Temple Fennell
Co-Founder & Managing Director @ Clean Energy Ventures
Cambridge, United States
Temple Fennell is a co-founder and Managing Director at Clean Energy Ventures, an early-stage venture capital fund focused on investing in companies commercializing breakthrough energy technologies addressing climate change. He has more than 20 years of experience as an entrepreneur and as an investor deploying capital for his single-family office,Keller Enterprises, a member of the CREO Syndicate. He is member of MIT’s Renewable Finance Roundtable, a Senior Fellow at the University of Zurich, holds an MBA as a Sloan Fellow from MIT and an Engineering BS from the University of Virginia.
- Total investments:
- 13
- Last investment:
- Lead investor:
- 85%
Last updated:
For AI agents: llms.txt
Industries Temple Fennell invests in
Stages Temple Fennell invests in
Countries Temple Fennell invests in
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
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Investment Focus
Industry
- Renewable Energy 3 (23%)
- Solar 2 (15%)
- Energy 2 (15%)
- Manufacturing 2 (15%)
- Battery 1 (8%)
Stage
- Seed 3 (23%)
- Series A 3 (23%)
- Convertible Note 2 (15%)
- Pre-Seed 1 (8%)
- Funding Round 1 (8%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| MacroCycle is developing a technology to curb the usage of fossil fuel derived plastic through a circular, sustainable and zero-carbon plastic upcycling process. The company's proprietary process based on the synthesis of cyclic macromolecules enables us to produce virgin-grade recycled PET from plastic waste at lower energy use thantraditional processes. | $6.5M / Seed / Feb 06, 2025 | ||
| Evari is a clean-tech firm developing next-generation tiny, oil-free turbocompressors for heating and cooling applications to help with the global energy transition and expedite the decarbonization of various industries. | $7.5M / Seed / Mar 26, 2024 | ||
| Aqua Membranes is revolutionizing RO membrane filtration with its unique printed spacer technology. The Polymer is applied directly to the flat sheet membrane to create a customized raised pattern that replaces conventional extruded mesh feed spacers. Unlike traditional membrane spacers that trap particles and biofilm within the spacer mesh andthereby obstruct flow, the printed dimensional spacers optimize flow patterns and turbulence throughout the membrane element, minimizing the entrapment of particulates and organic fouling. Printed spacer technology also increases permeate flow, improves flux and recovery, minimizes system pressure drop, and extends the operational life of a membrane element.Aqua Membranes' unique technology is perfect for spiral-wound membrane manufacturers eager to improve their product performance and whose customers demand more durable, low maintenance elements that can withstand challenging feed streams. Its technology provides a more open design and reduces fouling. Their technology offers a significant reduction in both Capital and Operating Expense in membrane plant operations. | Sep 25, 2023 | ||
| Leading Edge Crystal Technologies is a developer of kerfless, single crystal silicon wafers intended to be used in solar panels with higher efficiency and lower cost that fit into existing module manufacturing processes without any changes. | $2.5M / Convertible Note / Jul 01, 2021 | ||
| Leading Edge Crystal Technologies is a developer of kerfless, single crystal silicon wafers intended to be used in solar panels with higher efficiency and lower cost that fit into existing module manufacturing processes without any changes. | $7.6M / Series A / Oct 27, 2020 | ||
| SunDensity has developed a groundbreaking Photonic Smart Coating (PSC™) technology that enables the up and down conversion of the wavelengths in white light (UV to IR) to match the desired band which can solve several in-efficiencies in photonics. By conversion of spectrum, they have developed, and field tested a patent-pending PSC™ thatsignificantly reduces the cost of electricity generated by solar photovoltaics (PV) applications, customizes thermal and optical behavior of architectural glass, and increases the quantum efficiency of optoelectronic instruments. | $2.5M / Convertible Note / Oct 14, 2020 | ||
| Aqua Membranes is revolutionizing RO membrane filtration with its unique printed spacer technology. The Polymer is applied directly to the flat sheet membrane to create a customized raised pattern that replaces conventional extruded mesh feed spacers. Unlike traditional membrane spacers that trap particles and biofilm within the spacer mesh andthereby obstruct flow, the printed dimensional spacers optimize flow patterns and turbulence throughout the membrane element, minimizing the entrapment of particulates and organic fouling. Printed spacer technology also increases permeate flow, improves flux and recovery, minimizes system pressure drop, and extends the operational life of a membrane element.Aqua Membranes' unique technology is perfect for spiral-wound membrane manufacturers eager to improve their product performance and whose customers demand more durable, low maintenance elements that can withstand challenging feed streams. Its technology provides a more open design and reduces fouling. Their technology offers a significant reduction in both Capital and Operating Expense in membrane plant operations. | $2.1M / Series A / Sep 22, 2020 | ||
| Leading Edge Crystal Technologies is a developer of kerfless, single crystal silicon wafers intended to be used in solar panels with higher efficiency and lower cost that fit into existing module manufacturing processes without any changes. | $2.6M / Convertible Note / Feb 20, 2020 | ||
| Rebound Technology is rethinking refrigeration through tailored, thermally-driven heat pump architectures that provide efficient, practical, and cost-effective global solutions. Its tailored development approach enables dramatic improvement over the one-size-fits-all, state-of-the-art by utilizing renewable resources, waste heat capture, energystorage, and simple, low-cost construction. Rebound is currently developing two unique and potentially transformative technologies. IcePoint is a refrigeration cycle with embedded thermal energy storage, designed to save supermarkets 60% on their low-temperature cooling costs. SunChill is an ultra-low-temperature thermal cycle, designed for developing world agricultural applications, to convert 50C solar thermal energy into 10C refrigeration using locally sourced materials. Each technology represents a departure from the one-size-fits-all energy approach of the 20th century and instead focuses on tailored technologies that solve smaller problems better. This path reduces the cost of renewable/efficient systems by at an order of magnitude while at the same time growing self-sustaining businesses that create jobs without reliance on government incentives. It is currently funded by US Federal Government research grants. | $5M / Series A / Jan 16, 2020 | ||
| Leading Edge Crystal Technologies is a developer of kerfless, single crystal silicon wafers intended to be used in solar panels with higher efficiency and lower cost that fit into existing module manufacturing processes without any changes. | $1.5M / Seed / Jul 01, 2019 | ||
| See all 13 investments → | |||
Co-Investors
About Clean Energy Ventures
Clean Energy Ventures invests in seed-stage climate tech startups in North America, Europe, and Israel. The company's investments are commercializing disruptive clean energy technologies and business model innovations and achieving significant scale by taking advantage of market-driven forces to address climate change.
Clean Energy Ventures Contacts
| Name | Phone | Socials | |
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Daniel Goldman
Co-Founder & Managing Director
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David S. Miller
Co-Founder & Managing Director
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Michael Herzig
Venture Partner
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Temple Fennell
Co-Founder & Managing Director
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Jeffrey Weiss
Senior Venture Partner
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FAQ
What does Temple Fennell invest in?
Temple Fennell invests primarily in Renewable Energy, Solar and Energy startups, most often at Seed and Series A stage. Most of the 13 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact Temple Fennell?
Public channels for Temple Fennell include LinkedIn, X (Twitter) and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Temple Fennell last invest?
The most recent investment recorded for Temple Fennell closed in Feb 2025. Shizune tracks 13 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Nov 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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