Tierra Seca BESS

ERCOT-23INR0364BetaActiveBatteryERCOTLBNL

102.7 MW storage in Val Verde, TX · In queue since August 2021 · Proposed COD January 2026

BA: ERCOISO/RTO: ERCOTNERC: TRERC: ERCOT

102.7 MW

Capacity

Components

Battery

4y 11m

In Queue

IA Executed

IA Phase

Signed May 2023

Interconnection

Queue → IA

1y 9m

IA → COD

2y 8m

Total Duration

1y 9m

Schedule

5 months past proposed COD

Construction75%

Queue EntryAug 24, 2021

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 AgreementMay 18, 2023

Interconnection agreement executed — binding commitment to build

Typical: 30–60 days (negotiation)

ConstructionCurrent

Project under construction

Typical: 6–18 months

Commercial Operation

Proposed COD: 2026-01-29

Cross-source intelligence

Beta

High confidence·5 sources·as of 2026-06-01

Expected COD

2026-05-12

Queue date 1–2 years staleQueue: 2026-01-29

Developer

Spearmint Energy

Filed as Tierra Seca BESS LLC

Status

Online

Online — COD confirmed May 12, 2026 per Renewables Now; interconnection.fyi also lists as operational

Financing

Secured

$252 million financing closed April 2025, led by undisclosed lenders, advised by Paul Hastings for Tierra Seca and Seven Flags BESS pair

Key milestones

IA executedMay 18, 2023

Interconnection Agreement executed with ERCOT

source

Financing closeApr 2025

$252M financing closed for Tierra Seca and Seven Flags BESS projects

source

COD targetMay 12, 2026Most recent

Commercial operation date confirmed for 100MW/200MWh Tierra Seca BESS in Del Rio

source

About

Tierra Seca BESS is a proposed 102.7 MW battery storage project in Val Verde County, Texas. Developed by Tierra Seca BESS LLC, the project entered the ERCOT interconnection queue as queue ID ERCOT-23INR0364 on August 24, 2021, with a proposed commercial operation date of October 1, 2025. The project has an Interconnection Agreement (IA) executed on May 18, 2023.

The proposed project is linked to the existing Tierra Seca operating plant (EIA plant ID 68748). Recent news coverage has discussed the development.

Generated from interconnection queue and public data sources

ERCOT Queue EIA Plant Profile

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.

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See the full development-risk decomposition for this project.

P(COD by stated date)

Financing close probability

EPC + tax-equity counterparty

Project Details

State

County

Val Verde

Grid Region

ERCOT (Texas)

Market

ISO/RTO Member

Developer

Tierra Seca BESS LLC

Utility

—

Entity

ERCOT

Service Type

—

Point of Interconnection

138kV 8255 HAMILTON4A (Hamilton Road Substation)

Data Source

LBNL

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_SOUTH
Hub Confidence: MEDIUM
Nearest Node (Estimated): HAMI_BESS_RN
POI Substation: Del Rio Substation

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.

Linked EIA Plant

Tierra SecaEIA 68748

High match91% confidence

View Plant

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InfraSure platform

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

Tierra Seca BESS (ERCOT-23INR0364) — Project Summary

Tierra Seca BESS