Mainspring Energy Appoints Tom Linebarger

Mainspring Energy announced a leadership change on June 10, 2026. Mainspring Energy appointed chairman and former Cummins CEO Tom Linebarger as CEO, with founder Shannon Miller named President, to accelerate growth in utility and AI data center markets.

What changed

Tom Linebarger was named Chief Executive Officer. Founding CEO Shannon Miller, who co-founded Mainspring in 2010, was appointed President, according to the release headline. She said she looks forward to engaging more deeply and directly in many of the company’s key operations.

Leader: Tom Linebarger
Role: Chief Executive Officer
Effective: Not specified in the announcement
Announcement date: June 10, 2026

Leadership background

Linebarger is Mainspring’s chairman and a former Chairman and CEO of Cummins, where he spent 30 years before retiring in 2023. He later served as a senior advisor at McKinsey and, from January 2025, as an energy-focused entrepreneur in residence at General Catalyst. He has chaired the Hydrogen Council, sits on the Republic Services board, and joined Mainspring’s board 14 months before the announcement.

The mandate

Mainspring said Linebarger will lead the company as it expands rapidly into utility and AI data center markets. Linebarger said he aims to help accelerate the company’s growth and expand its impact.

Why this matters for GTM teams

Executive appointments can precede changes in strategy, operating cadence, hiring, partnerships, and technology priorities. The useful signal is not the title alone: teams should watch the new leader’s stated mandate, prior playbook, organizational scope, and the initiatives announced during the first two quarters.

Source and methodology

This leadership profile is based on the company’s announcement. Roles, transition timing, and biographical details are presented as announced; SalesTools Research does not infer undisclosed succession plans.

Primary source: Mainspring Energy leadership announcement.