Skip to content

Startup Portfolio: Long-duration Storage

Meet Our Latest Startups: Cohorts 22-2 and 22-3!

As part of our effort to move the needle—and the market—on climate tech, D3 is proud to announce Cohorts 22-2 and 22-3. Alongside a general cohort (22-2) comprising 29 promising climate tech startups, we’re also excited to introduce our first focused cohort of 5 additional startups (22-3) zeroing in on a critical area: carbon dioxide removal (CDR).


Developing low-cost energy storage solutions for many applications ranging from fast frequency response (FFR) and over electric mobility, to long-duration energy storage (LDES).

Read More

Antora Energy

Building inexpensive long-duration energy storage using high-efficiency thermophotovoltaics.

Read More

Cache Energy

Developing long duration energy storage technology that can be safely installed anywhere and transported everywhere.

Read More

Energy Dome

Developing a low-cost and efficient system for long-duration electricity storage using liquid CO2.

Read More

XL Batteries

Developing a novel chemistry for a 20+ year, non-flammable flow battery.

Read More

Zinc8 Energy Solutions

Developing innovative battery technology that uses zinc and air as fuel, resolving the intermittent and unpredictable nature of renewable sources.

Read More


Accelerate your success and speed to market with us

We’re here to help you bridge critical finance and resource gaps by uniting and aligning the world’s most promising climate tech startups—like you—with D3’s network of committed investors, corporate partners, market experts, and mentors.

Apply to Third Derivative