Barber Lake 300 MW HPC capacity
Company: Cipher Mining - Project: Barber Lake Facility
What the later record shows
The date slipped · new target December 31, 2026
The 300 MW gross facility is still under construction. The October 2026 lease start was replaced by phased delivery, with first rent expected in Q4 2026 and the remaining halls in Q1 2027.
“The Barber Lake Facility is being constructed on 250 acres of land owned by Cipher Barber Lake, and will have a gross capacity of 300 MW.”
2026-02-23 · Cipher Mining 10-K filed 2026-02-24 View cached copy (2026-08-31)Live source ↗
“Rent will commence for each data hall as it is delivered, with the first rent commencement expected to occur during the fourth quarter of 2026.”
2026-09-24 · Cipher Mining 8-K filed 2026-09-25 View cached copy (2026-09-26)Live source ↗
Checked October 10, 2026 against filings, releases and reporting published after the claim was made. Quotes are verbatim from the linked documents.
The claim, verbatim
Barber Lake data center with 300 MW gross capacity for HPC hosting
Source (primary)
cipher-mining 8-K exhibit (cipherdigital_businessup.htm) (SEC EDGAR (8-K Ex), press_release)
View cached copy (2026-09-13)Live source ↗
Quote: “300 MW Gross Capacity... 2026 Oct Lease Start Date”
How we checked this
Checked on October 11, 2026. The cited source supports every part of this claim.
The Barber Lake lease slide lists 300 MW of gross capacity for the Fluidstack HPC hosting lease. The pipeline chart also shows Barber Lake at 300 MW of contracted HPC capacity.
Confirmed in the source:
- Barber Lake has 300 MW of gross capacity
- Barber Lake's capacity is contracted for HPC hosting
What we did: Read our cached copy of SEC EDGAR (8-K Ex) (https://www.sec.gov/Archives/edgar/data/1819989/000181998926000007/cipherdigital_businessup.htm) in full (25,132 characters, retrieved September 13, 2026) and checked each assertion in the claim against it.
Additional evidence
confirms cipher-mining 8-K exhibit (cipherdigital_businessup.htm)
Quote: “300 MW Gross Capacity... 2026 Oct Lease Start Date”
delays Cipher Mining 10-K filed 2026-02-24
Quote: “The Barber Lake Facility is being constructed on 250 acres of land owned by Cipher Barber Lake, and will have a gross capacity of 300 MW.”
delays Cipher Mining 8-K filed 2026-09-25
Quote: “Rent will commence for each data hall as it is delivered, with the first rent commencement expected to occur during the fourth quarter of 2026.”