Battery Energy Storage System (BESS) Tracker – Halcyon

Intro to Halcyon’s BESS Tracker

Halcyon's BESS Tracker compiles information on newly proposed, in development, and under construction battery energy storage systems across the United States. The dataset consolidates key project details into a structured, research-ready dataset, drawing from state public utility commission (PUC/PSC), regional grid operator (ISO/RTO), and Federal Energy Regulatory Commission dockets, as well as U.S. Energy Information Administration (EIA) datasets.

Each project entry captures essential attributes such as docket numbers, project names, capacity, size, duration, technology type, development milestones, planned operating year, point-of-interconnection, and developers. Where available, the dataset includes granular details such as parent company, contracted capacity, relationship to data centers, battery manufacturer, cost figures, behind-the-meter, co-location specifics, and inverter make and model.

Human-in-the-loop

Halcyon's analysts use AI-assisted search to identify relevant filings, and each data point is validated by subject-matter experts. The result is a uniquely reliable resource for understanding the scale, timing, and characteristics of upcoming battery storage across the U.S. electricity landscape.

Halcyon updates the Grid to incorporate new projects weekly and updates already tracked projects on a monthly basis as information becomes available.

More information you would like to know across all projects?

Subscribers can add new columns to tease out details for their bespoke purpose. Choose from one or two words, a short phrase, a few sentences, dates, years, whole number, decimal number, or true/false to fetch the information in the format of your choosing.

The more verbose your question, the better. As our head of engineering likes to remind us, robots do best when instructed explicitly, “do what I say, not what I mean.”

Methodology

Field	Column Type	Description
Project Name	Text	Name of the battery energy storage system project
State	Text	State where the project is located
County	Text	County/Parish where the project is located
BA Code	Text	Relevant balancing authority
Utility	Text	The utility providing transmission and distribution for the BESS
Docket Number	Text	Proceeding numbers for the applicable state Commission, ISO/RTO, or FERC Typically an interconnection agreement, exempt wholesale generator, certificate of public convenience, or power company registration proceeding Citations include a link to Halcyon AI generated Docket Profile Page.
Technology	Text	Battery technology type
Capacity (MW)	Decimal number	The maximum electric output an electricity generator can produce under specific conditions
Size (MWh)	Decimal number	Total potential power a storage system can contain
Duration	Decimal number	Number of hours of continuous discharge of power
Counterparties	Text	The names of the counterparties with anticipated or signed agreements for dedicated offtake from the project.
Contracted (MW)	Decimal number	The contracted or guaranteed peak power capacity of the project in megawatts (MW)
Contracted (MWh)	Decimal number	The contracted or guaranteed energy capacity of the project in megawatt-hours (MWh)
Contracted Capacity Details	Text	Description of the contracted capacity arrangement, such as the agreement type, key performance obligations, and any penalty or liquidated damages provisions for capacity shortfalls
Data Center Details	Text	Description of the project's relation to a data center, hyperscale facility, cloud campus, server farm, data processing facility, or similar, if applicable.
Announcement Date	Date	Earliest date with information on the project in Commission proceedings
Construction Start Date	Date	Expected or actual date for construction to begin
Commercial Operation Date	Date	Expected or actual date of commercial operation (COD)
Queue Number	Text	Unique identifier assigned to project by regional grid operator (ISO/RTO)
Project Status	Text	The project's current state at a high level: announced, in development, in construction, constructed, operating, or canceled
Study and Permit Status	Text	A more detailed status for the project, such as permitting, feasibility study, interconnection requested, interconnection agreement executed, energization, etc.
Status Description	Text	A long-form description of the project’s development status, including key milestones such as permitting progress, offtake agreement execution dates, and construction timing.
LGIA	True/False	True if the project has a Large Generator Interconnection Agreement for the project Click the citation to get to the latest LGIA
SGIA	True/False	True if the project has a Standard Generator Interconnection Agreement for the project Click the citation to get to the latest LGIA
EWG	True/False	True if the project has a Exempt Wholesale Generator filing for the project Click the citation to get to the latest LGIA
CPCN	True/False	True if the project has a Certificate of Public Convenience and Necessity for the project Click the citation to get to the latest LGIA
ESA	True/False	True if the project has a Energy Storage Agreement for the project These may be energy storage agreements, tolling agreements, power purchase agreements, or other agreements for offtake of storage capacity Click the citation to get to the latest LGIA
Inverter Size (kW)	Decimal number	Cumulative inverter size or power rating in kilowatts
Inverter Details	Text	Details such as the inverter configuration, make and model, number of units, and per unit rating
Inverter Make	Text	The supplier / manufacturer of the inverter
Inverter Model	Text	Specific model of the inverter
# Units	Whole number	Number of units of the inverter for the project
Battery Manufacturer	Text	The company that produces the battery cells / modules used in the project
Co-Located Generation	True/False	True if the BESS is co-located, paired, or hybridized with another generation facility (e.g., solar, wind, natural gas). False otherwise.
Co-Located Generation Details	Text	If co-located, details such as the name of the paired generation project, its capacity, the shared interconnection. Blank otherwise.
Behind-the-Meter	True/False	True if the energy storage is or will be installed on the customer's side of the utility meter. False otherwise.
Point of Interconnection	Text	The substation, bus, or transmission node where the BESS connects to the electric grid
Substation	Text	Name of the POI substation or switching station
Voltage		Kilovolts of the POI substation or switching station
Location Details	Text	Street address, city, or other description of the project location
Coordinates	Text	Latitude and longitude Exact coordinates or approximate at a street address level Projects with only an approximate location known (e.g., city, county) are blank
Parent Company	Text	The highest level company involved in developing or owning the project
Developers	Text	The companies responsible for developing, owning, or leading the construction of the project through its phases
CapEx ($M)	Decimal number	Anticipated upfront cost to build the project
Cost ($/kWh)	Decimal number	Capital cost per kilowatt hour of storage capacity
Cost ($/kW)	Decimal number	Capital cost per kilowatt of installed capacity
Cost Details	Text	Details around costs, such as regarding construction, battery stack, cost overruns, and more

Data Handling

To standardize information for convenient interpretation in the dataset, Halcyon converts some information into normalized formats. This is only done for clarity, never to “fudge” information. Halcyon’s #1 goal is to faithfully represent information presented in the regulatory record.

Type / Field	Description
Dates	Construction and commercial operation date are often disclosed as quarterly periods (e.g., “Q3 2026”). Halcyon converts these to dates based on the last day of the period (e.g., “Q3 2026” → “September 30, 2026”)
Coordinates	Halcyon provides latitude and longitude coordinates only when they are disclosed precisely. If the degrees-minutes-seconds (or decimal version) are disclosed in the regulatory record, we capture them. If the street address is provided, we approximate coordinates based on that address. But if the project’s location is only known to a city, county, or other high-level, then the Coordinates field is left blank.
Verified but not Cited	As of September 2026, Halcyon does not yet support citations to authoritative tabular sources such as the EIA 860, ERCOT interconnection queue xlsx, etc. Halcyon’s BESS Tracker includes information from those sources, such as developers, commercial operation dates, and more. These cells have no-citations but are verified with the source.