PVTIME – Voltus, a San Francisco-based operator of virtual power plants and distributed energy resource platforms, has closed a $225 million Series D funding round. Generation Investment Management led the round, with Activate Capital and Vitol participating as co-leaders. Other investors include Broadscale Group, Climate Investment, NGP, Ajax Strategies and All Aboard Fund.
The capital will be used to expand Voltus’ virtual power plant services across the United States and Canada, scaling up a platform that currently connects over 7.5GW of distributed energy resources to all nine North American wholesale electricity markets.
Voltus aggregates behind-the-meter assets, including commercial and industrial batteries, smart thermostats, electric vehicle chargers, and controllable loads, and dispatches them as virtual capacity in wholesale markets and utility procurement programmes. This model enables utilities, grid operators and large commercial consumers to access flexible capacity without constructing new generation assets.
One of its most notable deployments is a three-year agreement with Google, through which Voltus aggregates up to 100MW of distributed resources across the PJM Interconnection grid, the largest wholesale electricity market in the US, serving 13 states and the District of Columbia. Structured as a Bring Your Own Capacity (BYOC) contract, the agreement was the first of its kind to be signed by a hyperscale cloud provider, and it is designed to relieve grid congestion caused by the rapid growth in demand for data centres.
Voltus also collaborates with Octopus Energy to integrate residential devices, such as smart thermostats, EVs and home batteries, into its VPP portfolios across the PJM, MISO, New York and California grids. Separately, Voltus launched its BYOC programme with Cloverleaf Infrastructure in October 2025, targeting data centre developers seeking alternative pathways to grid interconnection.
The funding comes at a time of heightened scrutiny of electricity grid capacity across the US. PJM’s recent capacity auction cleared at US$326.79 per megawatt-day, a record high that highlights the increasing financial incentive for demand-side resources. An independent analysis by the Brattle Group estimates that leveraging existing grid flexibility through VPPs could save US consumers over US$100 billion compared with building new peaking plants over the next decade.
