Data center debt: reconcile power, cooling and customer commencement

Data center financing depends on more than building area. The property must have the power, cooling, connectivity and operational readiness required by its customer agreements. A shell can be physically complete while revenue remains contingent on utility energization, commissioning or customer acceptance. The debt model should connect each revenue line to those dependencies and their evidence.

Digital Realty’s 2025 Form 10-K explains that available space can be constrained by electrical power and that power and cooling obligations can create operating exposure. This is a primary issuer description of infrastructure dependence, not a conclusion about the capacity of another facility. Digital Realty, 2025 Form 10-K

Use consistent capacity definitions

Distinguish utility service capacity, total facility load, usable IT load and customer-contracted capacity. They are not interchangeable. Cooling and other support systems consume power, redundancy requirements may affect usable capacity, and actual designs must be assessed by qualified engineers. Do not treat a utility’s nominal megawatt figure as automatically billable IT capacity.

For underwriting, record the applicable measurement basis and the document supporting it. A utility study, service agreement, equipment order, completed installation and successful commissioning test represent different levels of evidence. Similarly, a signed lease may still have conditions before rent begins.

The register should identify the party responsible for each dependency and whether the owner controls it. A target date from a sales presentation should not silently become an unconditional loan repayment assumption.

Hypothetical capacity reconciliation

Assume a project has a documented 10 MW utility-service design. For this illustration, engineers identify 8 MW of usable IT capacity after the relevant support-system and design constraints. Customer contracts cover 6 MW, but only 4 MW has completed the stipulated acceptance process and commenced billing. The remaining 2 MW is scheduled to commence in month seven, subject to stated conditions.

The hypothetical recurring capacity charge is $150 per kW per month. Power reimbursements and all other revenue are excluded to keep the example focused. Because 1 MW equals 1,000 kW, 4 MW produces $600,000 per month and 6 MW produces $900,000. Applying the charge to the 10 MW utility figure would incorrectly produce $1.5 million per month.

Uncontracted capacity is a potential leasing opportunity, not current revenue. Contracted but uncommenced capacity belongs in a dated scenario with its remaining conditions visible.

Quantify a commencement delay

Assume the base case bills 4 MW for months one through six and 6 MW for months seven through twelve. Annual capacity revenue is $9 million. If the additional 2 MW starts in month ten instead, annual revenue is $8.1 million, a $900,000 reduction.

Assume direct avoidable costs on that delayed capacity equal 30% of its revenue, while fixed operating costs and debt payments continue. The three-month delay reduces cash contribution by $630,000. Add $120,000 of entered commissioning and contractor extension costs, and the additional funding need is $750,000 before any customer remedies, financing fees or other changes.

The 30% assumption is hypothetical and excludes utility pass-through accounting. In an actual model, reconcile utility purchases and customer reimbursements separately, including caps, timing and nonrecoverable amounts. Gross power reimbursement revenue should not be mistaken for equivalent cash available to service debt.

Test customer obligations independently of rent

A delayed commencement may have different consequences from a service interruption after acceptance. Read the actual agreement for conditions, deadlines, credits, termination rights and remedies with counsel. Do not assume that a delay simply moves revenue to a later month while leaving every other obligation unchanged.

The same discipline applies to redundancy and expansion. A projected second utility feed or additional cooling installation should have its own budget, schedule and evidence. Capacity that exists only after a future upgrade cannot support current revenue without an explicit conditional treatment.

Present a financeable sequence of evidence

Provide the debt adviser with a capacity reconciliation, customer schedule, infrastructure milestones, remaining cost and delay cash requirement. The actual lender must decide what evidence is sufficient for closing, future advances and income recognition. A model cannot certify technical readiness or guarantee utility delivery.

The investor’s decision is whether the capital structure can fund the path from contracted capacity to accepted, billable service. Showing that path in megawatts, dates and cash makes the financing request more credible and reveals the specific dependencies that could otherwise remain hidden behind a headline leased percentage.