Harmony Files Definitive Proxy Statement, Schedules Stockholder Vote on NextDecade Merger for July 24

• Harmony Merger Corp. (NASDAQ: HRMN) (“Harmony”) filed a definitive
  proxy statement with U.S. Securities and Exchange Commission (“SEC”)
  on June 29, 2017
• Stockholder vote on business combination with NextDecade, LLC
  (“NextDecade”) set for July 24, 2017
• NextDecade is a liquefied natural gas (“LNG”) development company
  focused on LNG export projects in the State of Texas
• NextDecade’s Rio Grande LNG (“RGLNG”) project among most advanced
  second wave U.S. LNG export projects, optimally located in
  Brownsville, Texas in close proximity to associated gas from the
  Permian Basin and Eagle Ford Shale
• Following consummation of the Merger, NextDecade to be a publicly
  listed company (NASDAQ: NEXT)

NEW YORK & THE WOODLANDS, Texas–(BUSINESS WIRE)–Harmony, a publicly traded special purpose acquisition company, and
NextDecade jointly announced that Harmony has filed a definitive proxy
statement (Form DEFM14A) with the SEC on June 29, 2017. The definitive
proxy statement provides detailed information regarding Harmony’s
planned merger (the “Merger”) with NextDecade, an LNG development
company focused on LNG export projects in the State of Texas. The
definitive proxy statement also contains detailed information regarding
NextDecade’s commercial, engineering, regulatory, and gas supply
strategies, competitive advantages, rationale for the Merger, and
summary financial projections, among other information.

The special meeting of Harmony stockholders to consider the Merger will
be held on July 24, 2017 at 11:00 a.m. Eastern Time. All stockholders of
record of Harmony’s common stock as of the close of business on June 29,
2017 will be entitled to vote their shares at the special meeting. The
parties expect to consummate the Merger promptly after the meeting,
subject to approval of Harmony’s stockholders. Following the closing of
the Merger, NextDecade will be a publicly listed company on the NASDAQ
traded under the ticker symbol “NEXT”.

NextDecade’s first proposed LNG export facility, the RGLNG project
located in Brownsville, Texas, is optimally located in close proximity
to associated and stranded gas resources in the Permian Basin and Eagle
Ford Shale. RGLNG and its associated Rio Bravo Pipeline (“RBPL”),
originating in the Agua Dulce market area, are well-positioned among the
second wave of U.S. LNG projects.

About NextDecade, LLC

NextDecade, based in The Woodlands, Texas, is a developer of LNG
projects and associated pipelines in the State of Texas. NextDecade is
focused on providing customers around the world with flexible solutions
for low-cost, reliable LNG across the full value chain. Founded in 2010,
NextDecade has a team of industry leaders with extensive experience in
signing major LNG off-take deals, and developing and managing LNG, FLNG,
and FSRU projects, as well as associated natural gas and electricity
infrastructure around the world. Any development of its projects remains
contingent upon completing required commercial agreements; acquiring all
necessary permits and approvals; securing all financing commitments and
potential tax incentives; achieving other customary conditions; and
making a final investment decision to proceed. For more information,
please visit www.next-decade.com.

About Harmony Merger Corp.

Harmony Merger Corp. (NASDAQ: HRMN) was incorporated in Delaware on May
21, 2014 as a blank check company whose objective is to acquire, through
a merger, share exchange, asset acquisition, stock purchase,
recapitalization, reorganization or other similar business combination,
one or more businesses or entities. On March 27, 2015, Harmony
consummated its initial public offering (“IPO”) of 11,500,000 units,
each unit consisting of one share of common stock and one warrant to
purchase one common share, and a simultaneous private placement of units
to certain initial stockholders and Cantor Fitzgerald & Co., the
representative of the underwriters in the IPO. Pursuant to a definitive
merger agreement with NextDecade, as well as subsequent proxy materials
filed with the SEC, Harmony expects to consummate a merger with
NextDecade following a stockholder vote scheduled for July 24, 2017. For
more information, please visit www.harmonymergercorp.com.

CAUTIONARY INFORMATION ABOUT FORWARD-LOOKING STATEMENTS

This press release contains forward-looking statements within the
meaning of U.S. federal securities laws. The words “believe”, “expect”,
“intend”, “plan”, “potential”, and similar expressions are intended to
identify forward-looking statements, and these statements may relate to
the merger transaction. These statements involve a number of known and
unknown risks, which may cause actual results to differ materially from
expectations expressed or implied in the forward-looking statements.
These risks include uncertainties about NextDecade’s ability to complete
the Merger with Harmony; the development of the Rio Grande LNG export
project following completion of the merger; and other matters discussed
in the “Risk Factors” section of Harmony’s definitive proxy statement,
and any updates thereto in subsequent reports filed with the Securities
and Exchange Commission (the “SEC”). The forward-looking statements in
this press release speak as of the date of this release. Although
NextDecade and/or Harmony may from time to time voluntarily update prior
forward-looking statements, they disclaim any commitment to do so except
as required by securities laws.

IMPORTANT INFORMATION FOR STOCKHOLDERS

This communication does not constitute an offer to buy or sell or the
solicitation of an offer to buy or sell any securities or a solicitation
of any vote or approval. In connection with the proposed Merger, Harmony
filed and mailed to stockholders of record of Harmony a definitive proxy
statement on June 29, 2017. HARMONY STOCKHOLDERS ARE URGED TO READ THE
DEFINITIVE PROXY STATEMENT (INCLUDING ANY AMENDMENTS AND SUPPLEMENTS)
AND ANY OTHER MATERIALS THAT MAY BE FILED WITH THE SEC CAREFULLY AND IN
THEIR ENTIRETY IF AND WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL
CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED MERGER.

Harmony stockholders will be able to obtain free copies of these
documents (if and when available) and other documents containing
important information about Harmony and NextDecade, once such documents
are filed with the SEC, through the website maintained by the SEC at http://www.sec.gov.
Copies of the documents filed with the SEC by Harmony will be available
free of charge on Harmony’s internet website at www.harmonymergercorp.com
or by contacting Harmony using the contact information below.

PARTICIPANTS IN SOLICITATION

Harmony and its directors, executive officers and other members of its
management and employees may be deemed to be participants in the
solicitation of proxies from Harmony’s stockholders in connection with
the Merger. Stockholders are urged to carefully read the definitive
proxy statement, and any other related materials that may be filed with
the SEC when they become available, because they will contain important
information. Information regarding the persons who may, under the rules
of the SEC, be deemed participants in the solicitation of Harmony’s
stockholders in connection with the Merger is set forth in the
definitive proxy statement. Information about Harmony’s executive
officers and directors is set forth in the definitive proxy statement
relating to the Merger and stockholders are encouraged to read any
amendments or supplements to the definitive proxy statement and other
related materials filed with the SEC. You can obtain free copies of
these and other documents containing relevant information at the SEC’s
web site at www.sec.gov
or by directing a request to the address or phone number set forth under
Investors above.

Contacts

Investors
Height for NextDecade
Patrick Hughes,
+ 1 (202) 629 0004
phughes@heightllc.com
or
Harmony
Merger Corp.
David Sgro, + 1 (212) 319 7676
ds@harmonymergercorp.com
or
Media
Ward
for NextDecade
Molly LeCronier, +1 (713) 869 0707
MLeCronier@wardcc.com