Energy storage - two Canadian Case Studies ESA Annual Conference, Washington, June 4th. Alex Bettencourt Managing Director

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1 Energy storage - two Canadian Case Studies ESA Annual Conference, Washington, June 4th Alex Bettencourt Managing Director

2 National Association Made Up of Entire Industry Utilities Industry Academia / R&D

3 Two Canadian Case Studies Power Outages BC Hydro s Field Project Renewable Integration Hydro One s Flywheel Project

4 BC Hydro Overview General Crown Corporation Serving about 95% of province and 1.9 million customers ~10,500 MW demand Generation 13,800 MW capacity 41 Dam sites, 30 Hydro facilities and 9 Thermal units > 90% renewable Wind under contract 790MW, installed 480MW Transmission 500kV series-compensated backbone 18,000 km of transmission lines, 22,000 steel towers 260 substations One primary control center + one backup Interconnected to Alberta and US part of WECC Distribution 56,000 km of Distribution lines Approx. 900K poles, over 300K of transformers Serve 17 Non-integrated areas 4

5 Battery Energy Storage Project Opportunity Issue Golden substation near-capacity Served via single 69kV transmission line Peak load ~28MVA 2 x 25kV transformers Poor reliability indices for Field Single 55km 25kV distribution from Golden Peak load ~550kVA Proposal Add 2MW battery energy storage to Golden distribution network to reduce peak load on substation Defer transformer upgrades at substation for 2 years Locate 1MW of the battery energy storage at Field to supply power during feeder outages 5

6 Schedule Delays Procurement (May 2010 Mar 2011) Two separate requests for proposal: Energy storage technology Systems integration Permitting (Mar 2010 Aug 2011) Funding from the Federal Government triggered CEAA (Canadian Environmental Assessment Application) process Parks Canada additional permitting requirements Fire Incident in Japan (Oct 2011 Aug 2012) Construction stopped NGK investigation and design changes BC Hydro risk assessment and business case review Reduce scope to 1MW in Field only 6

7 Design Challenges Civil Design Operating temperatures -50 C to + 40 C Maximum snow depth 1.2m Use metal building to provide snow protection and fans to cool in summer Telecom Design Backhaul from Field to BC Hydro operations (satellite) Field area network between battery site and intellirupter (900MHz radio) Under cover installation, Field, BC, BC Hydro

8 Battery Energy Storage Performance Peak Shaving Daily from 4pm-8pm at set power level Islanding 9 outages 1 failed to activate Total of 77 hours of outage prevented 8

9 Battery Energy Storage Performance Islanding Date Duration Reason July 15, hours Tree July 19, hours Tree Sep 21, hours Vehicle accident Sep 27, hours Vehicle accident Oct 5, hours Vehicle accident Oct 11, hours Unknown Nov 15, 2013 Failed to activate Coordination between intellirupter and vista Nov 19, hours Tree, snow, wind March 8, hours Highway closure/avalanche 9

10 Project Case Study Partner: Temporal Power Challenge/Requirement 20MW of wind power connected to 40 km feeder line in Southwestern Ontario, Canada. It is causing significant voltage swings and power quality problems due to intermittent ramping of wind turbines. Temporal Power Solution 5MW flywheel facility will provide power quality and voltage support Project Launch Date Project to be commissioned Q2 2014

11 Temporal Power Flywheel A FLYWHEEL system stores electrical energy and can be thought of as a Kinetic Battery. Flywheels work by accelerating a rotating mass to a high speed and using the momentum to generate electricity when needed. Using fully recyclable components, Temporal Power flywheels are clean technology solving some of the most challenging issues on power grids around the world.

12 Flywheel Project 5 MW Flywheel Model (2.5 MW shown) 5MW System Specifications Energy Capacity Power Output 500 kwh 5 MW FESS Efficiency > 90% Response Time Input Voltage < 10 ms 480 VAC Temperature Range -40 to 40 C Cycle Life > 250,000 Discharge Depth 100% 12

13 The Problem & Solution Actual Voltage Waveform at Wind Farm Connection Location: Tillsonburg TS M2 feeder Large wind farms on the feeder are causing power quality issues Customer s are impacted by fluctuating voltage and system losses are increased as a result Sub-station tap changers are unable to regulate the voltage fast enough and classic compensation methods can t address the full issue Corrected Voltage Waveform (Calculated) 13

14 Additional High Power Flywheel Applications Energy storage is often the only or most cost effective way to balance energy on power grids over short periods of time. Whether balancing momentary grid-wide differences between supply and demand, stabilizing frequency and voltage on isolated grids, or providing ramping control to better integrate renewable power, these highly demanding grid functions are best met with high performance energy storage solutions. Temporal Power specializes in highly demanding applications where typical duration times of 3 to 15 minutes of fast acting energy storage operate for thousands of cycles annually, to continuously keep power grids in balance.

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