Powered Shell Data Center: What It Is and What It Returns
A powered shell data center is a building delivered with electrical service, cooling plant, structural capacity and connectivity in place, where the tenant funds the interior fit out. The landlord provides the envelope and the power. The operator or end user provides everything inside the white space.
It is one of three ways a site owner can monetize data center capacity, and for developers it is often the one that fits what they already do.
That split moves 60 to 70 percent of total fit out cost off the developer’s balance sheet. It produces the lowest revenue per kilowatt of the three structures available to a site owner and the highest return on capital deployed, and it is the only one that can be leased before the building is finished. Whether it suits a specific site comes down to four things fixed at design: contracted power with an energization date, floor loading in pounds per square foot, whether the cooling loop reaches the white space, and physical route diversity on the fiber.
Metro Colo Advisory advises developers and investors on which structure a specific site should be built for. This page covers what a powered shell is, what it returns, and the specification decisions that determine whether anyone will lease it. If you hold a site with power and have not settled that question, our data center consulting practice exists for exactly that. Engagements are project-based and fixed-fee, typically from $40,000 to $195,000 depending on scope.
What a Powered Shell Includes
There is no universal standard, which is the first thing to understand. Powered shell means different things in different deals, and the line between landlord scope and tenant scope is negotiated rather than assumed.
What is typically landlord scope:
The building envelope, slab, structure and roof. Electrical service from the utility to a demarcation point inside the building, including transformers, switchgear and primary distribution. The mechanical plant, meaning chillers, pumps and the cooling loop stubbed to the white space boundary. Generator pads and yard space. The meet-me room. Site security perimeter, fencing and access roads.
What is typically tenant scope:
Everything inside the white space. Racks, cabinets and containment.
Power distribution units. Uninterruptible power supply and battery plant. Coolant distribution units and in-row or rear-door cooling equipment. In-room fire suppression. Network equipment. Their own access control and monitoring.
That split typically moves 60 to 70 percent of total fit out cost from the landlord to the tenant, which is why powered shell requires so much less capital than a turnkey delivery.
Where the line falls is a commercial decision, not a technical one. Including more electrical and mechanical work raises the rate you can charge and the capital you commit.
Getting that boundary right for a specific site and a specific tenant profile is part of what a consulting engagement settles.
Powered Shell vs Turnkey vs Retail Colocation
The three structures differ far more in what they demand of the owner than in what they pay.
| Powered Shell | Wholesale Turnkey | Retail Colocation | |
|---|---|---|---|
| What is delivered | Building, power, cooling plant, connectivity | Fitted white space ready for equipment | Cabinets, cages and services |
| Who funds the fit out | Tenant | Landlord | Landlord |
| Capital per megawatt | Lowest | High | Highest |
| Revenue per kilowatt | Lowest | Middle | Highest |
| Operating burden | Minimal | Low | Continuous |
| Typical term | 10 to 20 years | 5 to 15 years | 1 to 5 years |
| What the owner becomes | A landlord | A specialized landlord | An operator |
The important point is what that table does not show. Data center leases price per kilowatt rather than per square foot, so a building leasing a given amount of power earns broadly comparable revenue across the structures. What changes is who pays for the fit out, what it costs to serve the tenant, and what the asset is worth at sale.
Working out which of the three a specific site should be built for is where our engagements usually start, and a build to suit is the third path, because the layout, cooling architecture and electrical design all follow from that decision. We model capital required, revenue, operating burden and exit value across all three paths against a defined budget, so the choice is made on numbers rather than instinct.
Not sure which structure fits your site?
Powered Land and Powered Shell Are Not the Same Thing
Powered land is a site with utility capacity secured but no building. Powered shell is a building already constructed with that capacity brought into it.
The distinction matters commercially. Powered land trades on the strength of the interconnection, the acreage and the entitlement position. A powered land data center transaction is a land deal with a utility agreement attached. Powered shell trades on all of that plus the structure, the mechanical plant and a delivery date.
Powered land is the earlier stage and the cheaper entry. Powered shell is closer to revenue and commands a higher price, because the buyer is not carrying construction risk on the building.
What Makes a Data Center Shell Leasable
Four things determine whether an operator or end user will take a shell, and three of them are fixed at design.
Contracted power, with an energization date
The single most important number, and the one most often overstated. Energized capacity, capacity contracted with a date, and capacity a utility has indicated is available are three different things. Tenants underwrite the first two. So do appraisers and lenders.
Floor loading
Measured as design live load in pounds per square foot, and found in the structural general notes rather than the architectural drawings. ANSI/TIA-942 sets 150 psf as a minimum and 250 psf as the recommended figure for a data hall. Rack-scale AI deployments weigh roughly 1.5 tons per rack, and Intel recommends 350 psf for high density data centers. Standard industrial slabs are often specified at 125 to 250, which is why this number decides whether the highest density tenants are available at all.
Cooling architecture
Whether facility water reaches the white space, or only the plant room. Redundancy configuration matters here too, and tenants will specify it against a tier standard. Air cooling has a hard ceiling near 30 to 35 kilowatts per rack no matter how well a hall is engineered. Above that, liquid cooling stops being optional, and retrofitting a loop into a finished building costs several times what stubbing it in at construction would have.
Connectivity
Carrier count matters less than physical route diversity. Two providers sharing one pole line is one path with two logos on it. Tenants with uptime commitments ask for route maps, not carrier lists.
Establishing all four for a specific building is the first phase of a data center consulting engagement. The output is a density ceiling by zone rather than a single figure, because portions of a floor often support more than the rest, and that ceiling determines which operators are worth approaching at all.
The same physical route logic applies when a tenant is choosing between markets rather than buildings.
How the Arithmetic Actually Works
The following is illustrative, using round numbers rather than any specific site, but it is the calculation that governs every decision on this page.
Take a building with 10 megawatts of utility service. After the electrical and cooling overhead a facility carries, roughly 7 megawatts reaches the equipment. That 7 megawatts supports approximately:
- 700 cabinets at 10 kilowatts each, which is conventional enterprise colocation.
- 230 cabinets at 30 kilowatts, which is high density enterprise and some AI inference.
- 45 to 50 racks at 140 to 160 kilowatts, which is rack-scale AI infrastructure.
Three completely different buildings from one electrical service. The revenue is broadly comparable across all three, because data center leases price per kilowatt rather than per square foot.
What differs is the floor area required, the cooling architecture, the structural loading, and which tenants are available at all.
Now run it the other way. A developer who lays out 1,500 cabinets across the floor and then checks the power has designed for roughly 4.7 kilowatts a cabinet. That is 2010 enterprise density in a market where the average reached 27 kilowatts in 2026. The hall is sized for a tenant that no longer exists.
That error is common, and it happens because the layout gets drawn from how many cabinets the floor will hold rather than from what the power service will support. It is also expensive to correct after the slab is poured, and cheap to correct on a drawing.
Building toward the wrong density is not a rounding error. On a project of this scale it is a mistake measured in millions, and it is decided months before anyone notices.
The Economics of a Powered Shell
Powered shell produces the lowest revenue per kilowatt of the three structures and the highest return on capital deployed, because the capital required is a fraction of a turnkey delivery.
Published benchmarks put turnkey data center construction at roughly 8 to 12 million dollars per megawatt, and 15 to 20 million or more per megawatt for AI-optimized facilities designed for rack-scale density. Electrical infrastructure alone accounts for 40 to 45 percent of that. In a powered shell, most of the electrical spend above the demarcation point sits with the tenant.
For scale, Digital Realty guided to an 11.5 percent average expected stabilized yield on its development pipeline in mid-2026. That is a useful reference for what institutional capital targets on data center development, at institutional cost of capital and market land basis. A developer already holding the land and already building the structure carries a lower incremental basis, which is where the case for powered shell usually comes from.
The other advantage is timing. A powered shell can be leased before completion, because the tenant is buying a building rather than a service. A retail facility has to be finished first and then filled one cabinet at a time, which can take three to five years.
Yield on cost is the figure most developers want and the hardest to source, because achievable rent per kilowatt in a specific submarket is not published anywhere. We model it in ranges with the assumptions stated and sensitivity shown on rate and lease-up timing, which is how developers evaluate any other asset class.
When Powered Shell Is the Right Structure
It fits when the owner is a developer rather than an operator. Retail colocation is not a different investment, it is a different business, carrying a sales function, remote hands, security staffing and churn. Powered shell keeps the owner doing what they already do.
It fits when capital is the constraint. A budget that would fit out two megawatts turnkey will deliver a shell several times that size, and stranding electrical capacity you have already contracted is expensive.
It fits when speed to a signed tenant matters. Pre-leased assets trade at materially different capitalization rates than speculative shells, and powered shell is the only one of the three that can be committed before the building is finished.
It fits less well when the site is small enough that a single operator would not be interested, when the power position is uncontracted, or when the owner wants to be in the colocation business.
What Gets Locked at Design
Three decisions cannot be reversed economically once construction proceeds.
Floor loading, which determines the density ceiling and therefore the tenant list. Slab to slab clear height, which governs whether overhead distribution and containment fit. And whether the cooling loop is stubbed to the white space or stops at the plant room.
Everything else, including the interior layout, the electrical distribution inside the hall and the cooling equipment itself, remains a fit out decision. Which is precisely why a powered shell strategy is decided before the shell goes up rather than after.
The cost of changing a layout and a cooling approach on a drawing is a fraction of changing it once the slab is poured, and a very small fraction of the difference between a leased asset and a speculative one.
Still pre-construction? That is the moment this analysis is worth most.
Common Mistakes
Designing from cabinet count rather than from power.
The most frequent error we see. A floor plan is drawn to fit as many cabinets as the space allows, then the electrical service is checked against it. In a data center the power service sets the ceiling, and the layout follows from the density the building is intended to serve.
Treating a utility indication as contracted capacity.
An assurance that megawatts are available is worth substantially less in a lease negotiation than an executed agreement with an energization date.
Assuming carrier presence equals route diversity.
Two providers on the same physical path is a single point of failure regardless of how it reads on a marketing sheet.
Finishing too much.
Completing white space that a tenant will want configured their own way is capital spent twice.
Each of these is cheap to correct at design and expensive to correct afterwards. They are also the kind of thing a real estate advisor and an engineering firm can both miss, because neither is asked who will lease the building.
Frequently Asked Questions
What is a powered shell data center?
A building delivered with electrical service, cooling plant, structural capacity and connectivity in place, where the tenant funds the interior fit out. The landlord provides the envelope and the power; the tenant provides the racks, distribution, cooling equipment inside the hall and everything else in the white space.
What is the difference between powered shell and turnkey?
Turnkey delivers fitted white space ready for equipment, with the landlord funding the fit out and charging a higher rate per kilowatt. Powered shell delivers the building and the power, with the tenant funding the fit out at a lower rate. Turnkey requires roughly three to five times the capital per megawatt.
What is powered land?
A site with utility capacity secured but no building constructed. It is the stage before a powered shell exists, and it trades on the interconnection, acreage and entitlement position rather than on any structure.
How much does a powered shell cost to build?
Materially less per megawatt than turnkey, which published benchmarks put at 8 to 12 million dollars per megawatt for standard facilities and 15 to 20 million or more for AI-optimized builds. The exact figure depends on how much electrical and mechanical work sits above the demarcation point, which is negotiated deal by deal.
What floor loading does a powered shell need?
ANSI/TIA-942 sets 150 pounds per square foot as a minimum and 250 as the recommended figure. Intel recommends 350 for high density data centers. The number appears in the structural general notes, not the architectural drawings, and it is the single specification most often missing when a developer first approaches the question.
Can a powered shell be leased before it is finished?
Yes, and that is one of its main advantages. Because the tenant is buying a building rather than a service, a lease can be signed off drawings and rent can commence at delivery, rather than after a multi-year lease-up.
Who leases powered shells?
Colocation operators expanding into a market without wanting to develop, enterprises with large single-tenant requirements, and increasingly AI infrastructure companies that want control of the fit out to match their own hardware.
What This Page Cannot Tell You
Everything above is general. Four things are specific to a site, and none of them can be answered from a page.
- What your building can actually serve. That comes from the structural general notes, the electrical single line diagram and the mechanical drawings. Floor loading in particular is almost never on the architectural set, and it is the number that decides whether the highest density tenants are available to you at all.
- Which operators would consider it. That requires knowing their current footprint gaps, their expansion patterns, whether they lease shell or develop their own, and what they are actively looking for. Published market reports do not contain it.
- What rent per kilowatt is achievable in your submarket. Colocation rates are negotiated privately and are not published for any market outside the largest few. Secondary market pricing in particular has to be established from operator conversations rather than from a report.
- What any of it returns. Yield on cost depends on your basis in the land, what you have already committed to the structure, your capital position and your required return. Two identical buildings produce very different numbers depending on how the owner got there.
Those four are what a consulting engagement produces, and they are the reason a page like this can only take the question so far.
Working Out Which Structure Fits a Site
Metro Colo Advisory advises developers and investors on exactly this question. A full engagement covers six things.
- Building envelope. What the site can serve and at what density, given power, floor loading, cooling architecture, clear height and area for mechanical plant.
- Operator fit. Which operators match the site and the market, with the reasoning stated for each.
- Market context. Competitive supply in the region, and what tenants at each density tier actually require.
- Yield on cost. Capital, revenue, operating burden and exit value across all three structures, modeled against a defined budget.
- Connectivity. Carrier position, physical route diversity, and the options for improving it.
- Specification and recommendation. Which path the analysis supports, what the building needs to be to capture it, and the sequence against your construction timeline.
Engagements typically run from $40,000 to $195,000 depending on scope, with monthly retainers available for ongoing work.
We are independent. We design nothing and operate nothing, and our consulting engagements are paid by the client rather than by any provider. Separately, we place enterprise and infrastructure requirements into colocation facilities nationally, which is how we know what tenants at each density tier actually ask for rather than what they say in a survey.
If you hold a site with power and have not yet decided what to build, that is the conversation worth having before the shell goes up.
