Exhibit 99.1

CMS ENERGY ANNOUNCES FIRST QUARTER EARNINGS OF $0.59 PER SHARE, REAFFIRMS 2016 EARNINGS GUIDANCE OF $1.99 TO $2.02 PER SHARE

JACKSON, Mich., April 28, 2016 – CMS Energy announced today reported net income of $164 million, or $0.59 per share, for the first quarter of 2016, compared to reported net income of $202 million, or $0.73 per share, for the same quarter of 2015. Earnings per share in 2016 grew $0.12 or 20% compared with 2015 on a weather-normalized basis.

CMS Energy reaffirmed its guidance for 2016 adjusted earnings of $1.99 to $2.02 per share. This is consistent with the company’s 2016 plan of 5% to 7% annual adjusted earnings per share growth. Starting in 2017 CMS has increased its earnings per share guidance to 6% to 8% based on projected increases in capital investment.

First quarter results reflect the second warmest winter on record which decreased gas deliveries and electric sales, and greater storm activity which increased service restoration expenses. The company continues to execute its business plan, with a focus on safety, customer service, reliability, affordability and environmental stewardship.

John Russell, CMS Energy’s president and chief executive officer, said that CMS Energy’s principal subsidiary, Consumers Energy, is improving its environmental performance with the retirement earlier this month of its seven oldest coal plants. The company has retired a higher percentage of its coal plants than any investor owned utility in the U.S., resulting in major improvements in air quality and a large reduction in water usage. Electric rates dropped by $38 million with the retirement of the coal plants.

“We’re earning a well-deserved reputation as one of the leading sustainable energy providers focused on environmental stewardship,” said Russell. “While executing our business plan and keeping our promises, we’re also exceeding requirements for renewable energy and reducing our carbon footprint by 25%.”  Recently the gas-fired Jackson Generating Station, purchased at one-quarter the cost of building a new plant, and the community Solar Garden at Grand Valley State University began serving customers.

This month the company reduced its natural gas commodity price to the lowest level since 1998 and more than 60 percent compared to a decade ago. Consumers Energy has the lowest gas commodity costs among Michigan gas utilities.

Electric customers continue to see improved reliability based on company investments. Service restoration has improved by nearly 20% compared to 5 years ago for outages outside of major storms.

CMS Energy (NYSE: CMS) is a Michigan-based company that has an electric and natural gas utility, Consumers Energy, as its primary business and also owns and operates independent power generation businesses.

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CMS Energy will hold a webcast to discuss its 2016 first quarter results and provide a business and financial outlook on April 28 at 8:30 AM (EDT).  To participate in the Webcast, go to CMS Energy’s home page (www.cmsenergy.com) and select “Investor Meeting.”

This news release contains non-Generally Accepted Accounting Principles (non-GAAP) measures, such as adjusted earnings. Management views adjusted earnings as a key measure of the company’s present operating financial performance, unaffected by discontinued operations, asset sales, impairments, regulatory items from prior years, or other items detailed in the attached summary financial statements. These items have the potential to impact, favorably or unfavorably, the company’s reported earnings.

This news release contains “forward-looking statements.” The forward-looking statements are subject to risks and uncertainties that could cause CMS Energy’s and Consumers Energy’s results to differ materially. All forward-looking statements should be considered in the context of the risk and other factors detailed from time to time in CMS Energy’s and Consumers Energy’s Securities and Exchange Commission filings.

Investors and others should note that CMS Energy routinely posts important information on its website and considers the Investor Relations section, www.cmsenergy.com/investor-relations, a channel of distribution.

For more information on CMS Energy, please visit our website at www.cmsenergy.com. To sign up for email alert notifications, please visit the Investor Relations section of our website.

Media Contacts: Dan Bishop, 517/788-2395 or Brian Wheeler, 517/788-2394

Investment Analyst Contact:  CMS Energy Investor Relations, 517/788-2590

CMS Energy Corporation

SUMMARIZED CONSOLIDATED STATEMENTS OF INCOME

(In Millions, Except Per Share Amounts)

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CMS Energy Corporation

SUMMARIZED CONSOLIDATED BALANCE SHEETS

(In Millions)

(*) Current and long-term

CMS Energy Corporation

SUMMARIZED STATEMENTS OF CASH FLOWS

(In Millions)

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CMS Energy Corporation

SUMMARY OF CONSOLIDATED EARNINGS

Reconciliations of GAAP Net Income to Non-GAAP Adjusted Net Income

(In Millions, Except Per Share Amounts)

Note:    Management views adjusted (non-Generally Accepted Accounting Principles) earnings as a key measure of the Company’s present operating financial performance, unaffected by discontinued operations, asset sales, impairments, regulatory items from prior years, or other items detailed in these summary financial statements.

* Less than $500 thousand or $0.01 per share.

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