David Miller is a venture capital investor at Clean Energy Ventures who went from being a startup founder and Lucent New Ventures director to earning a PhD in Engineering Systems focused on clean energy ventures, and he created the Simple Emissions Reduction Calculator (SERC) that CEV uses to estimate whether technologies can mitigate at least 2.5 gigatons of CO₂e by 2050. He requires every prospective portfolio company to show a credible path to mitigating 2.5 gigatons of greenhouse gas emissions by 2050 and co-designed one of the first suburban net-zero homes that was featured on "This Old House" as a model proving net-zero living doesn't require lifestyle sacrifice.
About their Fund
Clean Energy Ventures
Sectors
Climate, Energy, Materials, Deeptech / Hardware, Transportation
Rounds
Seed - Series A
Avg Check Size
$100K - $5M
Notable Investments
Clean Energy Ventures requires every investment to be capable of mitigating 2.5 gigatons of CO₂ by 2050 using their own quantitative calculator, and more than 60% of their investment team has advanced science or engineering degrees to provide hands-on technical support rather than just financial backing. The firm grew out of a group that has been investing since 2005 with only about 15% write-offs in hardware-focused cleantech—an unusually low loss ratio in a sector where over 90% of companies funded after 2007 failed to return capital.
Notable Fund
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