Alterra Marshall site

The project

Electrical demand

No capacity figure on the record

Developer

Alterra Development

Serving utility

Consumers Energy

Site size

270 acres

Also on the record

An application is anticipated but not yet on file.

Last checked August 21, 2026. Every field above has been confirmed against the sources listed.

What Consumers Energy customers pay, before and now

Those figures are Consumers Energy’s own EIA-861 filings and they cover the whole territory. This page does not attribute any part of that change to Alterra Marshall site. It could not honestly: the change spans years in which this project did not exist, rates move for generation costs, storm recovery, tree trimming and approved return on equity all at once, and the large-load terms the Commission has approved are written specifically to keep these costs off other customers’ bills. Whether they succeed is an open question in front of the Commission, not a settled fact this site can assert.

What actually did change Consumers Energy rates, case by case →

The terms a large load takes service under here

Consumers Energy operates under U-21859, approved November 6, 2025. Amended the General Service Primary Demand tariff to set standard terms for very large customers, rather than negotiating each one privately.

Who it applies to

New customers with 100 MW or more at one site, or an aggregated 100 MW across sites under common ownership with at least 20 MW each.

Contract length

At least 15 years, renewing automatically in 5-year terms absent four years' notice.

Minimum billing demand

After any ramp-up, the customer pays for at least 80% of contracted demand whether or not it uses it.

Financial assurance

A letter of credit or cash deposit sufficient to cover the exit fee, posted up front.

Exit fee

Minimum billing demand multiplied by the months remaining, including infrastructure costs. Capacity may be cut up to 10% on four years' notice without penalty; deeper cuts are pro-rated or reviewed by the Commission.

Cost-shift test

Before serving a large-load customer, Consumers must file an ex parte application demonstrating costs are not being shifted onto other customers. A $100,000 administrative fee covers project evaluation.

• Michigan Public Service Commission: MPSC approves terms of service between Consumers Energy and data centers, other very large customers; adds protections for existing customers

Sources

Everything above traces to one of these. Local agendas and FAQ pages get replaced in place rather than archived, so each carries the date it was read.

1. [1] How many AI data centers are planned in Michigan? We counted. — Gander Newsroom, read August 21, 2026

Watch the docket this project runs through

Large-load contracts, tariff changes and the cases contesting them all arrive as Consumers Energy filings. Alerts go out when one is filed and when a comment deadline is set — which is the only window in which a comment counts for anything.