Exhibit 99.1

July 26, 2013

NV Energy Reports Financial Results for Second Quarter 2013; Earnings Guidance Reaffirmed

Highlights:

LAS VEGAS, July 26, 2013 – NV Energy, Inc. (NYSE: NVE) today announced financial results for the three and six months ended June 30, 2013 as shown in the table below.

Key factors benefiting earnings for the second quarter of 2013 compared to the same period a year ago included:

Factors offsetting these benefits in the second quarter included costs related to the planned merger with MidAmerican Energy Holdings, a subsidiary of Berkshire Hathaway ($13.6 million pre-tax, or $0.04 per share after tax). For further information regarding drivers of financial results, see the earnings report to the financial community posted on www.nvenergy.com.

“During the second quarter, we announced plans to merge with MidAmerican Energy, and the Nevada State Legislature passed a law to reduce reliance on coal plants,” said Michael Yackira, president and chief executive officer of NV Energy, Inc. “As we move forward, we will continue to control costs while keeping an unwavering focus on our top priority: serving our customers with safe, reliable, affordable energy.”

Earnings Guidance

“With summer still underway, and third quarter weather a key variable for this year’s results, we are making no changes to our guidance range at present,” Yackira said. “We expect to earn between $1.25 and $1.35 per share for the year 2013.” Earnings guidance assumes normal weather in the second half of the year and includes costs related to the MidAmerican merger.

Webcast Scheduled for 7 a.m. PDT today, Friday, July 26, 2013

Senior management will review the company’s financial performance and outlook during a conference call and live webcast today, Friday, July 26 at 7 a.m. Pacific Daylight Time. The webcast will be accessible on the NV Energy website at www.nvenergy.com. A taped replay will remain on the company’s website for approximately 30 days. To listen to the replay by telephone, call (800) 475-6701. International callers should dial (320) 365-3844. Use the conference call access code: 296454.

NV Energy

Headquartered in Las Vegas, NV Energy, Inc. is a holding company whose principal subsidiaries, Nevada Power Company and Sierra Pacific Power Company, are doing business as NV Energy. Serving a combined service territory of nearly 46,000 square miles, NV Energy provides a wide range of energy services and products to approximately 2.4 million residents of Nevada and nearly 40 million tourists annually.

Forward-Looking Statements

This press release may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 regarding the future performance of NV Energy, Inc. and its subsidiaries, Nevada Power Company and Sierra Pacific Power Company both d/b/a NV Energy. Forward-looking statements include earnings guidance and estimates or forecasts of operating and financial metrics. These statements reflect current expectations of future conditions and events and as such are subject to a variety of risks, uncertainties and assumptions that could cause actual results to differ materially from current expectations. These risks, uncertainties and assumptions include, but are not limited to, the risk that the transaction between NV Energy, Inc. and MidAmerican will not be consummated due to a failure to satisfy the closing conditions to the transaction, including the approval of the transaction by NV Energy Inc.’s shareholders and the receipt of certain regulatory approvals on the proposed terms and schedules contemplated by the parties, including, among other regulatory approvals, approvals from the Public Utilities Commission of Nevada and the Federal Energy Regulatory Commission; the risk that an event, effect or change occurs that gives rise to a termination of the definitive agreement entered into with MidAmerican; the risk that NV Energy Inc. or MidAmerican will be unable to perform certain obligations under the transaction agreements; the risk relating to unanticipated difficulties and/or expenditures relating to the transaction; the risk that legal proceedings against NV Energy, Inc. and others related to the definitive agreement entered into with MidAmerican will be successful; the risk that the proposed transaction disrupts current plans and operations and creates potential difficulties in employee retention; and the impact of delay or failure to complete the merger with MidAmerican on NV Energy, Inc.’s common stock price. Other factors outside the control of NV Energy, Inc., include, but are not limited to, NV Energy Inc.’s ability to maintain access to the capital markets, NV Energy, Inc.’s ability to receive dividends from its subsidiaries, the financial performance of NV Energy, Inc.’s subsidiaries, particularly Nevada Power Company and Sierra Pacific Power Company both d/b/a NV Energy, and the discretion of NV Energy, Inc.’s Board of Directors with respect to the payment of future dividends based on its periodic review of factors that ordinarily affect dividend policy, such as current and prospective financial condition, earnings and liquidity, prospective business conditions, regulatory factors, and dividend restrictions in NV Energy, Inc.’s and its subsidiaries’ financing agreements. For Nevada Power Company and Sierra Pacific Power Company both d/b/a NV Energy, these risks and uncertainties include, but are not limited to, future economic conditions, changes in the rate of industrial, commercial and residential growth in their service territories, their ability to procure sufficient renewable energy sources in each compliance year to satisfy the Nevada Renewable Energy Portfolio Standard, the effect of future or existing Nevada or federal laws or regulations affecting the electric industry, changes in environmental laws and regulations, construction risks, including but not limited to those associated with the ON Line project, their ability to maintain access to the capital markets for general corporate purposes and to finance construction projects, employee workforce factors, unseasonable weather, drought, wildfire and other natural phenomena, explosions, fires, accidents, vandalism, or mechanical breakdowns that may occur while operating and maintaining an electric and natural gas system, their ability to purchase sufficient fuel, natural gas and power to meet their power demands and natural gas demands for Sierra Pacific Power Company d/b/a NV Energy, financial market conditions, and unfavorable rulings, penalties or findings in their rate or other cases. Further risks, uncertainties and assumptions that may cause actual results to differ from current expectations pertain to weather conditions, customer and sales growth, plant outages, operations and maintenance expense, depreciation and allowance for funds used during construction, interest rates and expense, cash flow and regulatory matters. Additional cautionary statements regarding other risk factors that could have an effect on the future performance of NV Energy, Inc., Nevada Power Company and Sierra Pacific Power Company both d/b/a NV Energy are contained in their Annual Reports on Form 10-K for the year ended December 31, 2012, and quarterly reports on Form 10-Q for the period ended March 31, 2013, filed with the Securities and Exchange Commission. NV Energy, Inc., Nevada Power Company and Sierra Pacific Power Company both d/b/a NV Energy undertake no obligation to release publicly the result of any revisions to these forward-looking statements that may be made to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

NV ENERGY, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Dollars in Thousands, Except Share Amounts)

(Unaudited)