Digital Realty Decreases Data Center Cooling Energy Usage By 66%

       Digital Realty Decreases Data Center Cooling Energy Usage By 66%

Energy Management Software and Variable Speed Fans Dramatically Reduce Carbon
Emissions, PUE

PR Newswire

SAN FRANCISCO, Dec. 12, 2012

SAN FRANCISCO, Dec. 12, 2012 /PRNewswire/ -- Digital Realty Trust, Inc. (NYSE:
DLR), Vigilent^® Corporation, and Lawrence Berkeley National Laboratory today
announced the results of a joint study focused on improving the energy
efficiency of a data center designed, owned and operated by Digital Realty.

The facility used for this initiative was Digital Realty's 135,000 square foot
data center located in El Segundo, California. Lawrence Berkeley National
Laboratory monitored the overall effort, creating the baseline and result
metrics, and acted as project manager for the energy efficiency grant awarded
by the California Energy Commission's PIER Program. The results of this
project were presented at the Silicon Valley Leadership's Data Center Summit
hosted by AMD on October 24, 2012.

The project focused on replacing constant speed scroll fans with
electronically commutated motor (ECM) variable speed fans of a more efficient
design and deploying the Vigilent Intelligent Energy Management™ system to
control fan speeds and computer room air handler (CRAH) output. The full
report – "Demonstration of Intelligent Control and Fan Improvements in
Computer Room Air Handlers" - is available on Lawrence Berkeley National
Laboratory's website (http://hightech.lbl.gov/datacenter-wireless-control/).

"The goal of the study was to assess whether the fan speed control system was
a viable solution for commercial data centers," said Jim Smith, Chief
Technology Officer at Digital Realty. "We found that upgrading fans and adding
fan speed controls in our data centers allow us to cool them more effectively
and efficiently. In addition, the facility's electrical energy usage was
reduced, as was the average and peak electric power demand, resulting in a
more energy efficient and sustainable data center environment."

Key Findings

Deployment of Vigilent's sophisticated software system combined with changes
to the data center operations resulted in a 66% drop in cooling energy usage
at Digital Realty's El Segundo facility, freeing stranded capacity while
simultaneously expanding reserve cooling capacity. In addition, the software
provided visibility into data center thermal conditions, which led to
additional energy savings as well as a significantly improved temperature
distribution. Furthermore, the El Segundo facility's PUE (power usage
effectiveness) was improved by 8% to 1.46; 2.9 million kilowatt hours will be
saved annually; and greenhouse gas emissions of carbon dioxide will be reduced
by 1.9 million pounds per year as a result of the software and data center
improvements.

"Gaining capacity from existing equipment is a competitive advantage for data
center owners and operators," said Christopher Kryzan, Vice President of
Marketing at Vigilent. "The ability, at any moment, to see exactly how much
capacity you have in reserve along with the ability to instantly deploy it,
allows for a flexible, resilient data center and optimizes the use of valuable
resources."

Repeatable, Scalable Model

"Operational efficiency and thermal performance benefits are immediately
available with existing technologies," said Bill Tschudi, a program manager at
Lawrence Berkeley National Laboratory. "We believe the energy savings achieved
through infrastructure improvements combined with a powerful monitoring and
control system is a repeatable, scalable model for data centers everywhere,
and the kind of improvement we are encouraging the industry to attain."

About Digital Realty

Digital Realty Trust, Inc. focuses on delivering customer driven data center
solutions by providing secure, reliable and cost effective facilities that
meet each customer's unique data center needs. Digital Realty's customers
include domestic and international companies across multiple industry
verticals ranging from information technology and Internet enterprises, to
manufacturing and financial services. Digital Realty's 110 properties,
excluding three properties held as investments in unconsolidated joint
ventures, comprise approximately 21.2 million square feet as of October 26,
2012, including 2.2 million square feet of space held for redevelopment.
Digital Realty's portfolio is located in 32 markets throughout Europe, North
America, Asia and Australia. Additional information about Digital Realty is
included in the Company Overview, which is available on the Investors page of
Digital Realty's website at http://www.digitalrealty.com.

About Vigilent^® Corporation

Vigilent^® Corporation (vigilent.com) is the leader in intelligent energy
management systems, an essential solution for data center infrastructure
management (DCIM). The company applies advanced Intelligent Analytics™
technology to address the real-time energy demands of data centers, colocation
providers, telecommunications facilities, and large buildings. Vigilent
protects uptime through dynamic management of cooling resources, while
delivering significant, immediate reductions in cooling energy costs and
carbon emissions through automated 24/7 monitoring and control of
mission-critical facilities. A privately-held firm located in San Francisco's
East Bay, Vigilent is committed to green energy solutions that reduce and
inform energy use, making for a more sustainable planet.

About Lawrence Berkeley National Laboratory

Lawrence Berkeley National Laboratory (Berkeley Lab) is a member of the
national laboratory system supported by the U.S. Department of Energy through
its Office of Science. It is managed by the University of California (UC) and
is charged with conducting unclassified research across a wide range of
scientific disciplines. Located on a 200-acre site in the hills above the UC
Berkeley campus that offers spectacular views of the San Francisco Bay,
Berkeley Lab employs approximately 4,200 scientists, engineers, support staff
and students.

Berkeley Lab's extensive research and demonstrations related to data center
energy efficiency is supported by numerous public interest programs including
DOE, the California Energy Commission, NYSERDA, and others. Berkeley Lab
supports the Silicon Valley Leadership Group's annual data center summit where
the project described herein was presented.

Safe Harbor Statement

This press release contains forward-looking statements which are based on
Digital Realty Trust, Inc.'s current expectations, forecasts and assumptions
that involve risks and uncertainties that could cause actual outcomes and
results to differ materially, including statements related to the joint study
on improving energy efficiency, expectations based on the results of the
study, and estimated improvements in PUE and estimated savings in kilowatt
hours and greenhouse gas emissions at Digital Realty's El Segundo facility.
These risks and uncertainties include, among others, the following: the impact
of the recent deterioration in global economic, credit and market conditions,
including the downgrade of the U.S. government's credit rating; current local
economic conditions in its geographic markets; decreases in information
technology spending, including as a result of economic slowdowns or recession;
adverse economic or real estate developments in its industry or the industry
sectors that it sells to (including risks relating to decreasing real estate
valuations and impairment charges); its dependence upon significant tenants;
bankruptcy or insolvency of a major tenant or a significant number of smaller
tenants; defaults on or non-renewal of leases by tenants; its failure to
obtain necessary debt and equity financing; increased interest rates and
operating costs; risks associated with using debt to fund its business
activities, including re-financing and interest rate risks, its failure to
repay debt when due, adverse changes in its credit ratings or its breach of
covenants or other terms contained in its loan facilities and agreements;
financial market fluctuations; changes in foreign currency exchange rates; its
inability to manage its growth effectively; difficulty acquiring or operating
properties in foreign jurisdictions; its failure to successfully integrate and
operate acquired or redeveloped properties or businesses; risks related to
joint venture investments, including as a result of its lack of control of
such investments; delays or unexpected costs in development or redevelopment
of properties; decreased rental rates or increased vacancy rates; increased
competition or available supply of data center space; its inability to
successfully develop and lease new properties and space held for
redevelopment; difficulties in identifying properties to acquire and
completing acquisitions; its inability to acquire off-market properties; its
inability to comply with the rules and regulations applicable to reporting
companies; its failure to maintain its status as a REIT; possible adverse
changes to tax laws; restrictions on its ability to engage in certain business
activities; environmental uncertainties and risks related to natural
disasters; losses in excess of its insurance coverage; changes in foreign laws
and regulations, including those related to taxation and real estate ownership
and operation; and changes in local, state and federal regulatory
requirements, including changes in real estate and zoning laws and increases
in real property tax rates. For a further list and description of such risks
and uncertainties, see the reports and other filings by Digital Realty Trust,
Inc. with the U.S. Securities and Exchange Commission, including Digital
Realty Trust, Inc.'s Annual Report on Form 10-K for the year ended December
31, 2011 and Quarterly Reports on Form 10-Q for the quarters ended March 31,
2012, June 30, 2012 and September 30, 2012. Digital Realty Trust, Inc.
disclaims any intention or obligation to update or revise any forward-looking
statements, whether as a result of new information, future events or
otherwise.

For Additional Information:
A. William Stein            Pamela M. Garibaldi
Chief Financial Officer and Vice President, Investor Relations and
Chief Investment Officer    Corporate Marketing
Digital Realty Trust, Inc.  Digital Realty Trust, Inc.
+1 (415) 738-6500           +1 (415) 738-6500
Pam Crowley                 William Tschudi
Vigilent^® Corporation      Program Manager
+1 (408) 529-9655           Lawrence Berkeley National Laboratory
pcrowley@vigilent.com       +1 (510) 495-2417

SOURCE Digital Realty Trust, Inc.

Website: http://www.digitalrealtytrust.com
Website: http://vigilent.com
 
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