Cheap electricity looks like an easy win.
A data center uses a lot of power. So a lower price per megawatt-hour can save millions of dollars each year.
But there is another number that can matter even more: the date when the site can connect to the grid.
Power price tells you what it costs to run. Grid time tells you when you can start.
A cheap site that opens years late may cost more than an expensive site that starts much sooner.
A Simple Two-Site Example
We will compare two possible locations for the same 100 MW IT data center.
| Item | Site A | Site B |
|---|---|---|
| Electricity price | $50/MWh | $75/MWh |
| Grid connection delay | 48 months | 18 months |
| Difference | Site A saves $25/MWh but opens 30 months later | |
Site A wins on power price. Site B wins on time.
The question is not: “Which price is lower?”
The better question is:
Is the power saving large enough to pay for the extra wait?
Step 1: Calculate Annual Power Cost
We use the same data center model from the earlier articles:
- 100 MW of IT capacity
- 85% average load factor
- PUE of 1.30
- 967,980 MWh of electricity per year
The annual power bill at Site A is:
967,980 MWh × $50/MWh = $48.4 million per year
At Site B:
967,980 MWh × $75/MWh = $72.6 million per year
Site A saves about $24.2 million per operating year.
If we stop here, Site A looks much better.
Step 2: Give the Wait a Dollar Value
A delay is not free.
During the wait, the company may still pay for land, staff, design work, financing, and equipment orders. More importantly, the data center is not yet serving customers.
We can group those effects into one simple input: value lost per month of delay.
This is not a universal number. A training campus, a cloud region, and a small enterprise site may have very different values.
For a first screening, suppose each month of delay is worth $2 million.
| Simple screening item | Site A | Site B |
|---|---|---|
| One year of electricity | $48.4M | $72.6M |
| Delay value | 48 × $2M = $96M | 18 × $2M = $36M |
| First-pass score | $144.4M | $108.6M |
In this simple test, Site B wins by about $35.8 million.
Its electricity is more expensive. But it starts 30 months earlier.
Step 3: Find the Break-Even Point
The answer changes when the monthly value of delay changes.
The two sites become equal when:
$24.2 million annual power saving ÷ 30 extra months = about $806,650 per month
This is the break-even value.
- Below about $0.81 million per month, Site A has the lower score.
- Above about $0.81 million per month, Site B has the lower score.
The graph makes the tradeoff easy to see.
Site A starts lower because electricity is cheaper. But its line rises faster because the delay is much longer.
Site B starts higher. After the break-even point, its earlier start becomes more valuable than Site A’s lower power price.
This Is a Screening Model, Not a Final Budget
The model is useful because it is clear. It is also incomplete.
The first-pass score adds one year of power cost to a simple value for delay. It does not replace a full financial model.
A real decision should also include:
- land and building cost
- grid-upgrade payments
- taxes and local incentives
- water and cooling limits
- fiber connections and network delay
- power contract length and price changes
- financing and the time value of money
- the chance that the promised connection date moves again
Those items may change the answer. But they do not remove the basic idea.
A low electricity price has value only after the site can receive power.
Why Grid Time Is Becoming a Site-Selection Issue
Grid access is no longer a small line in a site report. It can decide whether a project opens on time.
The International Energy Agency estimates that grid limits could delay around 20% of global data center capacity planned for construction by 2030.
The IEA has also reported connection waits of two to ten years in parts of Europe, with even longer average queues in some major data center hubs.
This does not mean every project will wait that long. It means the connection date must be checked as carefully as the power price.
Four Questions to Ask Before Choosing a Site
- Is the power price firm? A headline market price is not the same as a signed long-term contract.
- Is the connection date firm? Ask what studies, permits, substations, and transformers still remain.
- What is one month worth? Estimate lost service value, carrying cost, and business delay.
- Can the site grow? A fast 100 MW connection may not help if the campus later needs 500 MW.
These questions turn a simple price comparison into a better site decision.
Use Three Numbers, Not One
The cheapest site cannot be found from the electricity price alone.
Start with three numbers:
Power price + connection time + monthly value of delay
The first number tells you how much the data center costs to run. The second tells you when it can start. The third tells you how much the wait matters.
Once those numbers are visible, “cheap power” becomes a business question rather than a slogan.
The Number to Remember
In this example, the cheap site loses its advantage when each month of delay is worth more than about $806,650.
That number is not universal. The method is.
Compare the annual power saving with the extra months of waiting. Then find the break-even point.
Related Articles
- Why Power, Not Chips, May Limit the AI Data Center Boom
- How to Understand a 100 MW Data Center Power Model
- AI Data Center Power Cost Calculator in Python
- How Many 100 MW AI Data Centers Will the World Need by 2030?
- What Must Be Built to Power the AI Data Center Boom?
Sources and Method
- International Energy Agency, AI and Energy Security .
- International Energy Agency, Overcoming Energy Constraints Is Key to Delivering on Europe’s Data Centre Goals .
- The Contexta screening model: 100 MW IT capacity, 85% load factor, PUE 1.30, and 967,980 MWh of annual electricity use.
Published: July 2026 · The two-site example is illustrative. It is not a quote, forecast, or investment recommendation for a real project.