Alt Carbon

Alt Carbon

Accelerator of natural silicate weathering for permanent carbon removal

Founded

2023

Headquarters

Kolkata (India)

Status

Seed

Company Details

Alt Carbon is a pioneering climate-tech company focused on large-scale, permanent carbon dioxide removal (CDR) in India and South Asia. The company’s innovative approach leverages Enhanced Rock Weathering (ERW)—spreading waste basalt rock dust on agricultural land—to sequester atmospheric CO₂ for thousands of years while improving soil health and crop yields.

Products & Services 

  • Enhanced Rock Weathering (ERW): Applies proprietary basalt rock dust blends (Hari Maati) to agricultural land, accelerating natural carbon mineralization to permanently sequester atmospheric CO₂ for over 10,000 years.

  • Carbon Removal Credits: Generates and sells high-integrity, traceable carbon credits to global corporations, climate funds and marketplaces, verified through advanced measurement and reporting systems.

  • Darjeeling Revival Project (DRP): Flagship initiative transforming tea estates and farmlands into climate action hubs, restoring degraded soils, improving crop yields and supporting local livelihoods.

  • Soil & Crop Productivity Enhancement: Supplies nutrient-rich basalt blends to farmers, boosting soil health, increasing agricultural yields and providing co-benefits for local communities.

  • Scientific MRV Services: Operates advanced labs (Darjeeling Climate Action Lab) for rigorous, low-cost measurement, reporting and verification (MRV) of carbon removal, supporting both in-house and third-party ERW projects.

Business Model & Revenue Streams

  • Carbon Credit Sales: Primary revenue from selling verified, high-quality carbon removal credits to multinational corporations, climate funds and carbon marketplaces seeking to meet net-zero commitments.

  • Advance Market Commitments (AMCs): Secures pre-purchase and offtake agreements from global buyers (e.g., Frontier, NextGen, MOL Group), providing upfront capital and guaranteed demand for future carbon removal.

  • Project Partnerships: Collaborates with tea estates, farmers and landowners to deploy ERW, sharing revenue from carbon credits and offering co-benefits such as improved yields and soil health.

  • Scientific Services & Licensing: Offers MRV technology, lab services and proprietary geochemical models (like FELUDA) to partners and other CDR projects.

Customer Segmentation

  • Global Corporations & Climate Funds: Companies and funds needing high-quality, permanent carbon removal credits for net-zero goals.

  • Carbon Marketplaces & Buyer Coalitions: Platforms and groups (e.g., Frontier, NextGen, MOL Group) purchasing carbon credits in advance.

  • Farmers, Tea Estates & Landowners: Partners adopting enhanced rock weathering for soil health, yield improvement and revenue from carbon credits.

  • Industries Facing Carbon Regulations: Sectors like airlines, exporters and manufacturing impacted by carbon offset requirements.

Growth Strategy

  • Market Expansion: Scaling ERW deployment from pilot projects to 500,000 hectares by 2030, targeting 5 million tons of CO₂ removal annually and expanding across South Asia.

  • Product Innovation: Investing in advanced MRV, machine learning models and scientific R&D to ensure credibility and efficiency at scale.

  • Strategic Partnerships: Building alliances with global buyers (Frontier, NextGen), corporations (Mitsubishi, MOL Group), and local institutions for technology, talent and project execution.

  • Policy & Ecosystem Building: Leading advocacy for high-integrity CDR and building India’s scientific infrastructure for climate action.

Key People

Shrey Agarwal

Sparsh Agarwal

Key Metrics

Total Equity Funding

$12.6 Million

No. of Funding Rounds

2

Latest Funding Round

$12.0 Million, Seed

as of May 21, 2025

Post Money Valuation

$3.22 Million

as of March 9, 2024

Funding Multiple

-

as of N/A

Investors

PointOne Capital

and 2 more

Employee Count

28

Similar Companies

N/A

Exit Details

-

All Funding Rounds

DateRound NameAmountValuationRevenueRevenue Multiple
Investors
May 21, 2025Seed $12.0 Million----
December 20, 2023Seed $550.0 K$3.2 Million-- Shastra VC, PointOne Capital, Utsav Somani, Angel List, Apogee Capital Advisors

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