RESIDENTIAL BATTERY STORAGE

Iowa Energy Summit 2019: November 7th, 2019

Kent Whitcomb – Director of Member Services

Minnesota. Iowa. MiEnergy Cooperative

Residential BatteryPilot Project

Co-op Vision For Residential Battery Storage Research Project

• Charge “off peak” from grid – Discharge

“on peak” to household loads

• Incentive rate for participating

members

• Develop control mechanisms for

multiple control strategies

• Solar storage/avoided cost reduction

• Peak shaving for demand customers

Financial Hurdles

ECO 4 ECO 6 ECO 8

$8,457.50 $10,174.16 $11,890.82

4 kWh 6 kWh 8 kWh

ECO 10 ECO 12 ECO 14 ECO 16

$14,522.25 $16,238.91 $17,955.57 $19,672.23

10 kWh 12 kWh 14 kWh 16 kWh

4 kW Inverter

8 kW Inverter

MiEnergy Pilot Project

• Co-op paid for installation and equipment

• MiEnergy covering insurance

• Duration of project – 5-10 years (possible ext.)

• Screening Process

• 2 Units in MN

• 4 Units in IA

• Battery Constraints

How the system works

Performance During Outage

11/7/2019

Solar Arrays Combined With Battery Unit

Store or Sell?

Safety Is Responsibility

Placards

Lithium Iron Phosphate

E-Stop

200 Amp Breaker

Local Fire & Rescue Notified

Does The Battery Really Cover The Entire Home?

17.00%

17.32%

19.03%

19.17%

18.13%

15.50% 16.00% 16.50% 17.00% 17.50% 18.00% 18.50% 19.00% 19.50%

% of Home Covered by Battery

AC/DC/AC Performance

Totals

Site 1

Site 4

Site 2

Site 3

What Next?

• Discuss with Dairyland on control strategies for load MGMT

• Setup/test APi system to remotely control each unit

• Sonnen designing a fixed discharge rate with TOU for next system update

• Implement energy storage rate – TOU rate

• Embrace the future

Thank You!

11/7/2019Rural Electric Cooperatives 101

Overview: Energy storage research at ISUIAEE Summit November 7, 2019

Anne Kimber, Ph.D, P.E., Director EPRC

• EPRC: Catalyst for collaboration in ISU-industry power systems R&D and technology transfer, tostrengthen undergraduate and graduate education in energy infrastructure

• We study power systems from large interconnected transmission grids to microgrid-scale

• Research and education driven to improve reliability and security of the grid as more variable anddistributed generation resources are connected, and as loads also become more variable.

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EPRC started in 1963 as Power Affiliates Program“Advance research and graduate education in electric power systems and strengthen industry ties”

Industry Members: • Alliant Energy• City of Ames• City of Bloomfield• Cedar Falls Utilities• Central Iowa Power Cooperative• Corn Belt Power Cooperative• International Transmission Company Midwest• MidAmerican Energy• MidContinent Independent System Operator

Other Collaborators: Algona Municipal Utilities, Maquoketa Valley Electric Cooperative, Iowa Army National Guard

Power Systems Engineering Faculty: Experts in their profession• Venkataramana Ajjarapu, Nichols Professor, IEEE Fellow, vajjarap@iastate.edu; Voltage stability, T&D co-modeling• Ian Dobson, Sandbulte Professor, IEEE Fellow, Dobson@iastate.edu; voltage collapse, cascading outage • Manimaran Govindarasu, Mehl Professor, IEEE Fellow, gmani@iastate.edu; cyber security of power systems• Jim McCalley- London Professor, IEEE Fellow, jdm@iastate.edu; SEAMS project, co-optimization, • Hugo Villegas-Pico, Assistant Professor, Power Systems, Power Electronics and Controls, hvillega@iastate.edu• Zhaoyu Wang, Harpole-Pentair Assistant Professor, wzy@iastate.edu; Distribution Systems, renewable energy

integration18

ISU Energy Storage initiatives• Iowa Economic Development Authority and Ideal Energy: analysis of data from

solar array plus Tesla Li-ion, and solar array plus vanadium flow battery

• Battery health prognostics and performance monitoring- Mech. Eng.

• Flow battery development- Chemical Eng.

• Sodium battery- Materials Science and Engineering- Iowa Energy Center

• Mobile microgrid with storage- EPRC funded by IEDA ARRA

• Energy storage in renewable fuels- Bioeconomy Institute

• “Tools” for integration of storage• Co-simulation of distribution and transmission with variable resources-EPRC• Large-scale system modeling- the SEAMS project- DOE NREL• Resilient infrastructure planning- the Puerto Rico project- NSF• Machine learning for customer load analysis- Algona Municipal Utilities- APPA• New DOE project on distributed wind integration with storage- Algona and others• Deployment of micro phasor measurement units on distribution systems- Iowa Energy Center• Development of the next generation of inverters to create a power system with very limited

physical inertia – our newest professor Hugo Villegas-Pico

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Robert BrownBioeconomy Institute

Chao Hu, Mechanical Engineering

Wenzhen Li, Chemical and Biological Engineering

Song-Charng KongMechanical Engineering

Steve Martin Materials Science and

Engineering

▪ Flow battery with hybrid acid and base electrolytes showed high operation voltage

and reasonable durability.

▪ Open circuit voltage of the quinone flow battery was increased by 300 mV.

▪ Hybrid electrolyte concept has been applied to quinone-iron flow battery in my

lab, and it is promising for many other redox mediators.

Higher Voltage Organic Redox Flow Batteries with Hybrid Acid

and Base Electrolytes

Dr. Wenzhen Li* and Mohsen Torabi, Chemical & Biological Engineering Department,

Iowa State University

IEDA ARRA funding: mobile microgrid for disaster recovery

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Collaborators:Iowa Army National GuardSunCratePowerFilm Inc.ISU Mechanical Engineering ISU Electrical EngineeringISU Architecture

Design and construct a “plug and play” mobile microgrid with solar PV, battery capacity, diesel generator, and controls

Design second crate for operations (ref: solar decathlon)

Solar crate in Puerto Rico, August 2018

MISO Real Time Prices October 9, 5:20 pm

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MISO Real Time Prices August 16, 2017, 5:25 pm

24https://api.misoenergy.org/MISORTWD/lmpcontourmap.html

Interconnection Seam Study

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• Funded by NREL/DOE, started in 1/2017, original studies/design completed 12/2018 but still performing sensitivity studies for it.

• Very high-profile project; lots of interviews & requests to present.• Designing cross-seam high capacity HVDC transmission to facilitate

movement of Wind East-to-West and Solar West-to-East. Participants:National Labs: NREL, PNNL, ORNLIndustry: MISO, SPP, WAPA, WECCUniversities: ISU Tech advisory board-25 companies

Participants:National Labs: NREL, PNNL, ORNLIndustry: MISO, SPP, WAPA, WECCUniversities: ISU Tech advisory board-25 companies