---
title: "Megamouth Energy Storage"
description: "Megamouth Energy Storage: 101 MW Battery project in Harris County, ERCOT HOUSTON developed by GCI Megamouth, LLC. Currently IA + FIS complete; build-chance 65%. Independent ERCOT queue tracking by Matt Prusak."
canonical: "https://www.ercotqueue.com/project/26INR0341"
markdown: "https://www.ercotqueue.com/project/26INR0341.md"
resource_type: "project"
source_report: "September 2026"
generated_at: "2026-10-06T16:51:52.234Z"
license: "https://creativecommons.org/licenses/by/4.0/"
---

# Megamouth Energy Storage

Megamouth Energy Storage is an ERCOT generation interconnection record identified by INR 26INR0341.

## Current reported project fields

| Field | Value |
| --- | --- |
| INR | 26INR0341 |
| Developer | [GCI Megamouth, LLC](https://www.ercotqueue.com/developer/gci-megamouth-llc.md) |
| Fuel / technology | Battery / BA |
| Capacity | 101.3 MW |
| County | Harris County |
| ERCOT zone | HOUSTON |
| Point of interconnection | 42750 Mykawa 138 kV |
| Projected commercial-operation date | 2028-12-31 |
| Reported status | SS Completed, FIS Completed, IA |
| Funnel stage | Interconnection agreement and FIS complete |

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 | 65% |
| P05 | 53% |
| P50 | 64% |
| P95 | 74% |

### Score factors

| Factor | Percentage-point contribution |
| --- | ---: |
| Stage base rate | +83.3 pp |
| Fuel adjustment | -3.1 pp |
| Developer-history adjustment | 0.0 pp |
| Stage-velocity adjustment | -10.0 pp |
| COD-slippage adjustment | -5.0 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 | 2024-03-22 |
| screening complete | 2024-06-19 |
| fis requested | 2024-03-11 |
| fis approved | 2024-09-17 |
| ia signed | 2025-11-18 |

## Observed monthly history

- First seen: 2024-03
- Last seen: 2026-09
- Appearances: 30
- 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 |
| --- | --- | --- |
| 2025-11 | Projected COD | 2027-10-01 to 2028-12-31 (+14 months) |
| 2025-11 | Funnel stage | No IA to IA + FIS complete |
| 2025-10 | Projected COD | 2026-09-01 to 2027-10-01 (+13 months) |
| 2024-04 | Projected COD | 2026-06-01 to 2026-09-01 (+3 months) |
| 2024-03 | Funnel stage | First observation to No IA |

Complete project-history JSON: [https://www.ercotqueue.com/data/project_history/26INR0341.json](https://www.ercotqueue.com/data/project_history/26INR0341.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: [Megamouth Energy Storage](https://www.ercotqueue.com/project/26INR0341)
- Markdown representation: [https://www.ercotqueue.com/project/26INR0341.md](https://www.ercotqueue.com/project/26INR0341.md)
- Source report: September 2026
- Site refresh: October 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.