Plainfield Thermal Battery

Executive Overview

The Plainfield Thermal Battery is an industrial heat decarbonisation project at Diageo Americas Supply's distillery facility in Plainfield, Illinois, part of a two-site programme also including Diageo's Shelbyville, Kentucky facility, selected under the U.S. Department of Energy's Industrial Demonstrations Program with a federal cost share of up to $75 million. The project, developed in partnership with Rondo Energy and the National Renewable Energy Laboratory, will replace natural gas-fired process heat with electric heat batteries charged by onsite renewables. It is expected to reduce Diageo's combined annual CO₂ emissions from the two facilities by nearly 14,000 metric tonnes per year. No facility capacity, commercial operation date, or detailed project timeline has been publicly disclosed.

How It Works & Differentiation

Rondo's heat battery uses surplus or low-cost renewable electricity to heat refractory bricks to high temperatures, storing energy that is then dispatched as industrial steam or hot gas to replace combustion-based boilers. The system is designed as a low-cost, drop-in replacement for existing boiler and co-generation infrastructure, with charging scheduled to coincide with the lowest-cost hours of electricity each day. At Heineken's brewery near Lisbon — a comparable Rondo deployment announced in parallel — a 100 MWh Rondo heat battery will be charged by a 7 MW onsite solar array and supplied under a heat-as-a-service agreement by EDP, providing a directly analogous commercial template for the Diageo project. No proprietary technical specifications for the Plainfield system have been disclosed.

Commercialization & Traction

The DOE IDP award — covering up to $75 million in federal cost share across both Diageo facilities — provides the primary commercial anchor for the project and validates Rondo's technology within the federal industrial decarbonisation programme. Rondo closed a $60 million funding round in 2023 and operates a 100 MWh commercial heat battery in California. Diageo has publicly committed to achieving net zero across its global operations by 2030, making the Plainfield project one component of a broader capital programme. The project is in early development and has not yet reached construction.

Scalability & Strategic Context

The Diageo Plainfield project is one element of a broader wave of DOE-supported industrial heat electrification projects across the food, beverage, and glass sectors — including Kraft Heinz (up to $170.9 million, up to 11 facilities), Libbey Glass, Owens-Brockway, and Gallo Glass — that collectively represent a coordinated attempt to demonstrate replicable decarbonisation pathways for U.S. industry. Process heat accounts for approximately 20% of global energy consumption and roughly 13% of U.S. energy-related carbon emissions, with about 75% of U.S. thermal emissions from low- and medium-temperature processes where heat batteries are technically well-suited. Success at the Diageo facilities would provide one of the first commercial demonstrations of electric heat battery technology at a major global beverage brand, with direct replication potential across Diageo's 100-plus production facilities worldwide.