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Terrestrial Data Center Cost of Capital

What is the weighted average cost of capital (WACC) for terrestrial AI data center infrastructure?

What is the weighted average cost of capital (WACC) for terrestrial AI data center infrastructure?

Answer

Terrestrial data center WACC ranges from 5% (optimistic) to 10% (conservative), with a central estimate of 7%. Data center assets have the lowest cap rates of any commercial real estate class (4.4% implied, 2025 credaily-dc-cap-rates.1) and hyperscalers borrow at near-Treasury rates (Alphabet's 3-year bonds at 27 bps over Treasuries alphabet-bonds.1). The mature, deep financing market — with $121B in hyperscaler debt issued in 2025 alone fortune-tech-borrowing.1 — keeps the cost of capital well below that of novel infrastructure.

Analysis

WACC by Operator Type

Hyperscaler corporate financing (5–7.5% WACC). Large technology companies finance data center construction from corporate balance sheets and investment-grade bonds. Credit ratings are strong: Alphabet Aa2, Meta Aa3; Microsoft and Amazon also elite investment-grade fortune-tech-borrowing.2. Alphabet's cost of new debt is approximately 4.5–5.0% (3-year bonds at 27 bps over 4.2–4.7% Treasuries alphabet-bonds.1), with cost of equity at ~7.3% alphaspread-googl.1. Blended WACC for hyperscalers is approximately 5.5–7.5%. In 2025, the five major hyperscalers generated a combined $575B in operating cash flow wolfstreet-hyperscaler.1, providing substantial self-financing capacity.

Data center REITs (5.5–9% WACC). Equinix WACC is estimated at 5.9%, with cost of debt at 4.65% valueinvesting-eqix.1. Equinix issues green bonds at 3.25–3.625% in EUR markets equinix-green-bonds.1. Digital Realty WACC is estimated at ~7.0%, with cost of debt at ~4.85% alphaspread-dlr.1. The industry-average weighted interest rate on REIT debt was 4.1% (Q1 2024), with 89.6% fixed-rate and 6.4-year average maturity nareit-balance-sheets.1. Smaller or newer REITs face higher equity costs, pushing WACC toward 8–9%.

Project finance / infrastructure funds (8–12%). Stabilized data center cap rates range from 4.25–6.25%, with five-year unleveraged IRRs of 7.0–8.5% rclco-dc-investment.1. Ground-up hyperscale development projects target 25–40% gross IRRs over 3–4 year hold periods accordant-dc-irr.1, but these high developer returns reflect construction and lease-up risk, not the stabilized asset's cost of capital. Stabilized data centers trade at 4.4% implied cap rates — the lowest across all commercial real estate credaily-dc-cap-rates.1. Even project finance for stabilized assets rarely exceeds 9%.

Market-Weighted Blend

Hyperscalers are increasingly dominant in new construction (~$600B in projected 2026 capex collectively introl-hyperscaler-capex.1), pulling the market-weighted WACC toward the hyperscaler range. However, significant capacity is still built by REITs and third-party developers. A market-weighted blend is approximately 6–8%, with a central estimate of 7%.

Upward Pressures

Unprecedented debt issuance volumes ($121B in 2025, $90B+ in the last three months alone mellon-ai-debt.1) are widening credit spreads. CDS costs for hyperscalers have risen since June 2025 mellon-ai-debt.1. S&P projects Amazon, Alphabet, and Meta will each end 2026 with more debt than cash, reversing their historically net-cash positions information-bigtech-debt.1. If the $1.5T in projected total tech sector debt materializes mellon-ai-debt.2, spreads could widen further, pushing WACC toward 8–9%.

Scenario Assumptions

Optimistic (5%). Hyperscaler self-financed at corporate WACC. Represents Google/Microsoft building owned facilities with Aa2+/AAA-rated debt at 4.5–5.0% and 7–8% equity cost.

Central (7%). Market-weighted blend of hyperscaler self-build (5–7.5%), REIT development (5.5–8%), and third-party project finance (8–10%). Anchored by Equinix at 5.9% and Digital Realty at ~7.0%.

Conservative (10%). Smaller operators, emerging markets, or a scenario where massive hyperscaler borrowing materially widens spreads. Represents the high end of mainstream data center financing — even at 10%, data center assets remain competitively financed relative to most infrastructure classes.

Evidence

  1. Equinix WACC estimated at 5.9%, with cost of debt at 4.65%. — valueinvesting-eqix
  1. Digital Realty WACC estimated at 7.0%. Cost of debt 4.85%, cost of equity 7.34%, debt weight ~23% of capital structure. — alphaspread-dlr
  1. Alphabet WACC estimated at 7.2%. Cost of equity ~7.25%, cost of debt ~6.6%. — alphaspread-googl

  1. Alphabet's 3-year bonds placed at 27 bps over Treasuries; 40-year bonds at 95 bps over Treasuries. Also issued a 100-year bond in sterling markets. Long-term debt rose to $46.5B by end 2025, more than 4x the prior year. — alphabet-bonds

  2. In 2025, the five major hyperscalers issued approximately $121B in new debt. Bond yields near 5%. Combined on-balance-sheet debt reached ~$420B by end 2025. — fortune-tech-borrowing

  3. Credit ratings: Alphabet Aa2, Meta Aa3, Oracle Baa2 (explicitly stated; Microsoft and Amazon described as elite investment-grade but specific ratings not listed). Total data center investment could run $1.5T–$3T over the next 3–5 years, per unnamed analyses. — fortune-tech-borrowing

6b. Morgan Stanley and JP Morgan project the tech sector may need $1.5T in new debt over the next few years for AI infrastructure. — mellon-ai-debt

  1. Equinix issued EUR 650M at 3.25% due 2031 and EUR 500M at 3.625% due 2034 (November 2024). Also $750M at 5.500% due 2034 (swapped to ~3.9% effective EUR rate). — equinix-green-bonds

  1. Data centers posted an implied cap rate of 4.4% in 2025, the lowest across all commercial real estate asset classes. — credaily-dc-cap-rates

  2. Stabilized data center cap rates 4.25–6.25%, five-year unleveraged IRRs 7.0–8.5%. Development leveraged IRRs 12–19%. Capex ~25% of NOI (vs 15% all real estate). — rclco-dc-investment

  3. Weighted average interest rate on total REIT debt was 4.1% (Q1 2024). 89.6% fixed-rate, 6.4-year average maturity. Debt-to-market assets 33.8%. — nareit-balance-sheets

  4. 2025 operating cash flow: Alphabet $165B, Amazon $139B, Microsoft $136B, Meta $115B, Oracle $20B (combined $575B). — wolfstreet-hyperscaler

  5. Big Five projected to spend ~$602B on infrastructure in 2026 (36% YoY increase). Raised $108B in debt during 2025 (3.4x historical $32B/year average). Capital intensity: Amazon 57%, Meta 52%, Microsoft 48%, Google 45% of revenue. — introl-hyperscaler-capex

  1. UBS anticipates ~$900B in new debt from global companies in 2026 (not tech-sector-specific). CDS costs for hyperscalers rising since June 2025, reflecting heightened credit risk from massive capex plans. — mellon-ai-debt

  2. S&P estimates Amazon, Alphabet, and Meta will each end 2026 with more debt than cash. Each could borrow ~$200B while retaining credit rating. — information-bigtech-debt

  3. Ground-up hyperscale projects target 25–40% gross IRRs over 3–4 year holds (July 2025). Development margins 50–65% in tier-one US markets. 10–15 year NNN leases with credit tenants. — accordant-dc-irr

  4. $5.2T total data center investment needed for 125 GW by 2030. This scale of investment is financed through established capital markets. — mckinsey-cost-of-compute