JOINT FILING AGREEMENT
EXHIBIT 99.1
In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the
undersigned agree to the joint filing on behalf of each of them of a Statement on Schedule 13G
(including any and all amendments thereto) with respect to the Common Stock, par value $0.01 per
share, of PostRock Energy Corporation, a Delaware corporation, and further agree that this Joint
Filing Agreement shall be included as an Exhibit to such joint filings.
The undersigned further agree that each party hereto is responsible for the timely filing of
such Statement on Schedule 13G and any amendments thereto, and for the accuracy and completeness of
the information concerning such party contained therein; provided, however, that no party is
responsible for the accuracy or completeness of the information concerning any other party, unless
such party knows or has reason to believe that such information is inaccurate.
This Joint Filing Agreement may be signed in counterparts with the same effect as if the
signature on each counterpart were upon the same instrument.
IN WITNESS WHEREOF, the undersigned have executed this Agreement as of February 17, 2011.
| XXXXXXX MLP OPPORTUNITY FUND I, LP |
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| By: Swank Energy Income Advisors, LP (n/k/a Xxxxxxx MLP Asset Management, LP), its investment adviser | ||||
| By: | Swank Capital, L.L.C., its general partner | |||
| By: | /s/ Xxxxx X. Xxxxx | |||
| Xxxxx X. Xxxxx | ||||
| Managing Member | ||||
| SWANK CAPITAL, L.L.C. |
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| By: | /s/ Xxxxx X. Xxxxx | |||
| Xxxxx X. Xxxxx | ||||
| Managing Member | ||||
| SWANK ENERGY INCOME ADVISORS, LP (N/K/A XXXXXXX MLP ASSET MANAGEMENT, LP) |
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| By: | Swank Capital, L.L.C., its general partner | |||
| By: | /s/ Xxxxx X. Xxxxx | |||
| Xxxxx X. Xxxxx | ||||
| Managing Member | ||||
| /s/ Xxxxx X. Xxxxx | ||||
| Xxxxx X. Xxxxx | ||||
