What Is a 1 GW Data Center?

Understanding the scale, infrastructure, and implications of gigawatt-class computing campuses.

One gigawatt. It's a number that was almost never uttered in the same sentence as "data center" five years ago. Today, 1 GW data centers — or at least 1 GW campuses — are not only being discussed but actively planned, permitted, and interconnected.

A 1 GW (gigawatt) data center consumes 1,000 megawatts of electricity at full build-out. To put that in perspective, a single gigawatt is enough to power approximately 200,000 average US homes — or more than 500,000 homes running air conditioning during peak summer hours. A 1 GW data center campus is an industrial electricity consumer on par with a mid-sized city, a large steel mill, or a major oil refinery.

The Scale of 1 GW

Let's make this concrete. Here is what 1 GW means in relatable terms:

• Homes: 200,000–500,000 homes, depending on region and AC penetration. That's a city the size of Newark, New Jersey, or almost all of Salt Lake City, Utah.
• Power plants: Equivalent to one large nuclear reactor (1 GW is roughly the capacity of a single unit at a nuclear plant like Vogtle or Palo Verde), or about 250–330 large wind turbines (3 MW each).
• Solar farms: Approximately 3,000–4,000 acres of utility-scale solar panels, or about 5 square miles.
• NFL stadiums: Equivalent to approximately 20 NFL stadiums running at full power during a game.
• Land area: A 1 GW data center campus typically requires 300–500+ acres of land for buildings, substations, cooling infrastructure, and backup generators.

The Emergence of Gigawatt Campuses

Until 2023, no data center developer seriously contemplated building a 1 GW campus. The largest facilities were hyperscale campuses in the 100–200 MW range. Three factors changed this:

1. AI Training at Scale

Large language models and generative AI require GPU clusters that draw 10x the power of traditional CPU-based workloads. A single training run for a frontier model like GPT-5 or Gemini consumes 50–100 GWh. Companies are now planning clusters of 100,000 to 500,000 GPUs, each requiring 50–100+ MW per cluster.

2. Cloud Computing Growth

Global cloud revenue exceeded $800 billion in 2025 and continues growing at over 20% annually. Every percentage point of cloud adoption translates into gigawatts of new data center capacity over a multi-year build cycle.

3. Concentrated Load in Grid-Constrained Regions

Northern Virginia — the world's largest data center market — is already approaching 5 GW of total data center load. The next wave of development is pushing individual campuses to the 1 GW mark to concentrate compute in the same low-latency regions.

Real 1 GW Projects

Several projects in our tracking database approach or exceed the 1 GW mark:

Infrastructure Requirements for 1 GW

Building a 1 GW data center campus requires infrastructure that goes well beyond what most utility systems are designed to handle:

• Transmission service: Typically requires 230 kV or 345 kV transmission lines with multiple feeds for redundancy. This is transmission-level service, not distribution.
• On-site substations: A 1 GW campus needs at least one dedicated substation, often two. These substations can cost $50–200 million each and require 3–5+ years to plan, permit, and construct.
• Transformers: Large power transformers (rated 100–500 MVA) are needed for each substation. With current lead times of 2+ years for these transformers (read about the transformer shortage), procurement must begin years before energization.
• Backup generation: Tens to hundreds of megawatts of diesel or natural gas backup generators. A 1 GW campus might have 500+ MW of backup generation capacity dispersed across multiple buildings.
• Cooling: 1 GW of IT load generates approximately 1 GW of waste heat. Liquid cooling, chilled water systems, and cooling towers at immense scale are required.

Grid Implications of 1 GW Campuses

The emergence of gigawatt-scale data centers has profound implications for grid planners. A single 1 GW load represents a risk concentration that most utilities have never managed. If that campus loses utility feed, the backup generators must sustain operations. If the campus curtails, the grid must absorb or redirect the load imbalance.

This is why utility interconnection queues — the process for connecting new loads to the grid — have ballooned to over 2,000 GW of pending capacity across US RTOs and ISOs. (Learn more about interconnection queues.) The queue doesn't just represent generation; it increasingly represents data center load interconnection requests.

Is 1 GW the New Normal?

It appears so. Multiple hyperscalers and AI companies have outlined plans that imply 1 GW+ campuses will become common by 2028–2030. Microsoft, Google, and Amazon have each announced AI infrastructure investments exceeding $50–100 billion that will require gigawatt-scale facilities. The question is no longer whether 1 GW data centers will exist, but how many will be built and where.

Key Takeaways

• 1 GW = 1,000 MW = power for 200,000–500,000 homes
• Gigawatt-scale campuses are actively being planned and permitted
• Transmission, transformers, and substations are the critical bottlenecks
• Grid interconnection queues must adapt to handle 1 GW+ load requests
• AI training clusters are the primary driver of gigawatt demand growth