Columbia Gas of Maryland Files to Recover Investment in Replacing Aging Infrastructure

If the adjustment is approved by the PSC, the average total bill for a residential customer who purchases 70 therms of gas per month from Columbia Gas would increase from $84.24 to $98.17 (16.54 percent increase). The average total bill for a small commercial customer who purchases 240 therms of gas per month from Columbia Gas would increase from $284.31 to $322.29 (13.36 percent increase). The average total bill for an industrial customer who purchases 3,660 therms of gas per month from Columbia Gas would increase from $3,190.45 to $3,205.86 (0.48 percent increase).

Columbia Gas Director of Rates and Regulatory Affairs Adam Lanier noted, "The impact on the customer's bill associated with this filing is softened thanks to continued low, stable natural gas costs. On behalf of our customers, we work with suppliers to secure the best possible natural gas prices, while maintaining the reliability of gas supply during peak demand periods."

Gas costs generally represent about a quarter of a residential customer's total bill. Columbia Gas purchases its gas on the wholesale market and under Maryland law, passes these costs on to its customers without mark-up or profit. The gas cost portion of a residential customer's monthly bill is based entirely on their home's monthly gas consumption.

The process for a general rate proceeding before the PSC can take up to nine months and Columbia Gas expects that new rates would be effective at the end of 2017. Customers with questions regarding the proposal may call 1-888-460-4332 or visit www.ColumbiaGasMd.com for more information.

About Columbia Gas of Maryland
Columbia Gas of Maryland delivers clean, affordable, and efficient natural gas to approximately 33,000 customers in Garrett, Allegany and Washington counties. It is one of NiSource's seven regulated utility companies. NiSource (NYSE: NI) is one of the largest fully-regulated utility companies in the United States, serving approximately 3.5 million natural gas customers and 500,000 electric customers through its local Columbia Gas and NIPSCO brands. More information about Columbia Gas of Maryland is available at www.ColumbiaGasMD.com.

About NiSource
NiSource Inc. (NYSE: NI) is one of the largest fully-regulated utility companies in the United States, serving approximately 3.5 million natural gas customers and 500,000 electric customers across seven states through its local Columbia Gas and NIPSCO brands. Based in Merrillville, Indiana, NiSource's approximately 8,000 employees are focused on safely delivering reliable and affordable energy to our customers and communities we serve. NiSource has been designated a World's Most Ethical Company by the Ethisphere Institute since 2012 and is a member of the Dow Jones Sustainability – North America Index. Additional information about NiSource, its investments in modern infrastructure and systems, its commitments and its local brands can be found at www.nisource.com. Follow us at www.facebook.com/nisource, www.linkedin.com/company/nisource or www.twitter.com/nisourceinc. NI-F

Forward-Looking Statements
This press release contains forward-looking statements within the meaning of federal securities laws. Investors and prospective investors should understand that many factors govern whether any forward-looking statement contained herein will be or can be realized. Any one of those factors could cause actual results to differ materially from those projected. Examples of forward-looking statements in this press release include statements and expectations regarding NiSource's business, performance, growth, investment opportunities, and planned, identified, infrastructure or utility investments. All forward-looking statements are based on assumptions that management believes to be reasonable; however, there can be no assurance that actual results will not differ materially. Factors that could cause actual results to differ materially from the projections, forecasts, estimates, plans, expectations and strategic discussed in this news release include, among other things, NiSource's debt obligations; any changes in NiSource's credit rating; NiSource's ability to execute its growth strategy; changes in general economic, capital and commodity market conditions; pension funding obligations; economic regulation and the impact of regulatory rate reviews; NiSource's ability to obtain expected financial or regulatory outcomes; any damage to NiSource's reputation; compliance with environmental laws and the costs of associated liabilities; fluctuations in demand from residential and commercial customers; economic conditions of certain industries; the success of NIPSCO's electric generation strategy; the price of energy commodities and related transportation costs; the reliability of customers and suppliers to fulfill their payment and contractual obligations; potential impairments of goodwill or definite-lived intangible assets; changes in taxation and accounting principles; potential incidents and other operating risks associated with our business; the impact of an aging infrastructure; the impact of climate change; potential cyber-attacks; construction risks and natural gas costs and supply risks; extreme weather conditions; the attraction and retention of a qualified work force; advances in technology; the ability of NiSource's subsidiaries to generate cash; uncertainties related to the expected benefits of the Separation and other matters set forth in Item 1A, "Risk Factors" section of NiSource's Annual Report on Form 10-K for the fiscal year ended December 31, 2016 and in other filings with the Securities and Exchange Commission. NiSource expressly disclaims any duty to update, supplement or amend any of its forward-looking statements contained in this press release, whether as a result of new information, subsequent events or otherwise, except as required by applicable law.

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SOURCE NiSource Inc.