LCO

S ($

/KW

H)

$0.00

$0.05

$0.10

$0.15

$0.20

$0.25LCOS calculated for renewable integration: • 600 MWh energy storage facility • 4 hours of usable storage, 1 cycle per day • 25 years of operation

Increased Cycles and LongerDuration Increase Value: • 2 Cycles/day@ 4 hrs • 2 Cycles/day@ 5 hrs

$0.12

$0.10 $0.10$0.09

$0.05$0.037

$0.03

LTO NMC LFP VRB ESS

Lithium-ionChemistries

AFRICA’S RENEWABLE ENERGY INFRASTRUCTURE POTENTIALAt ESS Inc., we understand that project developers, utilities, and governments are re-examining

the role of energy storage throughout Africa. As the need for more flexible heat tolerant energy

storage increases, ESS Inc. provides superior cycle life, increased safety, and environmentally

sustainable solutions. As Power Africa’s only flow battery partner, we are committed to deploying

our long-duration energy storage solutions for microgrid and utility-scale projects throughout the

continent to help Power Africa achieve its goals of bringing 30,000 MW of new and cleaner power

generation online, and delivering 60 million new electricity connections.

We are the only energy storage platform that offers a comprehensive 10-year insurance policy that

cover’s our product’s performance. Backed by Munich Re, the world’s leader in the development

of new insurance solutions for climate-friendly technologies, this policy provides our customers

with a long-term performance guarantee.

COMPETITIVE COMPARISONLevelized Cost Analysis – 2020 CapEx Cost

BANKABLE LONG-DURATION ENERGY STORAGE FOR AFRICA

LOWEST LEVELIZED COST OF STORAGE

FEATURES AND BENEFITS• Operating range: Up to 125°F ambient with no AC required

• No toxic materials, pH similar to soda, no fire or explosion risk

• Easy to maintain, easy to source parts and materials.

Easy to permit - built in safety measures, tertiary containment,

and certified safety requirements. (e.g. UL, CE)

• 10-year warranty, battery performance and business

continuity coverage provided by Munich Re, a world

leader in the development of new insurance solutions

for climate-friendly technologies

PERFORMAN

CEEC

ON

OMICS

DURABILIT

Y

SAFETY

IndustryLeadingLCOS

LowAcquisition

Cost

No ACRequired

Wide OperatingTemperature

Range

PassiveElectrolyte

BankableWarranty

Low O&MCosts

No CyclingLimits

No CapacityFade

No Performance

Loss

InherentlySafe

Non-Flammable

Non-toxicChemistry

Long-duration storage improves project economics, serving

multiple energy and power use cases over a project’s life span.

POWERING AFRICA’S CLEAN ENERGY FUTUREIF your project requires clean, safe, and sustainable energy storage ...

IF you can envision four or more hours of stored energy ...

IF you want to make your grid more flexible and resilient …

The ESS Inc. Energy Warehouse™ and Energy Center™ are the solution.

Bankable long-duration energy storage for Africa

100KW/400KWH ENERGY WAREHOUSE™

Principles of iron fl ow battery chemistryOur battery is powered by simple electrochemistry, comprised of earth-abundant iron, salt, and water. The system’s

environmentally benign characteristics, containing no hazardous chemicals or rare-earth metals, make it the

easiest-to-permit storage technology in the world. The iron fl ow battery has no fi re, chemical, or explosive risk,

eliminating the need for fi re-suppression, secondary containment, and hazmat requirements. Systems can be easily

refurbished to extend life additional 20+ years or fully recycled at end of life.

ME

MB

RA

NE

Negative Side – Plating Side

FeCL2

Positive Side – Redox Side

Ions

CHARGE

Fe0 Fe2+

CHARGE

DISCHARGE

DISCHARGE

FeCL2

FeCL3

Fe3+ Fe2+

Low-cost abundant electrolyte material

With the same electrolyte running on both the negative and positive sides of the

membrane, there is no cross contamination.

6 REASONS TO CONSIDER THE ENERGY WAREHOUSE™ AND ENERGY CENTER™1. Unlimited cycling: Our batteries can be operated under any duty cycle requirements without

limitation and no degradation in performance.

2. Bring the heat: Our batteries operate from 5° to 50°C without the need for A/C.

3. Lowest cost of service: Our batteries have the lowest overall cost of service for long-duration

or multi-cycling requirements, especially so in “workhorse”, heavy use applications.

4. Long-life asset: Our energy storage system has a design life of 25 years.

5. No hazardous materials, no fire risk or explosion risk: Our batteries use no hazardous materials,

which means no hazmat training, no hazmat suits, no hazardous chemicals disposal plan, and

easy permitting.

6. Warranty backed by Munich Re: Our power module warranty is the only one in the world backed

by an investment-grade insurer. Expect nothing less for your energy storage investment.

Hazard-free energy storage

Our electrolyte and module were tested to nearly 14,000 cycles with no loss of performance.

Subsequent analysis confirmed no corrosion, no loss of material, no mechanical deformation

issues. Tests conducted under the Advanced Research Projects Agency-Energy program.

No cycling limits – no degradation40+ years simulated operation of electrolyte and power module

ESS IFB Cycle Performance

50%0 2,000 4,000

ESS Data Li-Ion Cells

6,000

10,000 cycles shallow cycling (to 75% SOC) Deep cycling (to 25% SOC)

8,000 10,000 12,000 14,000 15,000

60%

70%

CA

PAC

ITY

(%)

CYCLES

80%

90%

100%100%

110%

EXPORT–IMPORT CREDIT FINANCE INSTRUMENTSEx-Im Bank financing is available for up to 85% of the

project cost for qualifying customers to purchase our

energy storage platforms. Coupled with our industry-first

performance and business continuity coverage backed by

Munich Re, our products are now among the world’s most

bankable energy storage platforms.

POWER AFRICA PARTNERSHIP

“This partnership will accelerate

our corporate commitment to

develop over 70 MW and 200 MWh

of energy storage in Africa,” said

Craig Evans, founder and CEO of

ESS Inc. “With our safe, proven

and earth-abundant all-iron flow

battery technology, ESS Inc. stands

ready to work with Power Africa and

its network of project developers,

utilities, and EPCs to make the

transition to increased accessibility

and sustainability of electricity

supply in Africa.”

FEATURE DATA

Performance

Roundtrip Effi ciency: 75% (DC-DC), 70% (AC-AC)

Voltage: 600-850VDC up to 1,000VDC Open circuit voltage (OCV) 400-480VAC, 3-phase, 50/60Hz

Response time: Full power in <1 sec.

Module Cycle Life: >20,000 cycles

Communications: Data/control Modbus interface; TCP/Ethernet interface for monitoring

Environmental

Battery Recyclable components

Electrolyte FeCl2, KCl, H2O; non-fl ammable, non-corrosive

Ambient Temperature -5°C to +50°C

Warranty 1 year comprehensive defect warranty 10 year warranty backstop underwritten by Munich Re available

Certifi cation NRTL fi eld label per UL9540, IP54, CE mark (EU version only)

Qualifi ed Projects deployed during the Policy Period of Feb. 1, 2019 – Jan. 31, 2020 can obtain additional

warranty back-stop by Munich Re, with insurance capacity exclusively allocated at project level.

Warranty partner

OUR BATTERY STORAGE IS NOW BANKABLE – WE’RE PAVING THE WAY FOR RENEWABLE ENERGY THROUGH-OUT AFRICA.Most recently, we concluded an agreement with Munich Re who now provides insurance that

backstops our products as well as our company. This is a major breakthrough that makes ESS the

only long-duration energy storage system provider globally that offers a “bankable” long duration

energy storage system.

ENERGY WAREOUSE™ 100kW/400kWh

Illustrative, sample system layout. Can be scaled to

different confi gurations. Depicted here is the 250kW 8-hour

layout. Approximate dimensions: 6.5m W x 13m L x 4m H

ESS, Inc.26440 SW Parkway Ave. Wilsonville, OR. 97070Tel: (855) 423-9920Email: info@essinc.comwww.essinc.com

Copyright © 2019 ESS, Inc. All rights reserved. Specifi cations may change without notice. ESSInc_Africa_4pager_070819

For more information, contact:

ENERGY CENTER™: ENERGY STORAGE SOLUTIONS DESIGNED AND SIZED TO YOUR PROJECT’S ENERGY REQUIREMENTS

ABOUT ESS INC. Established in 2011, ESS Inc. develops and manufactures

the low-cost, long-duration Energy Warehouse (EW) fl ow

battery for commercial and utility-scale energy storage

applications requiring 4+ hours of fl exible energy capacity

and 20+ years of operating life with no capacity fade. The

EW utilizes earth-abundant iron, salt, and water for the

electrolyte, and delivers an environmentally safe, long-life

energy storage solution for the world’s renewable energy

infrastructure with the lowest levelized cost of storage per

kWh. For more information, visit www.essinc.com.

Bankable long-duration energy storage for Africa