This limestone battery can achieve 100+ hour heat storage without lithium and zero standby losses.

Industrial heat is a $1T+ problem, but most solutions ignore storage, especially those using ancient chemistry.

Arpit Dwivedi is the founder and CEO of Cache Energy, building thermal storage systems for industrial decarbonization.

Cache uses calcium oxide chemistry to store and release heat, targeting sub-1,000°F processes that represent ~75% of global industrial demand, with modular systems designed for rapid deployment and low cost.

Here’s what we discussed:

• Unit economics anchored in materials, not breakthroughs – Limestone feedstock at <$500/ton, 95% off-the-shelf hardware, and a small proprietary binder that enables pellet durability and repeat cycling without degradation typical of lime powders

• Operational performance that mimics baseload fuel – 100+ hour discharge with effectively zero standby losses over 6–9 months, allowing customers to arbitrage cheap off-peak electricity into constant, gas-like heat output

• Deployment speed as wedge – Containerized 2MW systems installed and operational within hours (e.g., University of Minnesota), eliminating long EPC timelines and specialized on-site labor

• Proven industrial ROI, not pilots – Single-process retrofit at a Fortune 500 Midwest manufacturer reduced natural gas consumption ~98%, with expansion to additional plants based on measured performance

• Financing unlocks adoption – Leasing model with flat monthly pricing, uptime guarantees, and full O&M removes capex friction while enabling transition to $150–200M project finance-backed scaling

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