Direct Current (DC) Data Center Reino Buchmüller, Head of Low Voltage Systems, Helsinki, August 31, 2011 Direct Current (DC) Data Center The game changer

Data center power supply DC versus AC – the concept “Grid-to-Chip” Utility UPS PDU AC-Server 13.8 kV AC AC/DC e.g. 750 V DC Transformer 480 V AC 208/120 V AC DC/DC VR CPU Batteries MV rectifier package 380-400 V DC DC-Server © ABB 2010 Chart 2

Why DC Data Center? Better energy efficiency, cost savings Higher energy efficiency by up to 25% Increase in transmission and conversion efficiencies / fewer conversions, less heat generation 10% energy savings on electrical distribution system1, plus 15% in IT room2 Reduced floor space up to 30% Less power & cooling equipment 2,700 sq ft saved on a fully redundant (1MW) solution, representing ~20% Reduced installation and maintenance cost of up to 30% Less equipment, simplified wiring 30% less installation cost than AC fewer components = less maintenance needs4 Increased reliability and availability Less conversion stages less equipment Uninterruptable Power Supply UPS -related issues most often cited for data centre failures3 1 ABB analysis 2 Duke Energy analysis 3 Emerson Network Power 4 Syracuse University © ABB 2010 Chart 3

Direct current DC renewable energy options Simple, reliable, fast and modular integration Energy Integration Easily integrate renewables (photovoltaic, fuel cells, wind), storage (batteries) and DC consumers = DC micro grid No synchronization required to connect multiple sources © ABB 2010 Chart 4

Direct Current DC data center showcase green Direct Current DC data center showcase green.ch data center Switzerland Green.ch’s most modern data center in north-central Switzerland Tier level III standard UPtime 10‘000 m2 / 30 megawatt facility divided into three modules Offering secure storage and data management capabilities ABB is installing a fully redundant 1 megawatt DC power solution inside the first, operational module A, operational Q1 2012 Designed and engineered to green.ch’s stringent ecological standards by Validus DC Systems, an ABB company green.ch DC data center is ABB’s demonstration site for its new DC technology A showcase for international data center customers seeking to profit from this groundbreaking DC technology © ABB 2010 Chart 5

Direct current data center showcase green.ch data center Switzerland

The future of data centers DC Technology will make strong progress, AC technology to be used where appropriate AC is technology of choice whenever heat can be re-used or in cold locations like Northern Europe For most locations, DC data center technology is more energy efficient and cost saving DC will be a „game changer“ for data centers to reach better energy efficiency levels © ABB 2010 Chart 6