1. Panel on DC Power for Buildings
Keiichi Hirose, Ph.D.
NTT Facilities, INC. Japan
IEEE EnergyTech Conference
The Case Western Reserve University,
Cleveland, Ohio
May 31, 2012

2. History of 380VDC power promotion for data centers2
History of 380VDC power promotion for data centers
Step1
Research & development
Step2
Field demonstration
Step3
Commercial services
NEDO Sendai Microgrid Demo
2007 Dec.
DC Microgrid Demo With 380 VDC servers
2009
100 kW, 380 VDC
Demos in Tokyo
2011 Feb.
Commercial Service
With 380 VDC
2006 June
JANOG Panel
discussion
2008 June
NTT News release
“Use of DC power for
Data centers in NTT” ・
Note :
JANOG: Japan Network Operators Group

3. DC Power Demonstrations by NTT Facilities3
Module data center in wind farm
NTT EAST *
NTT Facilities
NTT Data Corp.
Sapporo
Sendai
NEDO Project
300VDC Demo
NTT Musashino　lab.
Fukuoka
NTT Atsugi lab.
Osaka *
: The demonstration was supported by Ministry of Internal Affairs and Communications, Japan in 2010.
Aichi
380VDC Microgird
In university campus
Tokyo Metropolitan 100 KW x 5 sites 3

4. Next step for advanced DC power system
Telecommunications
Central offices
Fusion, since 2000
Computer
(Information) DC
power
Data centers
Next step
Electric appliances
Distributed Energy Sources
Residential, commercial buildings

5. New Project FY
Smart community project by DC power distribution for commercial and residential buildings
Obihiro city,
Hokkaido
Yamagata city
Tokyo
This project is supported by the Ministry of Environment, Japan.

6. Purpose of the project
Distributed autonomous system with DC power integration
Development of
High-efficient energy system
Energy interchange system
Disaster prevention function(s)
Business model
Demonstraion in 2 sites (Yamagata, Obihiro)
Feasebility study

7. Demonstration area in Yamagata city (Draft)
Office building zone
Energy center
PV panels
Commercial building zone
Commercial building zone
Power node
Demonstration area in Yamagata city
(Draft)
Residential zone
(4 houses)