Across the UNECE region, understanding how wood energy use relates to forest resources and energy supply remains a central question for policy. These relationships are reflected in material flows from forests and forest-based industries into energy supply. Drawing on data from the Joint Wood Energy Enquiry (JWEE), this report shows that increasing wood energy consumption has coincided with declining reliance on roundwood and a growing contribution from industrial by-products, processed wood-based fuels and post-consumer recovered wood. Over the same period, the share of forest net annual increment directly used for energy remained broadly stable, even as wood energy increased its contribution to total primary energy supply. Together, these developments point to changes in the composition of feedstocks, uses and consuming sectors rather than a simple intensification of harvest pressure, while cross-country differences reflect variation in forest endowments, industrial structures and trade patterns.