---
title: "Althea Storage"
description: "Althea Storage: 251 MW Battery project in Maverick County, ERCOT SOUTH developed by Sugaree Solar LLC. Currently IA, FIS pending; build-chance 80%. Independent ERCOT queue tracking by Matt Prusak."
canonical: "https://www.ercotqueue.com/project/27INR0465"
markdown: "https://www.ercotqueue.com/project/27INR0465.md"
resource_type: "project"
source_report: "August 2026"
generated_at: "2026-09-08T19:34:08.442Z"
license: "https://creativecommons.org/licenses/by/4.0/"
---

# Althea Storage

Althea Storage is an ERCOT generation interconnection record identified by INR 27INR0465.

## Current reported project fields

| Field | Value |
| --- | --- |
| INR | 27INR0465 |
| Developer | [Sugaree Solar LLC](https://www.ercotqueue.com/developer/sugaree-solar-llc.md) |
| Fuel / technology | Battery / BA |
| Capacity | 251.3 MW |
| County | Maverick County |
| ERCOT zone | SOUTH |
| Point of interconnection | Tap Escondido (8260) - Brackettville (8252) |
| Projected commercial-operation date | 2028-09-21 |
| Reported status | SS Completed, FIS Started, IA |
| Funnel stage | Interconnection agreement; FIS pending |

County is the public geographic precision used by ERCOTQueue. Map symbols are county-level evidence and are not exact project coordinates.

## Independently derived Build Chance

| Measure | Value |
| --- | ---: |
| Validation-selected Build Chance | 80% |
| P05 | 75% |
| P50 | 79% |
| P95 | 84% |

### Score factors

| Factor | Percentage-point contribution |
| --- | ---: |
| Stage base rate | +80.8 pp |
| Fuel adjustment | -2.9 pp |
| Developer-history adjustment | 0.0 pp |
| Stage-velocity adjustment | +4.1 pp |
| COD-slippage adjustment | -2.0 pp |
| FIS-progress adjustment | 0.0 pp |
| Capacity adjustment | +0.5 pp |

These factors are ERCOTQueue derivations. The displayed probability is not an ERCOT forecast or an official project status.

## Reported milestones

| Milestone | Date |
| --- | --- |
| screening started | 2025-02-12 |
| screening complete | 2025-04-22 |
| fis requested | 2024-12-30 |
| ia signed | 2025-09-29 |

## Observed monthly history

- First seen: 2025-01
- Last seen: 2026-08
- Appearances: 20
- Score-series basis: Monthly points use the as-of seven-factor raw model on the validation-selected raw scale because the current isotonic candidate did not pass the project-purged application guard. The final point is anchored to the published current project score. The series shows trajectory, not a previously published frozen forecast.

The 30 most recent observed changes are shown below. The public JSON contains the complete history.

| Report month | Change | Detail |
| --- | --- | --- |
| 2025-09 | Developer field | Althea Storage LLC to Sugaree Solar LLC |
| 2025-09 | Funnel stage | No IA to IA signed, FIS pending |
| 2025-06 | Projected COD | 2027-12-15 to 2028-09-21 (+9 months) |
| 2025-01 | Funnel stage | First observation to No IA |

Complete project-history JSON: [https://www.ercotqueue.com/data/project_history/27INR0465.json](https://www.ercotqueue.com/data/project_history/27INR0465.json)

## Field provenance

- Reported fields: INR, name, developer, capacity, fuel, county, zone, point of interconnection, projected COD, status, and dated milestones.
- Derived fields: funnel stage, COD-delay indicators, Build Chance, factor contributions, and uncertainty range.
- Current project dataset: [https://www.ercotqueue.com/data/projects.json](https://www.ercotqueue.com/data/projects.json)
- Current flat CSV: [https://www.ercotqueue.com/data/projects.csv](https://www.ercotqueue.com/data/projects.csv)

## Source, citation, and reuse

- Human-readable page: [Althea Storage](https://www.ercotqueue.com/project/27INR0465)
- Markdown representation: [https://www.ercotqueue.com/project/27INR0465.md](https://www.ercotqueue.com/project/27INR0465.md)
- Source report: August 2026
- Site refresh: September 2026
- Methodology: [ERCOTQueue methodology](https://www.ercotqueue.com/methodology)
- License: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/)
- Source data (application/json): [https://www.ercotqueue.com/data/projects.json](https://www.ercotqueue.com/data/projects.json)

ERCOTQueue distinguishes reported source fields from independently derived analysis. Queue capacity records development and interconnection activity; it does not establish financing, construction, or commercial operation. Build Chance is a research signal, not a guarantee or investment recommendation.