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Zayo Purchases Renewable Energy to Power Five Data Centers

Press Release

|July 5, 2017

EPA recognizes Zayo for leading green power use

BOULDER, Colo. – Zayo
Group Holdings
, Inc. (NYSE:ZAYO) announced that it has purchased 86
million kilowatt hours of renewable energy certificates to power five of
its zColo data centers in Illinois, Texas and New Jersey. The purchase
is part of Zayo’s new emphasis on sustainability, which includes the
support of green, renewable energy alternatives. The renewable energy
certificate program is expected to result in significant annual savings.

As a result of Zayo’s purchase, the company is now an EPA
Green Power Partner
. Green power is zero-emissions electricity that
is generated from environmentally preferable renewable resources, such
as wind, solar, geothermal, biogas, eligible biomass and low-impact
hydro. Using green power helps accelerate the development of new
renewable energy capacity nationwide and helps users reduce their carbon
footprints.

“EPA applauds Zayo Group Holdings for its commitment to using green
power and helping to reduce greenhouse gas emissions,” said James
Critchfield, program manager of EPA’s Green Power Partnership. “Zayo is
demonstrating leadership by furthering the case for accessible,
affordable green power use and provides an excellent example for other
businesses in the tech and telecom sector.”

“Sustainability is aligned with our values at Zayo and addresses our
customers’ requests for green power and other environmentally
responsible practices,” said TJ Karklins, senior vice president of
Zayo’s zColo business segment. “This initiative represents a vital next
step in our long-term commitment to sustainability.”

zColo also has other projects underway in its 46 data centers to improve
efficiency and reduce energy consumption, including upgraded power and
HVAC components, airflow management upgrades, lighting retrofits and
other improvements.

For more information about zColo, please visit zayo.com.

About Zayo Group

Zayo Group Holdings, Inc. (NYSE:ZAYO) provides communications
infrastructure services, including fiber and bandwidth connectivity,
colocation and cloud infrastructure to the world’s leading businesses.
Customers include wireless and wireline carriers, media and content
companies and finance, healthcare and other large enterprises. Zayo’s
122,000-mile network in North America and Europe includes extensive
metro connectivity to thousands of buildings and data centers. In
addition to high-capacity dark fiber, wavelength, Ethernet and other
connectivity solutions, Zayo offers colocation and cloud infrastructure
in its carrier-neutral data centers. Zayo provides clients with
flexible, customized solutions and self-service through Tranzact, an
innovative online platform for managing and purchasing bandwidth and
services. For more information, visit zayo.com.

About EPA’s Green Power Partnership

The Green Power Partnership is a voluntary program that encourages
organizations to use green power as a way to reduce the environmental
impacts associated with electricity use. The Partnership currently has
more than 1,400 Partner organizations voluntarily using billions of
kilowatt-hours of green power annually. Partners include a wide variety
of leading organizations such as Fortune 500® companies; small and
medium sized businesses; local, state, and federal governments; and
colleges and universities. For additional information, please visit www.epa.gov/greenpower.

Forward Looking Statements

This press release contains a number of forward-looking statements.
Words, and variations of words such as “believe,” “expect,” “plan,”
“continue,” “will,” “should,” and similar expressions are intended to
identify our forward-looking statements. No assurance can be given that
future results expressed or implied by the forward-looking statements
will be achieved and actual results may differ materially from those
contemplated by the forward-looking statements. These forward-looking
statements involve risks and uncertainties, many of which are beyond our
control. For additional information on these and other factors that
could affect our forward-looking statements, see our risk factors, as
they may be amended from time to time, set forth in our filings with the
SEC, including our 10-K dated August 25, 2016. We disclaim and do not
undertake any obligation to update or revise any forward-looking
statement in this press release, except as required by applicable law or
regulation.

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Zayo Group Holdings, Inc.
Media:
Shannon Paulk,
303-577-5897
Corporate Communications
press@www.zayo.com
or
Investors:
Brad
Korch, 720-306-7556
Investor Relations
IR@www.zayo.com