Mainland

HEN Infrastructure, L.L.C.Galveston CountyERCOT

Mainland is a 9.9 MW battery energy storage facility located in Galveston County, Texas, serving ERCOT's Houston congestion zone. The facility entered commercial operation in June 2024 and is owned and operated by HEN Infrastructure, L.L.C., with development and operations management by Hunt Energy Network. It is a distribution-level storage resource registered to participate in ERCOT energy and ancillary-services markets.

Website Open in grid

Overview

Nameplate capacity: 9.9 MW
Canonical EIA plant baseline.
Registry anchor: Plant 67494
plant-67494

Structured profile

Technology: Batteries
Operator: HEN Infrastructure, L.L.C.

Mainland

HEN Infrastructure, L.L.C.Galveston CountyERCOT

Mainland is a 9.9 MW battery energy storage facility located in Galveston County, Texas, serving ERCOT's Houston congestion zone. The facility entered commercial operation in June 2024 and is owned and operated by HEN Infrastructure, L.L.C., with development and operations management by Hunt Energy Network. It is a distribution-level storage resource registered to participate in ERCOT energy and ancillary-services markets.

Website Open in grid

Overview

Nameplate capacity: 9.9 MW
Canonical EIA plant baseline.
Registry anchor: Plant 67494
plant-67494

Structured profile

Technology: Batteries
Operator: HEN Infrastructure, L.L.C.

Same typeComparable scale30 mi away

Compare with this plant

Grid and market context

Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.

Interconnection record

ERCOT GIS Report

Queue project

Mainland BESS

high match · 100/100 · project name, county, capacity

Queue ID / status

24INR0624 · Commissioned

Point of interconnection

Substation/BUS#/ERCOTBUS/ERCOTLOAD/DAC MAINLAND/38830/TNMAINLAND1/MAINLD_2/MAINLAND_DL1

Interconnecting entity

HEN INFRASTRUCTURE LLC 1

Transmission owner

Not disclosed

Technology

Other

Requested capacity

9.9 MW

Queue milestones

Completed Jun 21, 2024

Queue entered Jun 21, 2024

Matched to the latest available ERCOT generation-interconnection queue record. Queue status and completion dates describe the queue record; operating status is verified separately against plant and market registrations.

Nearby substations

HIFLD infrastructure inventory

TAP307990

IN SERVICE · 138 kV

3.3 km

FREEWAY PARK

IN SERVICE · 138 kV

4.5 km

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Transactions and agreements

Commercial Operation

Jun 21, 2024

Mainland BESS entered commercial operation per Texas PUC generating-capacity report.

HEN Infrastructure, L.L.C. · Hunt Energy Network, L.L.C.

interchange.puc.texas.gov

Regulatory Filing

Feb 27, 2026

HEN Infrastructure filed 2026 Electric Generating Capacity Report with Texas PUC listing Mainland at 9.9 MW in Galveston County, TNMP utility, ERCOT Houston zone.

HEN Infrastructure, L.L.C. · Public Utility Commission of Texas

interchange.puc.texas.gov

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Relationship graph

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AssetOrganizationFinancier

Parties and identifiers

OrganizationRoleBasis

HEN Infrastructure, L.L.C.Owner / operatorRegistered utility/transmission owner and power generation company

Manulife Investment ManagementFinancier / equity investorEquity partner for asset development

plant:plant-67494Grid selectionCanonical asset page /assets/facilities/mainland.

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Jun 21, 2024
Jun 21, 2024
Commercial Operationinterchange...
Mainland BESS entered commercial operation per Texas PUC generating-capacity report.
Feb 27, 2026
Feb 27, 2026
2026 PUC capacity report filinginterchange...
HEN Infrastructure filed 2026 Electric Generating Capacity Report with Texas PUC listing Mainland at 9.9 MW in Galveston County, TNMP utility, ERCOT Houston zone.

Sources

PublisherReferenceType

interchange.puc.texas.govinterchange.puc.texas.govauthoritative

modo-content-service-prod.s3.amazonaws.commodo-content-service-prod.s3.amazonaws.compublic_source

huntenergynetwork.comhuntenergynetwork.compublic_source

Common questions about Mainland

Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.

How big is Mainland?

Mainland has a reported capacity of 9.9 MW. Source: EIA Form 860M.

What kind of plant is Mainland?

Mainland is a batteries facility in Galveston County, TX, participating in the ERCOT market.

Where is Mainland located?

Mainland is in Galveston County, TX, inside the ERCOT balancing area.

Who operates Mainland?

Mainland is operated by HEN Infrastructure, L.L.C. according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

Co-located assets

Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.