002.Randy Nickerson

8/8/2019 002.Randy Nickerson

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DUG East Marcellus and More Conference

November 3, 2010


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Forward-Looking Statements

This presentation contains forward-looking statements and information. These forward-looking statements, which in many instances can be identified bywords like could, may, will, should, expects, plans, project, anticipates, believes, planned, proposed, potential, and other comparable

words, regarding future or contemplated results, performance, transactions, or events, are based on MarkWest Energy Partners, L.P. (MarkWest and

Partnership) current information, expectations and beliefs, concerning future developments and their potential effects on MarkWest. Although webelieve that the expectations reflected in the forward-looking statements are reasonable, we can give no assurance that such expectations will prove tobe correct, and actual results, performance , distributions , events or transactions could vary significantly from those expressed or implied in suchstatements and are subject to a number of uncertainties and risks.

Among the factors that could cause results, performance, distributions, events or transactions to differ materially from those expressed or implied, arethose risks discussed in our Annual Report on Form 10-K for the year ended December 31, 2009, and our Quarterly Report on Form 10-Q for thequarter ended June 30, 2010, as filed with the SEC. You are urged to carefully review and consider the cautionary statements and other disclosures,including those under the heading Risk Factors, made in those documents. If any of the uncertainties or risks develop into actual events oroccurrences, or if underlying assumptions prove incorrect, it could cause actual results to vary significantly from those expressed in the presentation,and our business, financial condition, or results of operations could be materially adversely affected. Key uncertainties and risks that may directly affectMarkWests performance, future growth, results of operations, and financial condition, include, but are not limited to:

Fluctuations and volatility of natural gas, NGL products, and oil prices;

A reduction in natural gas or refinery off-gas production which we gather, transport, process, and/or fractionate;

A reduction in the demand for the products we produce and sell;

Financial credit risks / failure of customers to satisfy payment or other obligations under our contracts;

Effects of our debt and other financial obligations, access to capital, or our future financial or operational flexibility or liquidity;

Construction, procurement, and regulatory risks in our development projects;

Hurricanes, fires, and other natural and accidental events impacting our operations, and adequate insurance coverage;

Terrorist attacks directed at our facilities or related facilities;

Changes in and impacts of laws and regulations affecting our operations and risk management strategy; and

Failure to integrate recent or future acquisitions.


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Geographic Footprint

NORTHEASTAppalachia

330 MMcf/d processing capacity 24,000 Bbl/d NGL fractionation facility

260,000 barrel propane storage facility

NGL marketing by truck, rail, and barge

Michigan

250-mile interstate crude pipeline

LIBERTY

JV with The Energy & Minerals Group High-BTU acreage in the Marcellus

200 MMcf/d gathering capacity

275 MMcf/d cryogenic processing capacity

350 MMcf/d processing capacity under

construction

60,000 Bbl/d fractionator under construction

Planned 50,000 Bbl/d Mariner Ethane Project

GULF COASTJavelina

140 MMcf/d cryogenic gas plant

processing refinery off-gas

29,000 Bbl/d NGL fractionation capacity

NGL marketing and transportation

SOUTHWESTEast Texas

Cotton Valley, Travis Peak, Petit, andHaynesville


280 MMcf/d cryogenic processing

capacity

Interconnects to CEGT, NGPL, & TGT

Western Oklahoma

Anadarko Basin and Granite Wash


160 MMcf/d cryogenic processing

capacity

Interconnects to ANR, CEGT, NGPL, &

PEPL

Southeast Oklahoma

Largest Woodford Shale gathering

system 550 MMcf/d gathering capacity

Centrahoma processing JV

Arkoma Connector Pipeline JV

Interconnects to CEGT, CPFS, & Enogex


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Growth Driven by Customer Satisfaction

R A N G E RESOURCES

Since 2006, MarkWest has Ranked # 1 or #2 in Natural Gas Midstream Services Customer SatisfactionEnergyPoint Research, Inc. Customer Satisfaction Survey


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MarkWests Commitment to Major Unconventional Resource Plays

Map Source: RBC Capital Markets/RBC Richardson Barr

U.S. Gas Resource PlaysMarkWests Role in Emerging Resource Plays

MarkWest is the largest gatherer in the Woodford with asystem that covers more than 750 square miles of the core

Woodford shale.

MarkWests East Texas system covers more than 1,200square miles of the Haynesville shale.

MarkWest expanded its western Oklahoma system to gathersignificant new Granite Wash production in the TexasPanhandle.

MarkWest Liberty is the largest gatherer and processor in the

rich-gas area of the Marcellus Shale.

BarnettHaynesville

Fayetteville

Woodford(Arkoma)

Eagle Ford

GraniteWash

Marcellus/Huron

Acquisitions

Develop EmergingResource Plays

Build Base Production

* Includes growth capital that has been funded or is expected to be funded through joint ventures and divestiture activities.

0

100

200

300

400

500

600

2004 2005 2006 2007 2008 2009 2010F

Total Growth Capital Investment*

($inm

illions)


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6

Diverse Volume Growth

Major Resource PlaysMajor Resource Plays

0

200

400

600

800

1,000

1,200

1,400

1,600

2006 2007 2008 2009 2010F

MMcf/d

Emerging Resource Plays

Base Production (Conventional / Tight Sand)


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Resource Play Economics

Source: Credit Suisse

$2.6

6

$3.0

6$3.6

3

$3.9

6

$4.0

6

$4.0

8

$4.3

3

$4.3

6

$4.5

4

$4.6

0

$4.7

7

$4.8

5

$5.1

1

$5.2

1

$5.5

5

$5.7

4

$6.1

8 $7.4

3

$7

.52

$

7.8

1

$0.00

$2.00

$4.00

$6.00

$8.00

$10.00

$12.00

% Cost Inflation Scenario on NYMEX Breakeven PriceFor 15% ATAX ROR ($ per MMBtu)

Base +10% +20% +30% 2011 Gas Futures


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Long-term Appalachian History

MarkWest is the largest gas processor and fractionator in the Appalachian Basin with integrated processing,fractionation, storage, and marketing

Total gas processing capacity of approximately 330 MMcf/d in the Appalachian Basin

NGLs from four Appalachian processing gas plants are shipped to Siloam for fractionation, storage, and marketing

Existing propane and heavier fractionation capacity of 24,000 Bbl/d

Existing storage capacity of approximately 260,000 barrels

Long before the Marcellus was identified as a significant emerging shale play, we understood the importanceof vertically integrated gas processing and NGL fractionation, storage and marketing in the Northeast U.S.


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NGL Marketing in the Marcellus

Must be able to fractionate NGLs into purityproducts

Must have marketing options including truck,rail, and pipeline

Storage is critical

MarkWest Liberty can provide producers with allof these marketing services

The Northeast provides premium markets for NGLs produced in the Marcellus


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Strong Market for Marcellus NGLs in the Northeast

-

20,000

40,000

60,000

80,000

100,000

120,000

2010 2011 2012 2013 2014

Bbls/d Winter Propane Market vs MarkWest Production

Long Haul

Markets

Short Haul

Markets

Pipeline

Market

Local Truck

Market

MarkWest

Production

-

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

90,000

2010 2011 2012 2013 2014

Bbls/d Isobutane Refinery Market vs MarkWest Production

Indiana/Illinois

Refineries

New Jersey

Refineries

KY/OhioRefineries

Philadelphia,

PA Refineries

MarkWest

Production -

5,000

10,000

15,000

20,00025,000

30,000

35,000

40,000

45,000

2010 2011 2012 2013 2014

Bbls/d Natural Gasoline Market vs MarkWest Production

NE Gasoline

Blending

Crude

Diluent

Ethanol

Denaturant

MarkWest

Production

-

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

2010 2011 2012 2013 2014

Bbls/dSummer Propane Market vs MarkWest Production

Long HaulMarkets

Rail - ShortHaul

PipelineMarket

Storage

Local TruckMarket

MarkWestProduction


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`

Liberty Marcellus Project Schedule

Ohio

West Virginia

c

c

cc

c

c

c

c

Pennsylvania

Majorsville Processing Complex

Majorsville I 120 MMcf/d

Majorsville II (3Q11) 150 MMcf/d

NGL Pipeline to Houston

Smithfield Processing Complex

Smithfield I (TBD) 120 MMcf/d

NGL Pipeline to Majorsville (TBD)

Ohio

Houston Processing ComplexHouston I and II 155 MMcf/d

Houston III (1H11) 200 MMcf/d

Houston IV (TBD) 200 MMcf/d

MarkWest Liberty is developing integrated and scalable gathering, processing,fractionation, and marketing infrastructure to support production in excess of 1 Bcf/d

TEPPCO PRODUCTS PIPELINE

Houston Fractionation Complex

Depropanizer 5,000 Bbl/dayFull Fractionation (2011) 60,000 Bbl/day

Butane isomerization (1Q12) 10,000 Bbl/day

Rail Loading (3Q11) 200 Rail Cars

Truck Loading 8 Bays

C3 Pipeline TEPPCO Deliveries

NGL Storage 1.3 MBbls

Gathering Facilities

HP Pipelines 55 miles

HP Pipeline (4Q12) 125 150 miles

LP Pipelines 40 miles

LP Pipeline (4Q12) 200 250 miles

Compressor stations 10

Compressor stations (4Q12) 18 - 20

Compression 50,000 Hp

Compression (4Q12) 120,000 Hp

55 miles

125 150 miles

40 miles

200 250 miles

10

18 20

50,000 Hp

120,000 Hp


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Houston Plant Site June 2008


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Houston Plant Site September 2008


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Houston Plant Site September 2010


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Majorsville I Processing Facility October 2010


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Project Mariner Overview

Sunoco 8

Pipeline

New MarkWestLiberty Houston toDelmont Pipeline

SunocoPhiladelphiaStorage and

Docks

MarkWest Liberty will modify theHouston and Majorsville plants torecover ethane

MarkWest Liberty will construct a45-mile liquid ethane pipeline

Sunoco Logistics will convert itsexisting 250-mile, 8-inch refinedproducts pipeline to liquid ethaneservice

The pipeline will have capacity ofapproximately 50,000 bbl/day

Sunoco Logistics will constructrefrigerated ethane store facilities

and load it onto refrigerated LPGcarriers

LPG carriers will transport theethane to Gulf Coast markets

The Mariner Project will beoperational in 2012

A purity-ethane project to the Gulf Coast will maximize producer economics


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Gulf Coast Ethylene Market

Plaquemine, Louisiana

58,000 bpd of maximum ethane cracking capacity

Purity ethane storage

Proprietary dock for offloading

Lake Charles, Louisiana

85,000 bpd of maximum ethane cracking capacity

Purity ethane storage

Proprietary LNG dock for offloading ethane

Plaquemine, LA Lake Charles, LA Nederland, TX

Nederland Texas

200,000+ bpd of ethane cracking capacity

Purity ethane storage at Mt. Belvieu through displacement and flow

reversal

Potential additional ethane storage development

Market growth potential of up to an additional 40,000 bpd of ethane

SXL proprietary dock currently in crude oil and refined products use


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Project Mariner Marine Transport

Project Mariner includes two ships to allow for weather contingencies and optimization of offloading

schedules and volume increases

Each ship has a capacity of approximately 730,000 Bbls of ethane Marine transport is both flexible and reliable with over 1,200 ships safely shipping LPG cargo

worldwide

Moss-Rosenburg design is capable of carrying partial loads, allowing for multiple offloading sites

With the addition of skid mounted warming facilities, merchantable ethane can be distributed tomultiple offloading sites

Relationship of Liquid Petroleum Gas (LPG)to Natural Gas Liquids (NGL) and Liquefied Natural Gas (LNG)

Methane CH4(Specific Gravity .500)

Water, Carbon Dioxide, Nitrogen,and Other Non-Hydrocarbons

Ethane C2H6(Specific Gravity .540)

Propane C3H8

Butane

C4H10

Pentane C5H12and Heavier Fractions

LiquefiedNatural

Gas

LiquefiedNatural

Gas

NGLNGL LPGLPG


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1515 Arapahoe StreetTower 2, Suite 700Denver, Colorado 80202Phone: 303-925-9200Investor Relations: 866-858-0482Email: [email protected]: www.markwest.com

002.Randy Nickerson

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