Energy storage - two Canadian Case StudiesESA Annual Conference, Washington, June 4th

Alex BettencourtManaging Director

Academia / R&D

Utilities

Industry

National Association Made Up of Entire Industry

Two Canadian Case Studies

Power Outages

BC Hydro’s Field Project

Renewable Integration

Hydro One’s Flywheel Project

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

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

Battery Energy Storage Project Opportunity

Schedule Delays

6

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

Design Challenges

7

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 2013

Battery Energy Storage Performance

8

Peak Shaving

Daily from 4pm-8pm at set power level

Islanding

9 outages

1 failed to activate

Total of 77 hours of outage prevented

Battery Energy Storage Performance

9

Date Duration Reason

July 15, 2013 7.5 hours Tree

July 19, 2013 9 hours Tree

Sep 21, 2013 9.5 hours Vehicle accident

Sep 27, 2013 8 hours Vehicle accident

Oct 5, 2013 2 hours Vehicle accident

Oct 11, 2013 3 hours Unknown

Nov 15, 2013 Failed to activate Coordination between intellirupter and vista

Nov 19, 2013 14.5 hours Tree, snow, wind

March 8, 2014 23.5 hours Highway closure/avalanche

Islanding

Project Case StudyPartner: 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 Solution5MW flywheel facility will provide power quality and voltage support

Project Launch DateProject to be commissioned Q2 2014

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.

Flywheel Project

12

5 MW Flywheel Model

(2.5 MW shown)

5MW System Specifications

Energy Capacity 500 kWh

Power Output 5 MW

FESS Efficiency > 90%

Response Time < 10 ms

Input Voltage 480 VAC

Temperature Range -40 to 40 °C

Cycle Life > 250,000

Discharge Depth 100%

13

The Problem & Solution

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

Actual Voltage Waveform at Wind Farm Connection

Corrected Voltage Waveform (Calculated)

0.97

0.98

0.99

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1.01

1.02

1.03

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1.05

1.06

1.07

0.97

0.98

0.99

1

1.01

1.02

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1.07

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.