Knoxville Battery Energy Storage — renewablesinfo.org

Knoxville Battery Energy Storage — Plant Summary

EIA Plant ID: 62569
Capacity: 1.1 MW
Primary Fuel: Battery Storage
Technology: Batteries
Status: Operating
Location: Marion, IA
Operating Since: 2018
Generators: 1
Operator: MidAmerican Energy Co
Parent Company: Berkshire Hathaway
Annual Generation: -25 MWh
Capacity Factor: -0.3%
Balancing Authority: Midcontinent Independent Transmission System Operator, Inc..
ISO/RTO: MISO
NERC Region: MRO

Search ExploreKnoxville Battery Energy Storage

Knoxville Battery Energy Storage

OperatingBESS

Ranked #4 of 4 BESS plants in IA#819 of 837 nationally

1.1 MW BESS operating in Marion, IA — Midcontinent Independent Transmission System Operator, Inc..

EIAWD

1.1 MW

Nameplate Capacity

Generators

unit

Batteries

Technology

2018

Operating Since

Location

Coordinates

34.0410, -85.2232

County

Marion, IA

Nearby Plants

Polk County GA S1, LLC
Solar3 MW · 0.9 km
Polk Cedartown 2
Solar2.4 MW · 1.3 km
Polk Cedartown
Solar2.2 MW · 5.6 km

Ownership & Operator

Field	EIA	GEM	Wikidata
Operator	MidAmerican Energy Co	MidAmerican Energy	—
Owner(s)	MidAmerican Energy Co	Berkshire Hathaway	—
Status	Operating	—	—

Ownership Chain

About

The Knoxville Battery Energy Storage system is a 1.1 MW battery energy storage system located in Marion County, Iowa. The plant began operating in 2018 and is owned by Berkshire Hathaway and operated by MidAmerican Energy Co. It is the fourth-largest battery storage facility in Iowa, and ranks 1186th nationally.

The facility consists of a single generator utilizing battery technology, with a total storage capacity of 4 MWh. The battery chemistry is lithium-ion (LIB), and the duration is 3.64 hours. The plant operates within the Midcontinent Independent Transmission System Operator (MISO) market and balancing authority, within the Midwest Reliability Organization (MRO) NERC region.

Generated from EIA, GEM, and public data sources

EIA Plant Profile Wikidata

Engineering & Generators

Grid Context

NERC Region

MRO

Balancing Authority

Midcontinent Independent Transmission System Operator, Inc..

Grid Voltage

13.2 kV

Regulatory Status

Entity Type

Investor-Owned Utility

Sector

Electric Utility

Generation

−2 MWh

Net Charging

-25 MWh

Annual Net Energy

-0.3%

Capacity Factor

Jan 2022 – Dec 2024

Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.

Financial Data

No financial data available for this plant.

Pricing & Market Data

MEDIUM confidence

Market Position

ISO/RTO Market

MISO

LMP Node

—

Pricing Hub

MINN.HUB

Node Source

Shared substation inference

MEC.KNOXIN 1Nearby ISO Node

News & Articles (8)Beta

General

Surge Announces Former Berkshire Hathaway Energy Executive Mr. Richard Weech Joins the Board as an Independent Director

West Vancouver, British Columbia--(Newsfile Corp. - March 17, 2026) - Surge Battery Metals Inc. TSXV:NILI (OTCQX: NILIF) (FSE: DJ5) (the...

TradingView·1 weeks ago

General

Powin Selected by BHE Renewables, a Berkshire Hathaway Energy business, for one of the World’s Largest Solar and Storage Microgrids

Powin, a global leader in energy storage solutions, will partner with BHE Renewables as the energy storage solutions provider for one of the...

Business Wire·1 years ago

General

Berkshire Hathaway IPP secures energy storage offtake agreements with California community electricity provider

BHE Renewables (BHER) has secured Power Purchase Agreements (PPAs) with California community electricity provider Clean Power Alliance (CPA).

Energy-Storage.News·1 years ago

General

Berkshire Hathaway IPP secures energy storage offtake agreements with California community electricity provider

BHE Renewables (BHER) has secured Power Purchase Agreements (PPAs) with California community electricity provider Clean Power Alliance (CPA).

Energy-Storage.News·1 years ago

Last updated 2026-03-26

View all 8 articles

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EIA Wikidata

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