IEEE Electrification Magazine - June 2016 - 7

Figure 2. A conceptual image of the Sikorsky CH-54b Skycrane.
(Image licensed from: http://www.turbosquid.com/3d-models/
sikorsky-ch-54b-skycrane-helicopter-max/691548 by Dan Gregory.)

for higher power and voltages. A recent study by the
Pew Charitable Trusts estimates that 80% of the population of sub-Saharan Africa carries a cell phone, and
another study by the World Bank shows that only 24%
of the same population has access to electricity. The
remaining population is likely getting power from batteries, as described above, but this also speaks to the
level of off-grid telecommunications towers in the
region. The telecommunications industry has established its own standards for dc voltages, such as the
380-Vdc standard ETSI-EN-300, and powers much of
its own equipment using small dc microgrids.

Data Centers
The data center market is expected to grow from
US$14.59 billion in 2014 to US$22.73 billion by 2019, at
a compound annual growth rate of 9.3%. With this
growth comes an increased energy demand on grid
infrastructure. Power distribution, cooling, and energy
costs comprise 31% of a typical data center's monthly
operating expenditures. This percentage is based on
an electric rate of US$0.07/kWh, which is currently
attainable in the United States through careful site
location within certain regions; however, this is unrealistic in highly populated areas such as New England
(US$0.16/kWh) and California (US$0.14/kWh). Many
other regions offering low electric rates do not have
sufficient networking infrastructure to support current
data center communications requirements. The risk of
electric rate increases or data bandwidth limits during
the 10-15-year life of a typical data center investment
is concerning.
Reliability, efficiency, and cost benefits result
from applying dc power system architecture versus
ac or hybrid power systems architecture throughout
data center design. Reliability is improved by eliminating the need for ac power supply to the data

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Table of Contents for the Digital Edition of IEEE Electrification Magazine - June 2016

IEEE Electrification Magazine - June 2016 - Cover1
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IEEE Electrification Magazine - June 2016 - 1
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https://www.nxtbook.com/nxtbooks/pes/electrification_december2022
https://www.nxtbook.com/nxtbooks/pes/electrification_september2022
https://www.nxtbook.com/nxtbooks/pes/electrification_june2022
https://www.nxtbook.com/nxtbooks/pes/electrification_march2022
https://www.nxtbook.com/nxtbooks/pes/electrification_december2021
https://www.nxtbook.com/nxtbooks/pes/electrification_september2021
https://www.nxtbook.com/nxtbooks/pes/electrification_june2021
https://www.nxtbook.com/nxtbooks/pes/electrification_march2021
https://www.nxtbook.com/nxtbooks/pes/electrification_december2020
https://www.nxtbook.com/nxtbooks/pes/electrification_september2020
https://www.nxtbook.com/nxtbooks/pes/electrification_june2020
https://www.nxtbook.com/nxtbooks/pes/electrification_march2020
https://www.nxtbook.com/nxtbooks/pes/electrification_december2019
https://www.nxtbook.com/nxtbooks/pes/electrification_september2019
https://www.nxtbook.com/nxtbooks/pes/electrification_june2019
https://www.nxtbook.com/nxtbooks/pes/electrification_march2019
https://www.nxtbook.com/nxtbooks/pes/electrification_december2018
https://www.nxtbook.com/nxtbooks/pes/electrification_september2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2018
https://www.nxtbook.com/nxtbooks/pes/electrification_december2017
https://www.nxtbook.com/nxtbooks/pes/electrification_september2017
https://www.nxtbook.com/nxtbooks/pes/electrification_march2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2017
https://www.nxtbook.com/nxtbooks/pes/electrification_march2017
https://www.nxtbook.com/nxtbooks/pes/electrification_june2016
https://www.nxtbook.com/nxtbooks/pes/electrification_december2016
https://www.nxtbook.com/nxtbooks/pes/electrification_september2016
https://www.nxtbook.com/nxtbooks/pes/electrification_december2015
https://www.nxtbook.com/nxtbooks/pes/electrification_march2016
https://www.nxtbook.com/nxtbooks/pes/electrification_march2015
https://www.nxtbook.com/nxtbooks/pes/electrification_june2015
https://www.nxtbook.com/nxtbooks/pes/electrification_september2015
https://www.nxtbook.com/nxtbooks/pes/electrification_march2014
https://www.nxtbook.com/nxtbooks/pes/electrification_june2014
https://www.nxtbook.com/nxtbooks/pes/electrification_september2014
https://www.nxtbook.com/nxtbooks/pes/electrification_december2014
https://www.nxtbook.com/nxtbooks/pes/electrification_december2013
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