# Philip Keller

> Philip Keller is the CEO and co-founder of Source Energy, a Colorado manufacturer working to make spacecraft solar power more available, affordable and repeatable. His path runs from deployable-array research at Composite Technology Development, through building Roccor's satellite solar-array business, to founding Source with Bryan Mazor in 2021. The company emerged from stealth in 2024 after its panels flew on Impulse Space's Mira vehicle, and it now says it has served more than 25 customers, built 10 MW of annual capacity and put silicon-module production at the center of its scaling strategy.

- **Role:** CEO and Co-Founder at Source Energy Company
- **Organizations:** Source Energy Company, Roccor, Redwire, Composite Technology Development, i2C Solutions
- **Education:** The University of Iowa, College of Engineering
- **Known for:** Built Roccor's satellite solar-array business into a top-performing product line before Roccor's acquisition by Redwire., Established a CTD business unit associated with a U.S. Marine Corps program of record for 2,500 power systems., Served as principal investigator on a 2020 U.S. Air Force SBIR award for lunar-oriented SmallSat solar-array development.

## Career timeline

- **2007** — Co-authored an AIAA conference paper on a low-cost deployable solar array for the TacSat-4 Standard Bus.
- **2013** — Presented CTD's deployable articulating solar-array work for nanosatellites at the Small Satellite Conference.
- **Before 2020** — Built the satellite solar-array business unit at Roccor after earlier establishing a CTD business unit tied to a U.S. Marine Corps program for 2,500 power systems.
- **2020** — Served as principal investigator on Roccor's U.S. Air Force SBIR award for a lunar articulating solar-panel system.
- **2021** — Co-founded Source Energy Company with Bryan Mazor in Colorado.
- **2023** — Source hardware reached orbit; the company also closed a $6.5 million seed round led by Alpine Space Ventures.
- **2024** — Source emerged from stealth after its solar panels powered Impulse Space's Mira orbital transfer vehicle; Keller also announced a $250,000 Colorado Advanced Industries grant.
- **2025** — Source and Idemitsu Kosan announced a collaboration to develop CIGS solar products for higher-radiation missions.
- **2026** — Source announced a Dcubed deployment-hardware partnership and moved an automated shingle-matrix silicon-module process into production.

## Achievements

- Built Roccor's satellite solar-array business into a top-performing product line before Roccor's acquisition by Redwire.
- Established a CTD business unit associated with a U.S. Marine Corps program of record for 2,500 power systems.
- Served as principal investigator on a 2020 U.S. Air Force SBIR award for lunar-oriented SmallSat solar-array development.
- Co-founded Source Energy in 2021 and led it from stealth to flight heritage on Impulse Space's Mira vehicle.
- Helped secure a $6.5 million seed round for Source Energy in 2023 and a $250,000 Colorado Advanced Industries grant in 2024.

## Latest updates

- **2026-08** — Source and Fraunhofer ISE announced space-qualified silicon modules built with shingle-matrix interconnection; Source said it had installed the automated production equipment in Colorado in June.
- **2026-08** — Source announced a partnership with Dcubed around resettable release hardware for repeatable solar-array deployment testing.
- **2025-11** — Source and Idemitsu Kosan announced plans to co-develop CIGS solar products for high-LEO, MEO and other high-radiation missions.

## Links

- Website: https://source.space
- LinkedIn: https://www.linkedin.com/in/philip-keller-21b20411

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Profile page: https://yespress.io/philip-keller
Published by YesPress — https://yespress.io
Last updated: 2026-08-26