Bufflehead BESS (ERCOT-24INR0274) — Project Summary

Queue ID
ERCOT-24INR0274
Capacity
153.3 MW
Technology
Battery
Status
active
Location
Collin, TX
Region
ERCOT
Developer
Boxcar Energy Storage, LLC
IA Status
IA Executed

Bufflehead BESS

ERCOT-24INR0274BetaActiveBatteryERCOTLBNL + Live

153.3 MW storage in Collin, TX · In queue since March 2022 · Proposed COD February 2027

BA: ERCOISO/RTO: ERCOTNERC: TRERC: ERCOT

153.3 MW

Capacity

1

Components

Battery

4y 4m

In Queue

IA Executed

IA Phase

Signed Apr 2024

Interconnection

Queue → IA

2y 1m

IA → COD

2y 10m

Total Duration

2y 1m

Construction75%
Queue EntryMar 7, 2022

Interconnection request submitted to ISO/RTO

Interconnection Study

ERCOT uses a serial "connect and manage" approach — fastest among major ISOs.

Typical: 18–30 months (fastest major ISO)

Interconnection AgreementApr 10, 2024

Interconnection agreement executed — binding commitment to build

Typical: 30–60 days (negotiation)

ConstructionCurrent

Project under construction

Typical: 6–18 months

Commercial Operation

Proposed COD: 2027-02-15

Cross-source intelligence
Beta
High confidence·4 sources·as of 2026-06-01
Expected COD
2027-02-15
From queue filing
Developer
esVolta
Recent ownership change
Status
IA Executed
IA Executed — project acquired by esVolta in Q1 2025, advancing toward 2027 COD
Financing
Unannounced
Ownership history
  1. 2025-03·Boxcar Energy Storage, LLC / Black Mountain Energy Storage→esVoltasource
Key milestones
IA executedApr 10, 2024

Standard Generation Interconnection Agreement executed with Oncor Electric Delivery

source
Ownership changeMar 2025Most recent

esVolta acquired 150MW/300MWh BESS from Black Mountain Energy Storage

source
About

Bufflehead BESS is a proposed 159.23 MW battery storage project in Collin County, Texas. Developed by Boxcar Energy Storage, LLC, the project is located within the ERCOT region and consists entirely of battery storage. It entered the ERCOT interconnection queue as queue ID ERCOT-24INR0274 on March 7, 2022, with a proposed commercial operation date of February 15, 2027.

The project's Interconnection Agreement (IA) was executed on April 10, 2024. The point of interconnection is the 2475 Lavon Switch 138kV. The Bufflehead BESS project has been the subject of recent news coverage.

Generated from interconnection queue and public data sources

ERCOT Queue
Development Risk

Realization risk from now to commercial operation — financing close, EPC and tax-equity counterparty mix, and COD probability vs the proposed date. The diligence view that determines whether the deal actually closes. Powered by InfraSure's development-stage modeling stack.

Available on the InfraSure platform

See the full development-risk decomposition for this project.

P(COD by stated date)
Financing close probability
EPC + tax-equity counterparty
Project Details

State

TX

County

Collin

Grid Region

ERCOT (Texas)

Market

ISO/RTO Member

Developer

Boxcar Energy Storage, LLC

Utility

—

Entity

ERCOT

Service Type

—

Point of Interconnection

2475 Lavon Switch 138kV

Data Source

LBNL + Live

Risk Analytics

Composite operating-phase risk view — what this asset's risk profile will look like once it commissions. Climate hazards across its operating life, expected generation variability, and offtake counterparty exposure, decomposed into a single decision-grade score. Powered by InfraRisk.

Available on the InfraSure platform

See the full risk decomposition + scenarios for this project.

Climate hazards (8+)
Generation variability (P10/P50/P90)
Offtake + transmission counterparty
Generation Forecast

Forward generation outlook — first-year production estimate and 10-year P50 trajectory, with probabilistic ranges (P10/P50/P90) across weather, demand, and policy scenarios. Powered by InfraSure's generation modeling stack.

Available on the InfraSure platform

See the full forecast + scenario decomposition for this project.

10-year P50 forecast
First-year output estimate
Weather + policy scenarios
Financial Forecast

Forward revenue, DSCR projection, and financing-close risk — conditioned on commercial operation. First-year DSCR, 10-year cashflow, and counterparty exposure across price and policy scenarios. Powered by InfraSure's asset cashflow stack.

Available on the InfraSure platform

See the full revenue + DSCR projection for this project.

10-year revenue projection
First-year DSCR
Financing close risk
Market Context
Approximate
ISO / RTO
ERCOT
Trading Hub
HB_NORTH
Hub Confidence
LOW

This project's market context is estimated from its Point of Interconnection. Hub and node assignments are approximate and based on geographic inference from the POI substation name.

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InfraSure platform

Forward forecasts, scenario decomposition, and risk-decision tooling for this queue project.