The Short Answer

Hydrochar is a solid, carbon-dense material produced by processing wet organic or mixed waste under heat and pressure, in a process called hydro-thermal carbonization (HTC). Once dried, it behaves like thermal coal in a few key ways:

• Similar energy density when burned

• Compatible with existing coal-handling and storage infrastructure

• Combustible in the same boilers and furnaces already built to run on coal

The difference is where it comes from — waste, not a mine.

How Something Made From Garbage Ends Up Looking Like Coal

This isn't a chemistry trick. It's the same natural process that creates coal in the first place, just compressed from millions of years down to a few hours. In nature, buried organic matter slowly loses water and oxygen under geological heat and pressure — a process called coalification — gradually becoming peat, then lignite, then coal. HTC recreates those same conditions deliberately: wet waste sealed in a reactor with water, heated to roughly 180-220°C, held under enough pressure to keep that water liquid rather than turning to steam.

Under those conditions, two chemical changes happen at once:

1. Dehydration — water is stripped out of the material at a molecular level, not just physically drained

2. Decarboxylation — oxygen-containing molecular groups break off as CO2

What's left behind is proportionally richer in carbon — which is exactly what makes it energy-dense and coal-like.

Why "Coal-Like" Actually Matters for Adoption

A lot of renewable energy alternatives require entirely new infrastructure to use — new boilers, new fuel handling systems, new supply chains. Hydrochar's biggest practical advantage is that it doesn't. Because it can substitute directly for thermal coal in existing combustion equipment, facilities don't need to rebuild their infrastructure to switch fuel sources. That's a meaningfully lower barrier to adoption than most alternative fuels offer.

The Emissions Picture

Even though hydrochar burns similarly to coal, it burns cleaner. Compared to an equivalent amount of energy from coal, hydrochar combustion typically produces:

Meaningfully lower CO2 output

• Reduced sulfur dioxide emissions

• Lower mercury release

• Less ash residue

• Reduced nitrogen oxide emissions

Combined with the fact that its source material (waste) would otherwise be sitting in a landfill or being disposed of through less controlled means, hydrochar represents a rare case where a "coal replacement" doesn't ask industry to accept a performance tradeoff for an environmental one.

Riven Global Holdings produces hydrochar through patented HTC technology at operating sites in the Philippines.