A greenfield data center costs $17.6M per MW for the most modern facilities (Cushman & Wakefield, 2026 Data Center Development Cost Guide, Aug 2026). A brownfield conversion of an existing facility to AI-ready, liquid-cooled colocation runs about $12M per MW and takes 12–18 months instead of 36 or more (StackedAI analysis, Tier-2 brownfield conversion underwriting framework, Aug 2026). The larger gap is time, not dollars.
What does a greenfield data center cost per MW in 2026?
The published benchmarks differ on scope, not accuracy. Cushman & Wakefield puts the most modern facilities at $17.6M per MW, up 21% per MW on the prior guide (Cushman & Wakefield, 2026 Data Center Development Cost Guide, Aug 2026). JLL’s construction benchmark is $11.3M per MW for 2026, up from $10.7M in 2025, with AI fit-out taking the total to as much as $25M per MW (JLL, 2026 Global Data Center Outlook, Jan 2026). Turner & Townsend shows Silicon Valley at $13.3 per watt and New Jersey at $12.9 per watt, with 5.5% cost inflation and a 7–10% premium for AI-specification builds (Turner & Townsend, Data Centre Cost Index 2025, Nov 2025).
Scope explains the spread: shell-and-plant, modern high-density build, or fully fitted AI hall. Two more figures matter. Only 50–60% of scheduled capacity comes online on time (Goldman Sachs Research, May 2026), and 95% of the 66 GW under construction in North America is already pre-committed (JLL, North America Data Center Report Midyear 2026, Aug 2026). Greenfield cost per MW understates greenfield cost per MW delivered on schedule.
What does a brownfield data center conversion cost per MW?
- AI-ready, liquid-cooled conversion of a legacy data center: about $12M per MW of critical IT load, against a Tier-3 baseline of $7–9M per MW before AI fit-out (StackedAI analysis, Tier-2 brownfield conversion underwriting framework, Aug 2026).
- Miner-site conversion to AI compute: $8–10M per MW of critical IT load for a Texas site (TeraWulf press release, Oct 2025).
- Liquid-cooling component only: $2–3M per MW for a broader direct-to-chip retrofit (StackedAI analysis, Cooling Solutions retrofit note, Aug 2026), or a $1.5–1.6M per MW premium, 20–25% above air-cooled (Data Center Knowledge, Apr 2026).
- Powered shell $3–5M per MW and turnkey wholesale $10–13M per MW (StackedAI analysis, transaction-structures framework, Aug 2026); a legacy data center is a powered shell with partially reusable plant.
The saving against greenfield is the shell, site work, and interconnect; the mechanical and electrical plant costs about the same on either path. Cooling options are priced in liquid cooling retrofit cost for a legacy data center.
How do timelines, power position, and risk compare?
| Factor | Greenfield | Brownfield conversion | Sources |
|---|---|---|---|
| Cost per MW (critical IT) | $17.6M most modern; $11.3M construction benchmark; up to $25M with AI fit-out | ~$12M AI-ready; $8–10M miner-site; $7–9M Tier-3 baseline | C&W, Aug 2026; JLL, Jan 2026; StackedAI, Aug 2026; TeraWulf, Oct 2025 |
| Timeline to first tenant | 36+ months | 12–18 months | StackedAI analysis, Aug 2026 |
| Power position | New large-load request: 4.4 years average; primary-market grid wait more than 4 years | Existing service agreement and installed transformers; upgrade only above service capacity | Cushman & Wakefield, May 2026; JLL, Jan 2026 |
| Transformer exposure | Full: 120 weeks average, 80–210 weeks for large units | Partial: incremental capacity only | Wood Mackenzie, Apr 2024 |
| Delivery risk | Only 50–60% of scheduled capacity on time | Retrofit scope: structural, water, hidden plant condition | Goldman Sachs, May 2026; StackedAI, Aug 2026 |
| Scale | Campus, 100 MW to 1 GW | 7–25 MW per site | StackedAI analysis, Aug 2026 |
| Output pricing | NoVA $190–235/kW/month | Tier-2 pricing 15–30% below primary averages | CBRE, Jun 2026; StackedAI analysis, Aug 2026 |
Modeling cost per MW alone underprices brownfield. On dollars, the conversion saves roughly $5–6M per MW against the modern-facility figure; on time, it saves 18–24 months, and with vacancy at 1% for three consecutive years (JLL, North America Data Center Report Midyear 2026, Aug 2026) those months are revenue. The power diligence behind the timeline claim is in how private equity underwrites data center power risk.
When does greenfield beat brownfield?
- Scale. A sponsor needing 100 MW or more in one location cannot assemble it from 7–25 MW sites; hyperscale shells run 100 MW to 1 GW (StackedAI analysis, transaction-structures framework, Aug 2026).
- Structure. Raised-floor halls built for 5–15 kW per rack (StackedAI analysis, Cooling Solutions retrofit note, Aug 2026) may not carry 120 kW liquid-cooled racks without slab work. If the structural fix exceeds the shell saving, the case fails.
- Small interconnect. A 3 MW service agreement on a building meant to run at 15 MW is a new large-load request in disguise, with the same 4.4-year average wait (Cushman & Wakefield, 2026 Global Data Center Market Comparison, May 2026).
- Water. No chilled-water plant and no water rights means full mechanical cost plus permitting risk.
Outside those cases, brownfield at about $12M per MW and 12–18 months is the cheaper and faster route to energized AI capacity in the 7–25 MW range. The full thesis is in Tier-2 brownfield data center conversion; the lease structures that follow are compared in powered shell vs turnkey data center lease.
Key terms
- Cost per MW: total development or conversion capital divided by MW of critical IT load; quotes based on gross utility MW understate the true figure.
- Greenfield: construction on undeveloped or cleared land with no reusable structure, plant, or interconnect.
- Brownfield: redevelopment of an existing facility where structure, utility service, and some plant are reused.
- AI fit-out: the incremental mechanical and electrical scope for high-density, liquid-cooled racks, including CDUs, cold plates, manifolds, and high-amperage distribution.
- Powered shell: a building with structure, site work, and utility power but no mechanical and electrical fit-out.
How StackedAI applies this
StackedAI uses the figures above as screening benchmarks, not underwriting conclusions. Each candidate site is modeled on its own reusable plant, service agreement, floor loading, and water position, and the resulting cost per MW is compared with the greenfield alternative in the same market and the sponsor’s return floor. Where the reusable plant is thin, StackedAI prices the site as a powered shell. Andre van Zijl’s greenfield builds and acquired-facility integrations over more than 21 years inform the timeline assumptions.
Frequently asked questions
What does a greenfield data center cost per MW in 2026?
Cushman & Wakefield’s 2026 Development Cost Guide puts the most modern facilities at $17.6M per MW, up 21% on the prior guide. JLL’s 2026 Global Data Center Outlook uses a construction benchmark of $11.3M per MW, with AI fit-out pushing the total to as much as $25M per MW. The spread reflects scope.
What does a brownfield data center conversion cost per MW?
StackedAI benchmarks an AI-ready, liquid-cooled conversion of an existing facility at about $12M per MW of critical IT load, against a Tier-3 baseline of $7–9M per MW. TeraWulf disclosed $8–10M per MW for converting a Texas mining site. The liquid-cooling component alone is $2–3M per MW, or a $1.5–1.6M per MW premium over air-cooled.
Why is brownfield faster than greenfield?
Power, not the building, is the long pole. New large-load requests average 4.4 years to delivery (Cushman & Wakefield) and primary-market grid waits exceed four years (JLL). A brownfield site with an existing service agreement and installed transformers can be retrofitted in 12–18 months, against 36 or more months for greenfield (StackedAI analysis).
When does greenfield beat brownfield?
When the sponsor needs 100 MW or more on one campus, when the legacy structure cannot carry liquid-cooled rack weights, when the existing interconnect is small and the utility upgrade is no faster than a new request, or when there is no water. Then the brownfield discount is spent on structural and electrical work and the schedule advantage disappears.
What does a powered shell cost compared with turnkey?
StackedAI’s transaction-structures framework benchmarks a powered shell at $3–5M per MW and turnkey wholesale capacity at $10–13M per MW, with the shell typically 35–45% of turnkey capex or rate. Entitled powered land sits below both at roughly $150–200K per MW. StackedAI benchmarks these per engagement.
Sources
- Cushman & Wakefield, 2026 Data Center Development Cost Guide, Aug 2026, https://www.cushmanwakefield.com/en/united-states/insights/data-center-development-cost-guide
- Cushman & Wakefield, 2026 Global Data Center Market Comparison, May 2026, https://ir.cushmanwakefield.com/news/press-release-details/2026/Dallas-Texas-Ranked-No–1-Primary-Data-Market-in-the-World-as-AI-Demand-Power-Constraints-and-Regulation-Reshape-CRE-Strategy/default.aspx
- JLL, 2026 Global Data Center Outlook, Jan 2026, https://www.jll.com/en-us/insights/market-outlook/data-center-outlook
- JLL, North America Data Center Report Midyear 2026, Aug 2026, https://www.jll.com/en-us/newsroom/data-center-demand-exceeds-expectations-in-h1-2026
- CBRE, Global Data Center Trends 2026, Jun 2026, https://www.cbre.com/insights/reports/global-data-center-trends-2026
- Turner & Townsend, Data Centre Cost Index 2025, Nov 2025, https://www.turnerandtownsend.com/news/ai-data-centre-rush-raises-alarm-over-construction-supply-chain/
- TeraWulf, Expands Strategic Partnership with Fluidstack Through New 168 MW AI Compute Joint Venture (press release), Oct 2025, https://investors.terawulf.com/news-events/press-releases/detail/121/terawulf-expands-strategic-partnership-with-fluidstack-through-new-168-mw-ai-compute-joint-venture
- Data Center Knowledge, Neocloud Storm Gathers as Data Center Deals Stall Over Credit Risk, Apr 2026, https://www.datacenterknowledge.com/cloud/neocloud-storm-gathers-as-data-center-deals-stall-over-credit-risk
- Goldman Sachs Research, US Data Center Power Demand Projected to Double by 2027, May 2026, https://www.goldmansachs.com/insights/articles/us-data-center-power-demand-projected-to-double-by-2027
- Wood Mackenzie, Supply Shortages and an Inflexible Market Give Rise to High Power Transformer Lead Times, Apr 2024, https://www.woodmac.com/news/opinion/supply-shortages-and-an-inflexible-market-give-rise-to-high-power-transformer-lead-times/
- StackedAI analysis, Tier-2 brownfield conversion underwriting framework, Aug 2026
- StackedAI analysis, transaction-structures framework, Aug 2026
- StackedAI analysis, Cooling Solutions retrofit note, Aug 2026