludes certain items that may not be indicative of the Authority’s operating results; (3) measures that are comparable to Adjusted EBITDA are often used as an important basis for the valuation of casino and hospitality companies; and (4) the Authority uses Adjusted EBITDA internally to evaluate the performance of its operating personnel and management and as a benchmark to evaluate its operating performance in comparison to its competitors.

The use of Adjusted EBITDA has certain limitations. Adjusted EBITDA should be considered in addition to, not as a substitute for or superior to, any GAAP financial measure including net income (as an indicator of the Authority’s performance) or cash flows provided by operating activities (as an indicator of the Authority’s liquidity), nor should it be considered as an indicator of the Authority’s overall financial performance. The Authority’s calculation of Adjusted EBITDA is likely to be different from the calculation of Adjusted EBITDA or other similarly titled measurements used by other casino and hospitality companies, and therefore, comparability may be limited. Adjusted EBITDA eliminates certain items from net income, such as interest and depreciation and amortization. Each of these items has been incurred in the past, will continue to be incurred in the future and should be considered in the overall evaluation of the Authority’s results. The Authority compensates for these limitations by providing relevant disclosures of items excluded in the calculation of Adjusted EBITDA, both in its reconciliations to the GAAP financial measure of net income and in its consolidated financial statements, all of which should be considered when evaluating its results. The Authority strongly encourages investors to review its financial information in its entirety and not to rely on a single financial measure.

Contacts:

Mitchell Grossinger Etess

Chief Executive Officer

Mohegan Tribal Gaming Authority

(860) 862-8000

Mario C. Kontomerkos

Chief Financial Officer

Mohegan Tribal Gaming Authority

(860) 862-8000