Cipher Mining secures 300 MW ERCOT capacity for AI data center lease

Cipher Mining disclosed a conditional deal for up to 300 MW of ERCOT interconnection capacity paired with a 15-year hyperscaler master lease, deepening its shift from pure Bitcoin mining into AI and high-performance computing infrastructure. The disclosure, made in a filing with the Securities and Exchange Commission, does not name the hyperscaler tenant, leaving the counterparty undisclosed.

• Cipher Mining disclosed conditional ERCOT interconnection capacity for up to 300 MW in a September 21 filing.
• The company also reported a 15-year hyperscaler master lease tied to HPC data-center infrastructure.
• The SEC filing does not identify the hyperscaler tenant, leaving the counterparty unconfirmed.

• 300 MW conditional ERCOT interconnection capacity disclosed in the filing
• 15 years length of the hyperscaler master lease term disclosed
• Sep 21 date Cipher Mining filed the disclosure with the SEC

Cipher Mining, a Bitcoin mining company that has built out substantial power and site infrastructure in Texas, filed the disclosure with the SEC on September 21, according to reporting by NewsBTC. The filing outlines conditional interconnection capacity of up to 300 MW with the Electric Reliability Council of Texas, the grid operator known as ERCOT, alongside a separate 15-year master lease tied to high-performance computing data-center infrastructure for an unnamed hyperscaler.

The filing frames both elements as part of the same infrastructure push. Cipher is using power assets originally built for mining to support longer-term computing contracts.

Cipher ties 300 MW ERCOT Capacity to AI buildout

Power access has become one of the most contested and valuable assets across both Bitcoin mining and AI data centers. Mining companies like Cipher already hold large power interconnections, land parcels and electrical infrastructure built up over years of grid negotiations and site development.

As AI workload demand grows, some mining operators are converting part of that existing footprint into higher-value hosting arrangements rather than building new capacity from scratch. Cipher’s 300 MW ERCOT allocation, disclosed as conditional rather than finalized, positions the company to redirect grid access toward computing tenants instead of, or alongside, mining rigs.

The 300 MW figure applies specifically to the ERCOT interconnection. The separate 15-year term applies only to the hyperscaler master lease, not to the power capacity itself.

15-Year hyperscaler lease leaves tenant unnamed

The SEC filing does not identify the hyperscaler tied to the master lease. Attaching a specific technology company to the arrangement would go beyond what the filing or NewsBTC’s reporting supports, and no other outlet or company statement fills that gap as of this writing.

That omission leaves the tenant’s identity as an open question rather than a settled fact. What the filing does establish is the strategic direction: Cipher is building infrastructure capacity that can serve computing demand beyond its Bitcoin mining operations, using the same power and site-development skills across both markets.

For miners generally, long-term data-center leases can also change the revenue profile. A 15-year hosting contract reduces dependence on Bitcoin’s price and network difficulty compared with mining revenue alone.

Mining business continues alongside HPC push

The September 21 filing does not indicate that mining disappears from Cipher’s business. Instead, it shows the company attempting to monetize the same power and site assets across both crypto mining and AI or HPC markets simultaneously.

No financial terms, capacity utilization figures or lease revenue estimates accompany the disclosure. The filing establishes the structure of the deal without pricing it.

The BlockWest read. For allocators watching miner balance sheets, the unnamed 15-year lease matters more than the 300 MW headline. A locked-in hyperscaler contract of that length signals Cipher wants predictable, non-Bitcoin cash flow layered onto volatile mining revenue, a structural hedge other miners with spare grid capacity will likely try to replicate as AI demand for power outpaces new grid connections.

Cipher Mining has not disclosed the hyperscaler tenant’s name, the lease’s dollar value, or when the conditional ERCOT capacity becomes final, leaving those details as the next facts to watch for in future filings or company statements.

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