IPL Harding Street BESS
Project J401
Interconnection Process Task
Force
March 26, 2015
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174 MWs and growing
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Tait Energy Storage
Resource
• Interconnection filed
November 2012
• Project approval
March 2013
• Commercial
Operations
September 2013
• 40MW flexible
range
• More than 160,000
MWs regulation
served as of
September 2014
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64 MW Storage Resource
- PJM
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Over 30 GW or simple cycle gas turbines
expected in next 10 years in US alone,
3X globally
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Storage a better option than new peakers
High utilization for system security, peaking, and renewable support
MISO Interconnection Queue
Project J401
• New IPL project
• The 20 MW (40MW
Flexible Range) battery
installation to be in service
Spring 2016
• Can expand up to
200MWs in the future if
warranted
• This site can access most
of IPL’s units at this site for
potential black start
• Will be connected to the
138 kV
• IPL is an Indiana utility
which is owned by AES
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HSS 20 MW (Flexible 40 MW) Battery Storage Project
A 1 hour battery design
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Energy storage equipment is in rows of racks, similar to
computer equipment in a data center
Cells
Modules
Trays
Moveable & Scalable Racks
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Permitting profile is similar to a warehouse or data
center, not a traditional electricity generation project
Site Permitting Profile
Energy Storage
Warehouse
Power Plant
Air
Water
Fuel
Building
Permit
Stormwater
No air emissions
No process
water
No fuel
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
Required
Required
Required
Required
Required
Project Attributes
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Economic development
Technology leadership
Environmental friendly
solution
Enables renewables
Modernization of
infrastructure
More efficient use of
existing power plants
Exciting
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Energy storage warehouse design and permitting
profile similar to a datacenter
 Building construction
 One story building, concrete and steel construction
 Firewalls between equipment rooms and for outside walls
 Occupancy class per International Building Code
 Fire Suppression system
 Equipment:
 Power conditioning systems (inverters)
 Sealed cell batteries, data center racks
 425 tons of cooling
 Switchgear and transformers
 Tie-line to existing 13.8kV GSU transformer, shared with
combustion turbines
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10 MW Warrior Run BESS is a 5,000 square foot
building, and has a 138kV transmission connection,
COD 2015
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CUSTOMER/GRID BENEFIT – FREQUENCY
REGULATION
• Frequency Regulation insures that
supply and load of MWh match on realtime basis
• The first picture shows the traditional
way to provide frequency regulation
• A generator is sent an AGC signal
(green dotted line) to match load
(red line)
• Close, but not perfect match
• Not ideal
• Energy Storage is a superior way to
provide for frequency regulation since it
can instantaneously add or remove
energy from the grid
• As noted on the second picture
where the green and red lines are
in sync
• Pictures provided by PJM
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Continuously on
Continuously charge
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Can Provide Energy at the Peak
Example is a 4 hour battery
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CUSTOMER/GRID BENEFIT – 5MW CAPACITY
VALUE
• 20MW BESS can provide 20MW
for 1 hour or 5MW for 4 Hours
• IPL is working within the MISO
process to receive 5MW of
capacity value for the project for
2016/17 PY
• Batteries as a source of capacity
will be an increasingly important
resource to meet peaking
capacity in the US
• Over 30 GW or simple cycle gas
turbines expected in next 10
years in US alone, 3X globallly
• AES has aggressive goals to
build BESS to met this capacity
need
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