Millers Branch Solar I

ERCOT-22INR0270BetaActiveSolarERCOTLBNL

200 MW generation in Haskell, TX · In queue since December 2019 · Proposed COD December 2025

BA: ERCOISO/RTO: ERCOTNERC: TRERC: ERCOT

200 MW

Capacity

Components

Solar

6y 7m

In Queue

IA Executed

IA Phase

Signed Jun 2021

Status

as of 2y 2m ago

Latest milestonecapacity expansion announcedPV Tech · 2024-05-02

Expected CODQ2 2026PV Tech · 2024-05-02

Interconnection

Queue → IA

1y 6m

IA → COD

4y 6m

Total Duration

1y 6m

Schedule

6 months past proposed COD

Construction75%

Queue EntryDec 17, 2019

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 AgreementJun 14, 2021

Interconnection agreement executed — binding commitment to build

Typical: 30–60 days (negotiation)

ConstructionCurrent

Project under construction

Typical: 12–24 months

Commercial Operation

Proposed COD: 2025-12-30

Cross-source intelligence

Beta

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

Expected COD

Jun 2026

Queue date 1–2 years staleQueue: 2025-12-30

Developer

Southern Power

Filed as Miller's Branch Solar, LLC

Status

Active

Active — under construction with phased expansion to 512 MW total capacity, Q2 2026 COD target

Financing

Secured

Financing secured through Southern Power acquisition and subsequent expansion announcements; specific financing amounts not publicly disclosed but project is fully funded and under construction

Ownership history

2023-09·EDF Renewables→Southern Powersource

Key milestones

IA executedJun 14, 2021

Interconnection Agreement executed with ERCOT

source

Ownership changeSep 2023

Southern Power acquired 200 MW Millers Branch project from EDF Renewables with expansion potential to 500 MW

source

GroundbreakingMay 2024

Construction phase with 180 MW capacity expansion announced

source

Financing closeNov 2024

Further expansion announced bringing total capacity to 512 MW

source

COD targetJun 2026Most recent

Expected commercial operation Q2 2026 for expanded facility

source

Project lifecycle

as of 2024-05-02

PhaseConstructionPV Tech · 2024-05-02

OperationalNoPV Tech · 2024-05-02

TechnologySolarPV Tech · 2024-05-02

DeveloperSouthern PowerPV Tech · 2024-05-02

PPA offtakerNet Zero Consortium for Buyers (Bio-Rad Laboratories, Cadence Design Systems, Cisco, IDEXX Laboratories, Juniper Networks, PTC)PV Tech · 2024-05-02

About

Millers Branch Solar I is a proposed 200 MW solar generation project located in Haskell County, Texas. The developer is Miller's Branch Solar, LLC. The project is in the ERCOT interconnection queue as entry ERCOT-22INR0270, with a queue entry date of December 17, 2019, and a proposed commercial operation date of December 1, 2025. The project's Interconnection Agreement (IA) was executed on June 14, 2021.

The Millers Branch Solar I project has been featured in 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

County

Haskell

Grid Region

ERCOT (Texas)

Market

ISO/RTO Member

Developer

Miller's Branch Solar, LLC

Utility

—

Entity

ERCOT

Service Type

—

Point of Interconnection

Tap 345kV 60703 Gauss - 60514 Clear Crossing (60712 QUASAR)

Data Source

LBNL

DeveloperSouthern PowerPV Tech · 2024-05-02

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: MEDIUM
POI Substation: Gauss 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.

Insights & Articles (1)Beta

Last updated 2026-04-19

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

Millers Branch Solar I (ERCOT-22INR0270) — Project Summary

Millers Branch Solar I