Exhibit 99.1

PostRock Reports Second Quarter Results

OKLAHOMA CITY – August 8, 2012 – PostRock Energy Corporation (NASDAQ: PSTR) today announced its second quarter 2012 results. Oil and gas revenues fell 50% from the prior-year period to $10.7 million. The decline paralleled a 51% drop in the Company’s realized gas price which averaged $2.06 per Mcf in the period. This price does not reflect the benefits of hedging which are included in Other Income. As substantially all gas development was suspended in September 2011 due to falling prices, gas production fell 11.1% from the prior-year period to an average of 45.2 MMcf a day. Oil production, which remains modest but is benefiting from current development efforts, increased 22.5% to an average of 265 Bbls a day. Gathering revenue fell by almost 70% to $474,000. More than two-thirds of the decline resulted from the royalty settlement. A further $125,000 can be tracked to the Company’s production decline and $175,000 related to a 26% reduction in third party volumes. Pipeline revenue rose 14.1% to $2.8 million as growing associated gas volumes from Osage County, OK increased throughput.

Realized hedging gains, including gains on settling June, July and August 2012 gas swaps, totaled $18.6 million for the quarter. Unfortunately, as the settlement was structured as a re-pricing, a portion of these gains were subsequently lost. Due to the declining unit price of Constellation Energy Partners (“CEP”) in the quarter, the Company recorded a mark-to-market loss of $6.6 million. In June 2012, a $5.7 million escrow related to a 2011 property sale was released. Of this amount, $1.3 million was retained by the Company and $4.4 million was paid to the Royal Bank of Canada. At June 30, 2012, a $564,000 escrow balance remained and is scheduled for release in December 2012. Only $164,000 of this will remain with PostRock.

Production costs, consisting of lease operating expenses, gathering costs and production taxes, totaled $10.7 million, a 6.2% decrease from the prior-year period. The decrease was in part due to field optimization projects. Labor, vehicle and equipment costs decreased $691,000 and gathering costs fell $470,000. A $702,000 reduction in production taxes also contributed. These reductions were offset by the absence of capitalized costs, increased workover expenses of $319,000 and increased maintenance expenses of $241,000 driven by April weather issues. Production costs totaled $2.51 an Mcfe, a 4.1% increase from the prior-year quarter. Pipeline operating expense totaled $765,000, a 43.7% decrease. The decrease was due to the timing of integrity tests and the elimination of a contractual payment to another pipeline that had been reduced in January 2011 and eliminated in October. General and administrative expenses totaled $3.9 million, a 24.7% decrease from the prior-year period. The decrease was primarily due to a $900,000 reduction in compensation costs and a $185,000 drop in legal fees.

In April, PostRock re-priced its June, July and August NYMEX gas swap contracts, raising $10.8 million. This was effected by selling hedges to help reduce its bank debt and simultaneously entering into new contracts. Since the transaction, the new contracts have experienced $1.6 million in losses. Of this amount, $476,000 rolled into 2016 hedges, $514,000 was paid in July and $617,000 in August. PostRock holds gas hedges covering 30 MMcf a day for the remainder of 2012 at an average price of $5.12 per Mcf and 25 MMcf a day in 2013 at an average price of $6.58 per Mcf. The fair value of these hedges at June 30, 2012

totaled $43.2 million. This value changes daily based on price fluctuations and monthly due to roll off of hedges. The following table summarizes the hedges at June 30, 2012.

Debt

At June 30, 2012, PostRock’s only debt was $167.4 million drawn on its bank facility. Debt decreased $11.7 million during the quarter. The reduction was largely funded with proceeds from settling June, July and August gas swaps. At August 8^th, debt totaled $161.8 million.

On June 1, 2012, the borrowing base was redetermined based on December 31, 2011 reserves. Values for the KPC pipeline and the 26.5% ownership in CEP were also included. Primarily as a result of lower gas prices and the roll off of hedges, the borrowing base was reduced $24 million to $176 million. Through the October 2012 redetermination, the borrowing base will decline $1 million a month. Additional interest at the rate of 1.5% is payable on borrowings above $120 million. The $120 million figure appears to be the lenders’ consensus on the value of a conforming borrowing base on proved reserves. With White Deer’s equity investment on August 1, 2012, the borrowing base was permanently reduced to $166.5 million. Given current gas prices, the Company does not anticipate having meaningful liquidity for some time without a refinancing. Working capital needs and capital expenditures are expected to be funded with cash flow from operations.

On August 1, 2012, White Deer invested a further $12 million in Company equity, comprised of 50% common and 50% preferred stock. Simultaneously, it extended the period during which PostRock may pay-in-kind the dividends on all preferred stock held by White Deer by 18 months to December 2014. Proceeds from the investment were used to reduce debt and provide working capital.

At June 30, 2012, PostRock elected to pay-in-kind the quarterly dividend to White Deer which increased the liquidation value of Series A Preferred Stock outstanding by $2.2 million to $74.0 million. White Deer also received 1.4 million additional warrants with a strike price of $1.56 a share. Following the investment and the June 30^th dividend, White Deer holds $80 million at liquidation preference of Series A Preferred, 26.7 million warrants exercisable at an average price of $3.00 a share and 5.3 million common shares.

Capital Expenditures

During the first half of 2012, capital expenditures totaled $9.2 million. This included $4.1 million spent on oil directed drilling and recompletions, $1.6 million to complete vehicle and equipment efficiency projects, $1.2 million to connect two sections of the gathering system, $1.8 million to complete facility and IT projects, $377,000 on KPC and $100,000 to extend leases.

Management Comment

Terry W. Carter, PostRock’s President and Chief Executive Officer, said, “Gas prices remain depressed and, despite the recent rebound, they remain at unprofitable levels. As a result, we are focused on retiring debt and reducing our cost structure. White Deer’s recent $12 million investment and extension of the PIK period on our Preferred was an important step in giving us time to return to profitability.”

“All drilling and development capital is currently being directed to oil projects. Since March, we have performed 30 Cherokee Basin recompletions. The projects are low cost and should not add significant operating costs. It appears the projects have a 50% success rate and, in aggregate including those that prove unsuccessful, a rate of return greater than 75% at current prices. During the quarter, we also drilled three oil wells in southeast Kansas at a combined cost of only $316,000. Production from the three averaged 20 net barrels a day for the first 30 days. We expect to pursue additional such opportunities shortly. Oil production has increased over 20% since last year. We plan ten to twelve workovers a month for the remainder of the year.”

“In June, our borrowing base was redetermined, dropping from $200 million to $176 million. At June 30, 2012, the outstanding balance became current as the facility expires on June 30, 2013. Recently, we have had discussions with a number of lenders and firms about a refinancing. We hope to have something to report on that front shortly.”

“KPC is continuing to slightly exceed expectations due to transportation contracts related to the development of the oil-rich Mississippian play. Volumes and revenues have increased while we have been successful at continuing to lower operating costs. Meanwhile, the strategic discussion about the pipeline continues.”

Webcast and Conference Call

PostRock will host its quarterly webcast and conference call tomorrow, Thursday, August 9, 2012, at 10:00 a.m. Central Time. The live webcast will be accessible on the ‘Investors’ page at www.pstr.com, where it will also be available for replay. The conference call number for participation is (866) 516-1003.

PostRock Energy Corporation is engaged in the acquisition, exploration, development, production and transportation of oil and natural gas, primarily in the Cherokee Basin of Kansas and Oklahoma. The Company owns and operates over 3,000 wells and nearly 2,200 miles of gas gathering lines in the Basin. It also owns and operates minor oil producing properties in Oklahoma, oil and gas producing properties in the Appalachian Basin and a 1,120 mile interstate natural gas pipeline, which transports natural gas from northern Oklahoma and western Kansas to Wichita and Kansas City.

Forward-Looking Statements

Opinions, forecasts, projections or statements, other than statements of historical fact, are forward-looking statements that involve risks and uncertainties. Forward-looking statements in this announcement are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Although the Company believes that the expectations reflected in such forward-looking statements are reasonable, it can give no assurance that such expectations will prove to be correct. Actual results may differ materially due to a variety of factors, some of which may not be foreseen by PostRock. These risks and other risks are detailed in the Company’s filings with the Securities and Exchange Commission, including risk factors listed in the Company’s Annual Report on Form 10-K and other filings with the SEC. The Company’s filings with the SEC may be found at www.pstr.com or www.sec.gov. By making these forward-looking statements, the Company undertakes no obligation to update these statements for revisions or changes after the date of this release.

Company Contact:

North Whipple

Director, Finance & Investor Relations

nwhipple@pstr.com

(405) 702-7423

Reconciliation of Non-GAAP Financial Measures

The following table represents a reconciliation of net income (loss) to EBITDA and adjusted EBITDA, as defined, for the periods presented.

Although adjusted EBITDA is not a measure of performance calculated in accordance with generally accepted accounting principles, or GAAP, management considers it an important measure of performance. Adjusted EBITDA is not a substitute for the GAAP measures of earnings or cash flow and is not necessarily a measure of the Company’s ability to fund its cash needs. In addition, it should be noted that companies calculate adjusted EBITDA differently, and therefore adjusted EBITDA as presented herein may not be comparable to adjusted EBITDA reported by other companies. Adjusted EBITDA has material limitations as a performance measure because it excludes, among other things, (a) interest expense, which is a necessary element of business to the extent that an entity incurs debt, (b) depreciation, depletion and amortization, which are necessary elements of any business that uses capital assets, (c) impairments of oil and gas properties, which may at times be a material element of an independent oil company’s business, and (d) income taxes, which may become a material element of the Company’s operations in the future. Because of its limitations, adjusted EBITDA should not be considered a measure of discretionary cash available to us to invest in the growth of PostRock’s business.

POSTROCK ENERGY CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)

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POSTROCK ENERGY CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

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