Cipher agrees to cover the approximately $359 million over-budget initial phase of Barber Lake.

According to Miner Weekly, one of the most telling metrics in this quarter’s financial filings appears in Cipher Mining’s lease disclosures: The company has agreed under a revised lease structure to cover the first $359.3 million in excess costs for the Barber Lake project above the original budget. Beyond that threshold, tenants will split half of the additional costs via extra rent over the 20-year total contract term, with corresponding returns agreed. This figure is a contractual threshold, not the final total project overrun, but it highlights a key question: who bears costs when delivery expenses rise after AI lease signings. Cipher’s management noted both parties were eager to move forward, so the lease was signed before design was fully finalized, leading to more change orders than expected. Modifications such as cooling facilities required additional construction and disrupted other workflows. Other issues included lower-than-expected productivity, delayed equipment deliveries, and idle labor, though equipment price hikes were not the primary driver. The company said future leases will only be signed once design is roughly 30%–60% complete. Riot Platforms also addressed industry cost overruns and its Rockdale project budget, stating that around 70% of the total budget will likely fall under the general contractor’s guaranteed maximum price framework, and it maintains an estimate of $11 million–$12 million per critical IT megawatt. Under the new Corsicana arrangement, tenants procure and own modular deployments; Riot estimates the total cost, including tenant reimbursements and site works, at roughly $6 million per megawatt. Core Scientific, for its part, disclosed outstanding procurement and construction commitments of approximately $4.4 billion. Of that, modifications related to CoreWeave are almost entirely funded by customers, with a cap on the company’s contributions, while AMD and Neocloud expansions lack equivalent protections.