Forest pennant uses a unique source of pennant sandstone to create paving and walling products for commercial uses. This is also extracted from the company's quarry at Barnhill and has access to the UK's only sustainable source of blue pennant sandstone. its natural stone products are among the lowest carbon rated in the uk. harnessing the power of the river lyd forest pennant generates about 70% of its electricity requirement using a micro hydro turbine.