Alpha Natural Resources 8-K Regulation FD Disclosure

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Jefferies 2nd Annual
Boston Energy Day

June 28-29, 2010

Exhibit 99.1

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Forward Looking Statements

Statements in this presentation which are not statements of historical fact are “forward-looking
statements” within the Safe Harbor provision of the Private Securities Litigation Reform Act of 1995.
Such statements are not guarantees of future performance. Many factors could cause our actual
results, performance or achievements, or industry results, to be materially different from any future
results, performance or achievements expressed or implied by such forward looking-statements.
These factors are discussed in detail in our Annual Report on Form 10-K,Quarterly Reports on
Form 10-Q and in our other filings with the SEC. We make forward-looking statements based on
currently available information, and we assume no obligation to update the statements made today
or contained in our Annual Report or other filings due to changes in underlying factors, new
information, future developments, or otherwise, except as required by law.

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ANR: Uniquely Positioned Industry Leader

vLeading U.S. supplier and exporter of metallurgical coal with expertise in
blending and optimization

vLow-cost, high margin Pittsburgh #8 longwall mines can supply U.S. or
international markets, including recent ~100K ton met shipment to China

vHigh volume Powder River Basin surface mines provide relatively stable
cash flow and reduced operating risk

vArguably the most regionally diversified producer in the U.S.

vMore export terminal capacity than any other U.S. producer

vPositioned for future growth with excellent liquidity, low leverage and a
portfolio of internal development opportunities

vBoard recently approved $125 million share repurchase authorization

vManageable exposure to Eastern U.S. surface mining and associated
permit risks

vFocus on consistent execution and positive free cash flow generation

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Coal Industry Themes - 2010

vStrong met coal pricing continues to be driven
by growing Asian demand, global recovery,
and supply disruptions

vMet coal tightness intensified in the United
States by recent and unexpected loss of high-
vol production

vUtility inventory levels anticipated to approach
normal levels in 2H10 - U.S. thermal market
positioned to strengthen

vFuture worldwide demand for thermal coal
anticipated to strain seaborne supply

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Strong Market Outlook

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U.S. Thermal Coal Market Improving

—Utility inventories decreased by approximately 40MTs from the 11/09 peak

—Eastern thermal coal production unlikely to expand in 2010 and may decline further

—Economic recovery driving increased industrial electricity demand

—Global recovery and shifting seaborne trading patterns should increase U.S. exports

—Crossover met coal should further constrain available supply in the U.S.

—New coal-fired generation will increase demand

—Current natural gas prices suggest less fuel switching compared with 2009

SOURCE: DOE NETL, Internal Analysis, Genscape

Current inventories of
approximately 170MTs suggest
normal inventories are likely
exiting the summer cooling season

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China & India Rely on Coal-fired Electricity

2010E: 78% coal-fired

2030E: 75% coal-fired

2010E: 65% coal-fired

2030E: 56% coal-fired

(Indian thermal coal imports have grown at 13% CAGR from 1990 - 2008)

Source:EIA IEO 2009; Booz & Company analysis

+4%

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Source:Wood Mackenzie; Booz & Company analysis

China = 14.8% CAGR

ROW = 1.5% CAGR

Scarcity of Metallurgical Coal

Global Steel Production

Metallurgical Coal Pricing (US$)

—As global steel production has grown, metallurgical coal has come to be viewed as a scarce
and differentiated product

—When worldwide production of steel exceeds 1.3 billion tons, the supply of met coal becomes
strained and incremental pricing can rise sharply as was seen in 2008

—While new projects are planned in places like Mozambique, Mongolia and Siberia, and
additional projects are planned in Australia, all must overcome various infrastructure
limitations or political challenges

—Supply constraints are likely to persist for several years

?

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China Driving Worldwide Met Demand

Chinese Growth is Permanently Changing Global Seaborne Met Coal Trading Dynamics

—Worldwide steel production is estimated to be on an annual pace of greater than 1.3B tonnes,
with over 600M tonnes expected from China alone in 2010, despite recent concerns of slowing
growth near-term

—Met imports reached 34M tonnes in 2009 and YTD 2010 imports through May were 17M tonnes

—Chinese demand will be satisfied primarily by Australia, which is near its current export capacity

—Availability of seaborne coking coal, which totaled an estimated 240M tonnes in 2008, will be
constrained by the growth of Chinese imports

SOURCE: China’s National Bureau of Statistics, Chinese Customs, Macquarie, Internal Analysis

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Robust Met Demand in Atlantic Basin

Met Coal Demand in the Atlantic Basin Has Increased As Developed
Economies Have Recovered and Steel Production Ramped Up

* ANR is a leading U.S. supplier & exporter of metallurgical coal with 13-14MTPA export capacity*

—Domestic producers’ rapid response to the recession in 2009 drove U.S. service center inventories to 26-
yr. lows, despite anemic demand for steel—restocking is now evident

—U.S. steel capacity utilization has increased steadily to the low-70% range, up from ‘09 lows in the 30s

—The rapid increase in capacity utilization and the unexpected loss of high quality high-vol production in the
U.S. has constrained supply near-term in the domestic market

—Strong Asian demand and increasing steel production in the rest of the world should drive robust met coal
demand in the Atlantic basin for several years

SOURCE: Metals Service Center Institute, American Iron and Steel Institute, Macquarie, Internal Analysis

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Investment Highlights

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Diversification/Scale=Consistent Execution

Following our merger on July 31, 2009, Alpha has delivered consistent execution
demonstrating the benefit of the company’s enhanced scale and diversification.

*ANR is arguably the most regionally diversified producer in the U.S. today*

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Consistent History of Positive Cash Flow

Note:Pro forma capex for 2008 and 2009 includes Lease-By-Application (LBA) bonus bid payments of $36.1 million each year.

FCF = Operating cash flow less capex

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Excellent Liquidity and Low Leverage

Note:LTM data as of 3/31/10

(1)Revolver was amended and extended by $300mm to $950mm on 4/15/2010, of which $96mm was terminated with a $39.6mm Term Loan A prepayment on 6/4/2010
(2)LTM combined pro forma Adjusted EBITDA for the quarter ended March 31, 2010

Leverage of approximately 1.1x debt/Adjusted EBITDA and liquidity of approximately $1.5 billion

($ millions)		Maturity	As of 6/18/10
$854mm Revolving Credit Facility1		July, 2014	$0
Term Loan A		July, 2014	236
2.375% Convertible Notes		April, 2015	288
7.25% Senior Unsecured Bonds		August, 2014	298
	Total Long-term Debt		$822
Liquidity and Credit Statistics
Cash & Equivalents and marketable securities			$669
Revolver1			854
Accounts Receivable Securitization Facility			150
Less: Letters of Credit Outstanding			(184)
	Total Potential Liquidity		$1,489
Total Debt / LTM EBITDA			1.1x
LTM Adjusted EBITDA2			$773

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•Maintaining safe and well-capitalized mines is priority #1

•Organic development—moving forward with development of organic met projects, DM #41
and Freeport; continuing the permitting of the Foundation Pitt #8 longwall mine; evaluating
other organic development opportunities as market conditions warrant

•Growth through acquisition—systematically evaluating domestic and international
opportunities to increase shareholder return through disciplined strategic transactions

•Seeking long-term access to growing international met and thermal markets—initial step in
2010 likely to include establishment of one or more modest sales and development offices
strategically located to participate in key Asian markets

•Focusing on opportunities to improve Alpha’s met and thermal assets within the U.S., with
emphasis on low-cost, long-lived production, sustainable end markets and export potential

Strategic Intent & Uses of Cash

Alpha’s strong cash position, excellent liquidity, low leverage and consistent cash flow generation
provides significant flexibility and a unique set of opportunities

Pursuing a balanced strategy of growth through organic development and acquisition with a
disciplined focus on value and return on investment

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•Returning cash to shareholders while retaining the financial flexibility to pursue strategic
growth opportunities

•$125 million share repurchase authorization recently approved by Alpha’s board

•Approximately $25 million purchased to date at an average price of $36.33 per share

•Repurchases made pursuant to 10b5-1 plan

•Repaying debt and maintaining strong liquidity position—prepaid $40 million of Term Loan A; 

    amended, extended and increased secured credit facility, resulting in total available liquidity of

    approximately $1.5 billion

•Continuing to cultivate Alpha’s valuable Marcellus acreage through Rice Energy JV, potentially

    augmenting and consolidating our footprint in order to optimize development

Strategic Intent & Uses of Cash (cont’d)

Pursuing a balanced strategy of growth through organic development and acquisition with a
disciplined focus on value and return on investment

Alpha’s strong cash position, excellent liquidity, low leverage and consistent cash flow generation
provides significant flexibility and a unique set of opportunities

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A Leader in the Domestic Coal Industry

Eastern Coal Operations

Illinois Basin

Western Coal Operations

Productioncapacity	55.0
2009 Shipments	50.1
Reserves	709

Reserves 26

Production Capacity	42.0
2009 Shipments	36.0
Reserves	1579

Note:Figures pro forma as of 12/31/09

Strength, Scale, Diversification

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•Alpha’s total export capacity from all US terminals is 13-14 MTPA, providing unique
blending, storage and transportation advantages

•Alpha holds a 41% interest in Dominion Terminal Associates (DTA): Alpha’s
estimated proportional export capacity is ~5.5 MTPA

•Alpha controls ~5.0 MT of capacity at Norfolk Southern’s Lamberts Point terminal
located in Norfolk, VA

•Additional capacity at Chesapeake Bay piers, Gulf of Mexico/New Orleans, and the
Great Lakes

U.S. Leader in Export Capacity

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Powder River Basin
Wyoming Operations	Expansion (MM tons/yr)	Capacity
Truck/shovel expansion	10	65 MTPY
Belle AyrLBA	200 Million Tons	Late 2010

Central Appalachia
Mine	Resource Description	Production
Deep Mine #41	~ 70 MM Ton Reserve	1.0 - 1.2 MTPY (metallurgical)
Harts Creek/Atenville	~ 120 MM Ton Reserve	2 - 3 MTPY (metallurgical potential)

Northern Appalachia
Mine	Resource Description	Production
Freeport - CM	~ 68 MM Ton Reserve	3 MTPY (metallurgical)
Foundation - longwall	~ 420 MM Ton Reserve	7 - 14 MTPY Pitt #8 (+ Sewickley)

Unconventional Gas
Project	Resource Description	Production
CBM	~ 100-200 Bcf Resource	~ 5,000 Salable Mcf/Day (current)
Marcellus acreage	~ 18,000 Acres	Entered into JV with Rice Energy 2010

Organic Growth Opportunities

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•50/50 Joint Venture with Rice Energy, LP

•Alpha controls ~18,000 acres of Marcellus in
Greene and Washington Counties of Pennsylvania

•Initial phase underway, recently drilled the first of
four wells planned for 2010

•Each partner committing acreage and cash

•Total phase 1 capital anticipated to be less than
$20 million

•JV potential to develop ~100 wells in the Marcellus

•Separately, Alpha’s CBM gas processing plant
expanding from capacity of 5,000 MCF/day to
10,000 MCF/day

Unconventional Gas Development

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Market Capitalization1 ($ in billions)

LTM 3/31/10 Tons Sold (in millions)

Peer Group Comparisons

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Recent Valuation Comparison 6/21/10

Notes: Market data and First Call consensus 2011 EBITDA estimates as of 6/21/10, pro forma for the MEE acquisition of Cumberland Resources and
the CNX acquisition of the Dominion gas assets and the remaining 17% of CXG.

< 50 MM TPY, regional

> 50 MM TPY, diversified

> 50 MM TPY, regional

Compelling Relative Valuation

ANR

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Coal Industry Themes

üANR is a leading U.S. supplier and exporter of
met coal with 13-14MTs of export terminal
capacity and worldwide customer base

üANR is positioned to benefit from the near-
term shortage of domestic high-vol stemming
from recent mine closures

üANR’s operations in NAPP, CAPP and PRB
can respond quickly to increasing demand for
thermal coal in the U.S.

üLow-cost production and export capacity
enable ANR to participate in global thermal
demand growth

vStrong met coal pricing continues to be
driven by growing Asian demand, global
recovery, and supply disruptions

vMet coal tightness intensified in the United
States by recent and unexpected loss of
high-vol production

vUtility inventory levels anticipated to
approach normal levels in 2H10 - U.S.
thermal market positioned to strengthen

vFuture worldwide demand for thermal coal
anticipated to strain seaborne supply

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Appendices

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4Q09 Reconciliation of Adjusted EBIDTA

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4Q09 Reconciliation of Adjusted Income

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1Q10 Reconciliation of Adjusted EBIDTA

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1Q10 Reconciliation of Adjusted Income

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