Google: Turning to Virtual Power Plants for Data Centres

Is it possible to unlock additional power capacity without adding a single new transmission line?

That is the question underpinning Google's latest energy partnership.

Through a new agreement with Voltus, the company hopes to tap existing flexibility across the PJM Interconnection grid, unlocking around 100MW of capacity that could support future data centre expansion.

The three-year agreement focuses on the PJM network, the largest electricity grid in the US, serving around 67 million people across 13 states.

As data centre operators face long waits for grid connections, the partnership offers a glimpse of an alternative route to securing power.

Instead of relying on new generation assets or costly infrastructure upgrades, Google will use Voltus' ‘Bring Your Own Capacity' (BYOC) model to access existing flexibility already embedded within local communities.

The arrangement is expected to unlock approximately 100MW of additional capacity that could help support Google's expanding data centre operations.

Unlocking hidden grid capacity

As hyperscale data centre demand climbs, power availability has become one of the industry's biggest constraints.

In markets like PJM, operators are encountering bottlenecks caused by rising electrification, ageing infrastructure and lengthy interconnection queues.

The Voltus model seeks to address those challenges by aggregating distributed energy resources into what is known as a virtual power plant (VPP).

These networks combine thousands of small-scale assets, including residential battery systems, smart thermostats and controllable electrical loads, into a coordinated resource capable of responding to fluctuations in grid demand.

Connected through IoT technologies and managed through software platforms, VPPs can reduce demand or release stored energy during peak periods, creating additional capacity across the wider electricity system.

Google's data centres can then draw on that freed-up capacity without waiting for major grid expansion projects to be completed.

A first for hyperscale operators

The agreement marks the first time a hyperscale company has adopted Voltus' BYOC offering.

Dana Guernsey, CEO of Voltus, says the partnership could provide a blueprint for other large-scale electricity users.

"This initial phase of our Google partnership is pioneering a model that large load customers can follow, and we expect it to accelerate the role of distributed energy resources as a capacity solution at scale."

The commercial structure differs from traditional approaches to meeting demand growth.

Instead of funding large infrastructure projects designed to accommodate occasional peaks in electricity use, Google will fund the aggregation of existing resources while Voltus coordinates participating homes and businesses.

Those participants receive payments for providing flexibility to the grid, creating an additional revenue stream for communities while increasing available capacity.

Data centres drive new energy strategies

The search for ways to secure power more quickly never stops for data centre operators.

Google is not alone in confronting these pressures. Fellow hyperscalers including Microsoft, Amazon and Meta are all navigating rising electricity costs, shrinking reserve margins and growing scrutiny over the impact of data centre demand on local grids.

The agreement builds on previous efforts to extract greater value from existing electricity systems.

The company says its independent utility agreements have already unlocked around 1GW of demand response capacity across US power networks.

The Voltus partnership extends that strategy beyond Google's own facilities, drawing on energy resources located within surrounding communities.

Beyond the data centre fence

The potential benefits extend beyond hyperscale operators.

According to analysis from The Brattle Group, wider adoption of virtual power plants could save US consumers more than US$100bn over the next decade by making better use of existing grid resources.

Kate Brandt, Chief Sustainability Officer at Google, believes the model could benefit both communities and the wider energy system.

"This is a transformative model because it creates new, clean capacity for the system and channels investment directly into local communities by paying participating homes and businesses for their energy flexibility."

At 100MW, the initial programme represents only a small fraction of the power required by modern hyperscale campuses.

However, the project offers an early indication of how hyperscalers may seek to secure additional capacity as power availability becomes a critical factor in data centre development.