The following table details additional information relating to reserve estimates as of and for the year ended December 31, 2015:

Note: Figures may not add due to rounding

In 2015, the Company’s reserve replacement ratio was negatively affected by net downward revisions of 4,083 Bcfe primarily as a result of the depressed commodity price environment.  The Company’s production volumes were partially offset with 592 Bcfe of proved reserve additions and 114 Bcfe of proved reserve additions as a result of acquisitions.  Of the reserve additions, 416 Bcfe were proved developed and 176 Bcfe were proved undeveloped.  In 2015, downward reserve revisions resulting from lower natural gas, oil and NGL prices totaled 2,315 Bcf, 1,875 Bcfe, 1,496 Bcf and 32 Bcfe in our Northeast Appalachia, Southwest Appalachia, Fayetteville Shale and other divisions, respectively.  Southwestern also had upward performance revisions in 2015 of 1,383 Bcf, 209 Bcfe, 10 Bcf and 33 Bcfe in its Northeast Appalachia, Southwest Appalachia, Fayetteville Shale and other divisions, respectively.  Additionally, our reserves decreased by 179 Bcfe as a result of our sale of natural gas and oil leases and wells in 2015.  Excluding price revisions, 240% of the Company’s production volumes were replaced with proved reserve additions, acquisitions and performance revisions.  For the period ending December 31, 2015, the Company’s three-year average reserve replacement ratio, including revisions and acquisitions, was 199%. Excluding reserve revisions and acquisitions, the Company’s three-year average reserve replacement ratio was 232%. 

The Company’s 2015 and three-year average finding and development costs, including performance revisions, were $0.61 and $0.62 per Mcfe, respectively, when excluding price revisions, acquisitions and the impact of capitalizing interest and portions of G&A costs in accordance with the full cost method of accounting (a non-GAAP financial measure computed below). Including price revisions, acquisitions and the impact of capitalizing interest and portions of G&A costs in accordance with the full cost method of accounting, the Company’s three-year average finding and development costs for the period ending December 31, 2015 was $2.40 per Mcfe.

The following table provides an overall and by category summary of the Company’s natural gas, oil and NGL reserves as of December 31, 2015 and sets forth 2015 annual information related to production and capital investments for each of its operating areas:

During 2015, Southwestern invested a total of $1.8 billion in its E&P business, excluding acquisition costs and post-closing adjustments for the Appalachia transactions that closed in December 2014 and January 2015 of $609 million, which included $500 million related to the Company’s E&P business and $109 million to Midstream Services. The Company participated in drilling 576 wells, placed 430 wells to sales, and had 203 wells which were in progress at year-end. Of the 203 wells in progress at year-end, 83, 43 and 77 were located in its Northeast Appalachia, Southwest Appalachia and Fayetteville Shale, respectively. Of the $1.8 billion invested in the Company’s E&P business in 2015, $547 million was invested in Northeast Appalachia, $520 million in Southwest Appalachia, $565 million in the Fayetteville Shale, $102 million in New Ventures and $21 million in E&P services.

Excluding the acquisitions announced in the fourth quarter of 2014, of the $1.8 billion invested in 2015, $1.2 billion was invested in exploratory and development drilling and workovers, $390 million in capitalized interest and other expenses, $107 million for acquisition of properties, and $6 million for seismic expenditures. Additionally, the Company invested $21 million in its drilling rig related equipment, sand facility and other equipment.

Northeast Appalachia – In 2015, Southwestern invested $710 million in Northeast Appalachia, which included $472 million to spud 89 operated wells and acquire 86 horizontal and 2 vertical wells. Total capital investments in Northeast Appalachia during 2015 also included $172 million for the acquisition of properties and $66 million in facilities, capitalized costs and other expenses.

Southwestern’s net gas production from Northeast Appalachia was 360 Bcf in 2015, up 42% from 254 Bcf in 2014. Gross operated production in Northeast Appalachia was 1,302 MMcf per day at the end of 2015 compared to approximately 1,020 MMcf per day at the end of 2014.

Total proved reserves in Northeast Appalachia were 2,319 Bcf as of December 31, 2015, compared to 3,192 Bcf at year-end 2014. The net decrease in reserves included downward price revisions of 2,315 Bcf and production of 360 Bcf, partially offset by upward reserve revisions due to well performance of 1,383 Bcf, reserve additions of 340 Bcf and acquisitions of 79 Bcf. The average gross proved reserves for the 36 undeveloped locations included in the Company’s 2015 year-end reserves was approximately 10.4 Bcf per well, compared to 9.6 Bcf per well for the 200 undeveloped locations as of December 2014.

In the fourth quarter of 2015, the average 30th-day rate was 5,601 Mcf per day on 33 wells that had an average lateral length of 5,429 feet and an average cost of $4.9 million per well.  This compares to an average 30th-day rate of 5,720 Mcf per day on 19 wells that had an average lateral length of 5,512 feet and an average cost of $5.5 million per well in the third quarter of 2015.  In 2015, for wells online with a 30th-day rate, Southwestern’s operated horizontal wells had an average completed well cost of $5.6 million per well and an average horizontal lateral length of 5,384 feet. This compares to an average completed operated well cost of $6.1 million per well and an average horizontal lateral length of 4,752 feet in 2014. 

As of December 31, 2015, Southwestern had spud or acquired 553 operated wells, of which 423 were horizontal and on production and 83 were in progress. Of the 423 operated horizontal wells on production, 139 were located in Bradford County, 25 were located in Lycoming County and 259 were located in Susquehanna County. Of the 83 wells in progress, 35 were either waiting on completion or waiting to be placed to sales, including 25 in Susquehanna County, 6 in Bradford County and 4 wells in Sullivan, Tioga and Wyoming Counties, combined.

The graph below provides normalized average daily production data through December 31, 2015, for the horizontal wells drilled by the Company in Northeast Appalachia. The “pink curve” summarizes results for 139 wells in Bradford County, the “blue curve” reflects results for 259 wells in Susquehanna County, the “orange curve” shows the results for 25 wells in Lycoming County and the “green curve” averages the results for the 146 wells that have been put on production within the last 18 months. As a reminder, the pressure drawdown in the reservoir, hence the production rates from all of the wells in Northeast Appalachia, are managed to maximize the ultimate recovery from the wells. The impact of this program is exhibited in all of the curves with the relatively flat production for the first 365 days before the wells begin normal declines. Furthermore, the Company continues to improve its completion design, and the performance history from the most recent wells is beginning to reflect these improvements. The normalized production curves are intended to provide a qualitative indication of the Company’s Northeast Appalachia wells’ performance and should not be used to estimate an individual well’s estimated ultimate recovery. The 8, 10 and 12 Bcf type curves are shown solely for reference purposes and are not intended to be projections of the performance of the Company’s wells.

At December 31, 2015, Southwestern held leases for approximately 270,335 net acres in Northeast Appalachia, compared to approximately 266,073 net acres at year-end 2014.

Southwest Appalachia – In 2015, Southwestern invested $857 million in Southwest Appalachia, which included $248 million to spud 48 operated wells. Total capital investments in Southwest Appalachia during 2015 also included $409 million for the acquisition of properties and $200 million in capitalized costs and other expenses. Net production from Southwest Appalachia was 143 Bcfe in 2015.

Total proved reserves in Southwest Appalachia were 611 Bcfe at year-end 2015, compared to 2,297 Bcfe in 2014. The net decrease in reserves included downward price revisions of 1,875 Bcfe and production of 143 Bcfe, partially offset by upward reserve revisions due to well performance of 209 Bcfe, reserve additions of 88 Bcfe and acquisitions of 35 Bcfe.

In 2015, the Company drilled 48 wells, with an average lateral length of 6,544 feet and average time to drill to total depth of 17.6 days from re-entry to re-entry. Additionally, Southwestern placed 47 wells on production. The Company again achieved better results by drilling in a tighter target interval, enhancing the completion design and utilizing pressure drawdown management.

For example, the Company placed 4 horizontal wells on production in Wetzel County where the average estimated ultimate recovery per 1,000 lateral feet was 2.9 Bcfe, or 95% higher than the offset wells drilled and completed by the previous operator, when normalized for lateral length. Another example is the Alice Edge pad, where 9 wells were brought online during the fourth quarter.  These wells combined for over 86,000 feet of completed lateral length and exhibited very strong performance with the pad having a peak rate of almost 50 million cubic feet per day of gas production and over 5 thousand barrels per day of condensate production.  Results from all of the wells brought online are shown in the table below.

In the fourth quarter of 2015, the Company drilled its first Utica well, the O. E. Burge located in Marshall County, West Virginia.  Despite operational challenges being faced similar to other Utica wells in the area, the Company was able to drill the well to its targeted 8,000 feet of lateral length and stayed in the target interval 100% of the time.  The Company is encouraged by the data observed during drilling and will report updates as they occur.

The Company had a total of 318 horizontal and 676 vertical wells that the Company operated and that were on production as of December 31, 2015.  Additionally, there were 43 horizontal wells in progress at the end of 2015, of which 21 were waiting on pipeline or production facilities. 

At December 31, 2015, Southwestern held leases for approximately 425,098 net acres in Southwest Appalachia, compared to approximately 413,376 net acres at year-end 2014.

Fayetteville Shale – In 2015, Southwestern invested $565 million in the Fayetteville Shale, which included $481 million to spud 155 wells, all of which were operated. Total capital investments in the Fayetteville Shale during 2015 also included $4 million for the acquisition of properties and $80 million in capitalized costs and other expenses.

Southwestern’s net gas production from the Fayetteville Shale was 465 Bcf in 2015, compared to 494 Bcf in 2014. Gross operated gas production in the Fayetteville Shale was approximately 1,759 MMcf per day at the end of 2015 compared to approximately 2,132 MMcf per day at the end of 2014.

Total proved reserves in the Fayetteville Shale were 3,281 Bcf at year-end 2015, compared to 5,069 Bcf in 2014. The net decrease in reserves included downward price revisions of 1,496 Bcf and production of 465 Bcf, partially offset by reserve additions of 163 Bcf and positive revisions of 10 Bcf due to well performance.  A total of 61 undeveloped locations were included in the 2015 year-end reserves at approximately 3.0 Bcf per well, compared to the 1,213 undeveloped locations at approximately 2.3 Bcf per well booked as of December 2014.

Southwestern’s operated horizontal wells had an average completed well cost of $2.8 million per well, average horizontal lateral length of 5,729 feet and average time to drill to total depth of 7.3 days from re-entry to re-entry in 2015. This compares to an average completed operated well cost of $2.6 million per well, average horizontal lateral length of 5,440 feet and average time to drill to total depth of 6.8 days from re-entry to re-entry in 2014.  Southwestern placed 261 operated wells on production during 2015 with average initial production rates of 4,280 Mcf per day, compared to 454 operated wells with average initial production rates of 4,430 Mcf per day in 2014. 

During the fourth quarter of 2015, the Company’s horizontal wells had an average initial production rate of 4,277 Mcf per day, average completed well cost of $2.8 million per well, average horizontal lateral length of 5,526 feet and average time to drill to total depth of 8.3 days from re-entry to re-entry. This compares to an average initial production rate of 3,886 Mcf per day, an average horizontal lateral length of 5,407 feet, average time to drill to total depth of 6.9 days from re-entry to re-entry and an average completed well cost of $2.7 million per well in the third quarter of 2015.

At December 31, 2015, Southwestern held leases for approximately 957,641 net acres in the Fayetteville Shale area, compared to approximately 888,161 net acres at year-end 2014. Certain acreage previously reported as a component of Southwestern’s conventional Arkoma Basin has been included in the unconventional net acreage for the Fayetteville Shale at December 31, 2015 reflecting the Company’s current drilling focus.

Explanation and Reconciliation of Non-GAAP Financial Measures

The Company reports its financial results in accordance with accounting principles generally accepted in the United States of America (“GAAP”). However, management believes certain non-GAAP performance measures may provide financial statement users with additional meaningful comparisons between current results and the results of its peers and of prior periods.  These non-GAAP performance measures often exclude items typically excluded by the investment community in published estimates to improve comparability.

One such non-GAAP financial measure is net cash provided by operating activities before changes in operating assets and liabilities. Management presents this measure because (i) it is accepted as an indicator of an oil and gas exploration and production Company’s ability to internally fund exploration and development activities and to service or incur additional debt, (ii) changes in operating assets and liabilities relate to the timing of cash receipts and disbursements which the Company may not control and (iii) changes in operating assets and liabilities may not relate to the period in which the operating activities occurred.

Additional non-GAAP financial measures the Company may present from time to time are adjusted net income, adjusted diluted earnings per share, adjusted EBITDA and its E&P and Midstream segment operating income, all which exclude certain charges or amounts. Management presents these measures because (i) they are consistent with the manner in which the Company’s performance is measured relative to the performance of its peers, (ii) these measures are more comparable to earnings estimates provided by securities analysts, and (iii) charges or amounts excluded cannot be reasonably estimated and guidance provided by the Company excludes information regarding these types of items. These adjusted amounts are not a measure of financial performance under GAAP.

See the reconciliations below of GAAP financial measures to non-GAAP financial measures for the three and twelve months ended December 31, 2015 and December 31, 2014. Non-GAAP financial measures should not be considered in isolation or as a substitute for the Company's reported results prepared in accordance with GAAP.

Finding and development costs – Finding and development (F&D) costs are computed by dividing acquisition, exploration and development capital costs incurred for the indicated period by reserve additions, including reserves acquired, for that same period. At times, adjustments are made to this calculation in order to improve usefulness for investors.  For example, price revisions are often excluded due to volatile commodity price changes.  Another example is the adjustment made to exclude the differences between accounting methods to improve comparability. The following computes F&D costs using information required by GAAP for the periods ending December 31, 2015 and 2014 and the three years ending December 31, 2015.  A breakdown is also shown detailing these amounts separately for Northeast Appalachia, Southwest Appalachia and the Fayetteville Shale.

The Company believes that providing a measure of F&D costs is useful for investors as a means of evaluating a Company’s cost to add proved reserves on a per thousand cubic feet of natural gas equivalent basis. These measures are provided in addition to, and not as an alternative for the financial statements, including the notes thereto, contained in Southwestern’s Annual Report. Due to various factors, including timing differences, F&D costs do not necessarily reflect precisely the costs associated with particular reserves. For example, exploration costs may be recorded in periods prior to the periods in which related acquisitions and increases in reserves are recorded and development costs, including future development costs for proved undeveloped reserve additions, may be recorded in periods subsequent to the periods in which related increases in reserves are recorded. In addition, changes in commodity prices can affect the magnitude of recorded increases in reserves independent of the related costs of such increases. As a result of the foregoing factors and various factors that could materially affect the timing and amounts of future increases in reserves and the timing and amounts of future costs, including factors disclosed in Southwestern’s filings with the SEC, future F&D costs may differ materially from those set forth above. Further, the methods used by Southwestern to calculate its F&D costs may differ significantly from methods used by other companies to compute similar measures and, as a result, Southwestern’s F&D costs may not be comparable to similar measures provided by other companies.

Southwestern management will host a teleconference call on Friday, February 26, 2016 at 10:00 a.m. EST to discuss its fourth quarter and year-end 2015 results. The toll-free number to call is 877-407-8035 and the international dial-in number is 201-689-8035. The teleconference can also be heard “live” on the Internet at http://www.swn.com.

Southwestern Energy Company is an independent energy company whose wholly-owned subsidiaries are engaged in natural gas and oil exploration, development and production, natural gas gathering and marketing. Additional information on the Company can be found on the Internet at http://www.swn.com.

This news release contains forward-looking statements. Forward-looking statements relate to future events and anticipated results of operations, business strategies, and other aspects of our operations or operating results. In many cases you can identify forward-looking statements by terminology such as “anticipate,” “intend,” “plan,” “project,” “estimate,” “continue,” “potential,” “should,” “could,” “may,” “will,” “objective,” “guidance,” “outlook,” “effort,” “expect,” “believe,” “predict,” “budget,” “projection,” “goal,” “forecast,” “target” or similar words. Statements may be forward looking even in the absence of these particular words. Where, in any forward-looking statement, the Company expresses an expectation or belief as to future results, such expectation or belief is expressed in good faith and believed to have a reasonable basis. However, there can be no assurance that such expectation or belief will result or be achieved. The actual results of operations can and will be affected by a variety of risks and other matters including, but not limited to, changes in commodity prices; changes in expected levels of natural gas and oil reserves or

production; operating hazards, drilling risks, unsuccessful exploratory activities; limited access to capital or significantly higher cost of capital related to illiquidity or uncertainty in the domestic or international financial markets; international monetary conditions; unexpected cost increases; potential liability for remedial actions under existing or future environmental regulations; potential liability resulting from pending or future litigation; and general domestic and international economic and political conditions; as well as changes in tax, environmental and other laws applicable to our business. Other factors that could cause actual results to differ materially from those described in the forward-looking statements include other economic, business, competitive and/or regulatory factors affecting our business generally as set forth in our filings with the Securities and Exchange Commission. Unless legally required, Southwestern Energy Company undertakes no obligation to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise.

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