MarkWest Energy Partners, LP (MWE)

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Appalachia

        Revenues:    Total revenues increased $9.1 million, or 14%, during the year ended December 31, 2006, relative to the comparable period in 2005. The increase was primarily a result of higher prices and volumes for our Maytown NGLs in 2006. Higher gas volumes at the Kenova and Cobb plants and higher liquid volumes at the Kenova, Cobb and Boldman plants also contributed to the increase; however, these results were offset slightly by lower gas volumes at Boldman.

        Purchased Product Costs:    Purchased product costs increased $5.2 million, or 14%, during the year ended December 31, 2006, relative to the comparable period in 2005. The rise in costs is primarily a result of higher product prices. The increase was partially offset by reduced trucking expenses amounting to $1.4 million associated with our continuing repair of the ALPS pipeline in 2005 versus the shutdown of the ALPS pipeline in late 2006.

        Facility Expenses:    Facility expenses decreased $5.4 million, or 28%, during the year ended December 31, 2006, relative to the comparable period in 2005. These expenses were higher in 2005 due to costs incurred to repair the ALPS pipeline.

        Depreciation:    Depreciation expense increased $0.4 million, or 12%, during the year ended December 31, 2006, relative to the comparable period in 2005, due to increased capitalized leasehold improvements associated with the ALPS pipeline.

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Appalachia

        Revenues:    Total revenues increased $9.1 million, or 14%, during the year ended December 31, 2006, relative to
the comparable period in 2005. The increase was primarily a result of higher prices and volumes for our Maytown NGLs in 2006. Higher gas volumes at the Kenova and Cobb plants and higher liquid volumes
at the Kenova, Cobb and Boldman plants also contributed to the increase; however, these results were offset slightly by lower gas volumes at Boldman.

        Purchased Product Costs:    Purchased product costs increased $5.2 million, or 14%, during the year ended
December 31, 2006, relative to the comparable period in 2005. The rise in costs is primarily a result of higher product prices. The increase was partially offset by reduced trucking expenses
amounting to $1.4 million associated with our continuing repair of the ALPS pipeline in 2005 versus the shutdown of the ALPS pipeline in late 2006.

        Facility Expenses:    Facility expenses decreased $5.4 million, or 28%, during the year ended December 31, 2006,
relative to the comparable period in 2005. These expenses were higher in 2005 due to costs incurred to repair the ALPS pipeline.

        Depreciation:    Depreciation expense increased $0.4 million, or 12%, during the year ended December 31, 2006,
relative to the comparable period in 2005, due to increased capitalized leasehold improvements associated with the ALPS pipeline.

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 Appalachia.

 Frank Semple  - MarkWest Hydrocarbon, Inc. - President, CEO.

 Yeah, it’s been the operations have been fairly flat. When you talk about the range of variance that we’ve seen this year, that’s really explained by just operational issues, downstream pipeline. Issues that we’ve had a couple of minor processing issues that we’ve had to deal with I call it “gas quality” issues that we’ve had to deal with so they’re really just the expected volume metric changes you’d just due to operational issues, normal operational issues. There has been no consistent decline issue. In fact, that basin, as you know, is very prolific, a lot of drilling going on. Really, the overall volume in the production and processing out of that area is really tied to the downstream capacity and there are a lot of projects that help improve that significantly. So, as I mentioned earlier in my formal comments, we’re excited about the opportunities that present themselves in Appalachia, simply because of all of the new capital that is being invested down hole, and the need for additional processing capabilities in that area. Hopefully that helps you.

 Jin Lu  - J.P. Morgan - Analyst

Appalachia

        Revenue.    Total revenue increased $3.9 million, or 7%, during the nine months ended September 30, 2007, compared to the corresponding period in 2006. The change was related to a 3,500 Gal/d increase in volumes and a $0.07 per gallon price increase at our Maytown facility, resulting in a $3.2 million increase in our revenue. We also incurred a $0.3 million increase in revenue associated with purging of the ALPS pipeline resulting from its shutdown in late 2006. These increases were partially offset by lower volumes at our Boldman facility caused by a temporary shutdown for maintenance and repair work during the first quarter of 2007.

        Purchased Product Costs.    Purchased product costs increased $6.2 million, or 19%, during the nine months ended September 30, 2007, compared to the corresponding period in 2006. The rise in costs is

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primarily a result of volumes and prices increasing at the Maytown facility, which accounted for $2.9 million of the overall increase. Trucking expenses associated with the shutdown of the ALPS pipeline added $3.0 million to the increase.

Appalachia

        Revenues.    Revenues increased 10% during the year ended December 31, 2005, relative to the comparable period in 2004 primarily as a result of price increases. An inlet volume decrease of $0.5 million offset this increase.

        Purchased Product Costs.    Purchased product costs increased 28% during the year ended December 31, 2005, relative to the comparable period in 2004 due to a price increase. The remainder of the increase is attributable to trucking costs of approximately $2.0 million incurred to transport product from our Maytown and Boldman plants to our Siloam fractionation plant as a result of the November 2004 pipeline failure.

        Facility Expenses.    Facility expenses increased 44% during the year ended December 31, 2005, relative to the comparable period in 2004, primarily due to $5.0 million of repairs and refurbishment costs.

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        Depreciation.    Depreciation expense decreased 26% during the year ended December 31, 2005, relative to the comparable period in 2004 due to accelerated Cobb plant depreciation recorded in 2004.

Appalachia

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        Revenue.    Total revenue increased $2.8 million, or 8%, during the six months ended June 30, 2007, compared to the corresponding period in 2006. The change was related to a 6,000 Gal/d increase in volumes and a $0.04 per gallon price increase at our Maytown facility, resulting in a $1.2 million increase in our revenue. We also experienced an increase in keep-whole gas volumes at the Cobb facility as well as increases in keep-whole gas liquid volumes at the Cobb and Kenova facilities in 2007. Finally, we incurred a $0.3 million increase in revenue associated with purging of the ALPS pipeline resulting from its shutdown in late 2006. These increases were partially offset by lower volumes at our Boldman facility caused by a temporary shutdown for maintenance and repair work.

        Purchased Product Costs.    Purchased product costs increased $4.2 million, or 21%, during the six months ended June 30, 2007, compared to the corresponding period in 2006. The rise in costs is primarily a result of volumes increasing by 6,000 Gal/d and prices increasing by $0.39 per gallon at the Maytown facility, which accounted for $1.9 million of the overall increase. Additionally, trucking expenses associated with the shutdown of the ALPS pipeline added $2.1 million to the increase.

Appalachia

        Revenues:    Total revenues increased $5.1 million, or 16%, during the six months ended June 30, 2006, relative to the comparable period in 2005. The increase was primarily a result of higher sales prices for our Maytown natural gas liquids in 2006. Higher gas and liquid volumes at the Cobb Plant and higher liquids volumes at the Boldman plant also contributed to the increase, however, such results are offset slightly by lower liquid volumes at Kenova and lower gas volumes at Boldman.

        Purchased Product Costs:    Purchased product costs increased $2.5 million, or 14%, during the six months ended June 30, 2006, relative to the comparable period in 2005. The rise in costs is primarily a result of higher product prices. The increase was partially offset by reduced trucking expenses, as we have been able to utilize our ALPS pipeline after repairs in 2005.

        Facility Expenses:    Facility expenses decreased $2.1 million, or 23%, during the six months ended June 30, 2006, relative to the comparable period in 2005. These expenses were higher in 2005 due to costs incurred to repair the ALPS pipeline.

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        Depreciation:    Depreciation expense increased $0.1 million, or 6%, during the six months ended June 30, 2006, relative to the comparable period in 2005, due to increased capitalized leasehold improvements associated with the ALPS pipeline.

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Appalachia

Appalachia

Appalachia