Since its establishment in 1968, KLIMIS has been using olive waste as a resource. They make heating fuel from Greek olive stones, using it to power their lime production.

The woody part of olive pits (a by-product from pomace factories) is a solid and sustainable biomass fuel, and therefore a renewable energy source derived from the process of collecting olive oil. KLIMIS compresses olive pits either in an oval shape to create briquettes or in a polygonal shape to create logs (with a hole along their axes) suitable for stoves, wood boilers, pyrolysis boilers and fireplaces. They are 100% natural products, free from chemicals and have a high heating power of 5153kcal/kg.

In 1992, KLIMIS began collecting the black powder produced by the incomplete combustion of the woody part of olive pits in the kiln to create (EU-patented) barbecue briquettes which do not emit odours or produce smoke or sparkles. They are easy to light up, free from chemicals, have a high heating power of 6366 kcal/kg, and emit 30% less carbon monoxide than wood charcoal.