Utility Tariff Analysis · Updated September 2026

Special Contracts Under Mississippi PUC Rule 27: What It Means for AI Data Center Siting in Mississippi

September 18, 2026 6 min read Strategic Crypto Reserve Data Center Infrastructure

Any large load negotiated under a Public Service Commission-approved special contract can be structured through special contracts between the utility and customer under Rule 27 of the Mississippi Public Utilities Rules of Practice and Procedure, which must be approved by the Public Service Commission and can incorporate minimum billing, financial assurance and exit-fee terms.

Mississippi at a glance: industrial power about 8.0¢/kWh (EIA-based, indexed to April 2026) · grid queue about 28 months · data center equipment tax exemption: available. Indicative figures from the SCR AI Build Configurator v1.4.0.

The Tariff Explained Model a Mississippi Build Free
Mississippi AI data center power map: Special Contracts Under Mississippi PUC Rule 27 large-load tariff

Special Contracts Under Mississippi PUC Rule 27

MS

Entergy Mississippi / Mississippi Power

MS Public Utilities RPP Rule 27

Regulatory docket / filing reference

Any large load negotiated under a Public Service Commission-approved special contract

Who the tariff applies to

Any large load negotiated under a Public Service Commission-approved special contract can be structured through special contracts between the utility and customer under Rule 27 of the Mississippi Public Utilities Rules of Practice and Procedure, which must be approved by the Public Service Commission and can incorporate minimum billing, financial assurance and exit-fee terms.

Also active in Mississippi: Mississippi's pipeline is exceptionally large relative to the state's size: Entergy Mississippi is serving a $21 billion, two-complex AWS commitment projected to deliver $2 billion in net benefits including $1.3 billion in generation-cost savings, and Mississippi Power is serving a $10 billion, roughly 500 MW Compass Datacenters campus in Meridian.

Mississippi at a glance: large-load tariff threshold, docket and who it applies to

Named Projects Already Underway

CustomerLocationDetails
AWSMadison County, MS$21 billion investment across two data center complexes; project to contribute $2 billion in net benefits including $1.3 billion in generation-cost savings and $700 million in fuel-cost savings
Compass DatacentersMeridian, MS$10 billion data center campus, approximately 500 MW across eight buildings

Figures compiled from the Edison Electric Institute's "Large Load Projects and Tariffs" (September 2026) member-company summary and public regulatory filings. Confirm current tariff terms directly with Entergy Mississippi / Mississippi Power and the relevant state public utility commission before relying on any figure for a capital decision.

Weighing Mississippi against another state or a Canadian province with a different rate and interconnection picture entirely? Run both sides of the comparison through our licensed AI data center cost configurator — it applies each jurisdiction's actual power rate, tax treatment and large-load tariff rules to the same seven build configurations.

Named data center projects underway in Mississippi Named Projects Already Underway: Special Contracts Under Mississippi PUC Rule 27: What It Means for AI Data Center Siting in Mississippi

Model This State on Your Own Site

Every figure above comes from the same power-cost and tariff dataset behind the SCR AI Build Configurator — a licensed, embeddable widget that models seven data center build configurations against all nine Canadian provinces and all 50 US states plus DC, returning capital expenditure by line item, energy cost, revenue by commercial structure, EBITDA and payback.

LicencePrice (CAD)Who it suits
Standard$4,000 / domain / yearAdvisors who need three lease-model configurations and a clipboard summary
Pro$10,000 / domain / yearConsultants who send CSV deliverables to clients and want all seven configurations
EnterpriseFrom $25,000 / year, up to 3 domainsDevelopers and EPC firms who want the model on their own cost basis with attribution removed

Not ready for an annual licence? A one-time Site Screening Report ($950, one site) runs the same model for a single build without embedding anything.

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Model a Mississippi data center build in the SCR AI Build Configurator: CapEx, power cost, EBITDA and payback Model This State on Your Own Site: Special Contracts Under Mississippi PUC Rule 27: What It Means for AI Data Center Siting in Mississippi

Compare Mississippi With Nearby States

Large-load rules change sharply at state lines. See how the neighbouring utilities handle data center and high-density loads before you shortlist a site.

Louisiana

Entergy Louisiana (70 MW, 80%)
Alabama

Alabama Power Rate BTAL (30 MW)
Tennessee

TVA capacity charge (5 MW)
Arkansas

Entergy Arkansas Jobs Act rider
All 50 State Tariffs Data Center Cost Calculator AI Build Configurations

Frequently Asked Questions

What is Special Contracts Under Mississippi PUC Rule 27?

Any large load negotiated under a Public Service Commission-approved special contract can be structured through special contracts between the utility and customer under Rule 27 of the Mississippi Public Utilities Rules of Practice and Procedure, which must be approved by the Public Service Commission and can incorporate minimum billing, financial assurance and exit-fee terms.

Why did Entergy Mississippi / Mississippi Power introduce this large-load structure?

To ensure the cost of new generation, transmission and distribution infrastructure built to serve very large customers, chiefly hyperscale data centers, is paid for by those customers rather than spread across the general rate base of residential and small commercial ratepayers.

What large data center projects are already active in Mississippi?

Mississippi's pipeline is exceptionally large relative to the state's size: Entergy Mississippi is serving a $21 billion, two-complex AWS commitment projected to deliver $2 billion in net benefits including $1.3 billion in generation-cost savings, and Mississippi Power is serving a $10 billion, roughly 500 MW Compass Datacenters campus in Meridian.

Does this tariff replace Mississippi's standard commercial and industrial rates?

No. Special Contracts Under Mississippi PUC Rule 27 sits above Entergy Mississippi / Mississippi Power's standard commercial and industrial rate schedules and applies specifically to customers that meet or exceed the large-load threshold described above. Smaller commercial and industrial loads continue to be billed under existing rate schedules.

How can I model a Mississippi data center build against this tariff and other states?

The SCR AI Build Configurator applies Mississippi's power cost, tax treatment and large-load tariff rules alongside all other US states and Canadian provinces, so a Mississippi scenario can be compared line-by-line against any alternative site.