Millers Branch Solar II

ERCOT-24INR0044BetaActiveSolarERCOTLBNL + Live

178 MW generation in Haskell, TX · In queue since November 2021 · Proposed COD May 2026

BA: ERCOISO/RTO: ERCOTNERC: TRERC: ERCOT

178 MW

Capacity

Components

Solar

4y 8m

In Queue

IA Executed

IA Phase

COD target: 2026

Interconnection

Total Duration

4y 6m

Schedule

2 months past proposed COD

Construction75%

Queue EntryNov 4, 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 Agreement

Interconnection agreement executed — binding commitment to build

Typical: 30–60 days (negotiation)

ConstructionCurrent

Project under construction

Typical: 12–24 months

Commercial Operation

Proposed COD: 2026-05-01

Cross-source intelligence

Beta

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

Expected COD

2026-05-01

From queue filing

Developer

Southern Power

Recent ownership change

Status

Active

Active — Phase II (178 MW) in development as part of multi-phase Millers Branch expansion (Phase I: 200MW, Phase II: 180MW, Phase III: 132MW announced Nov 2024)

Financing

Secured

Southern Power acquisition and expansion financing in place (parent Southern Company NYSE:SO); specific Phase II financing amount not disclosed in public sources

Ownership history

2023-09·EDF Renewables→Southern Powersource

Key milestones

IA executedNov 4, 2021

Interconnection Agreement executed for Phase II (178 MW) in ERCOT queue

source

Ownership changeSep 2023

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

source

Financing closeNov 2024

Phase III expansion (132 MW) announced, confirming ongoing investment in multi-phase facility

source

COD targetMay 1, 2026Most recent

Phase II expected online May 2026 per LBNL queue data

source

About

Millers Branch Solar II is a proposed 178 MW solar generation project located in Haskell County, Texas. The project, developed by Miller's Branch Solar, LLC, is in the ERCOT interconnection queue as entry ERCOT-24INR0044, with a queue entry date of November 4, 2021. The proposed commercial operation date is May 1, 2026. The project's interconnection agreement status is currently in the Facility Study phase.

The point of interconnection for Millers Branch Solar II is Tap 345kV 60703 Gauss - 60514 Clear Crossing (60712 QUASAR). The project has appeared in recent news coverage regarding renewable energy development in Texas.

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 + 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: 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.

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InfraSure platform

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

Millers Branch Solar II (ERCOT-24INR0044) — Project Summary

Millers Branch Solar II