The Department does not model tree equivalents of biomass used by power generators. Ofgem reports volumes of biomass fuel, such as wood pellets, used by power generators on a per-tonne basis.
UK tree planting statistics, held by the Department of Environment, Food and Rural Affairs (Defra), are reported in terms of area (hectares). The most recent data was published on 30th September (https://www.forestresearch.gov.uk/tools-and-resources/statistics/forestry-statistics/forestry-statistics-2021/1-woodland-area-planting/ and https://www.forestresearch.gov.uk/documents/8144/Ch1_Woodland_FS2021_kRWbQlW.xlsx). UK tree planting over the past five years was as follows: 6,520 ha (2016-17); 9,050 ha (2017-18), 13,540 ha (2018-19), 13,660 ha (2020-21) and 13,290 ha (2020-21)