Ecological meadow communities with participation of species from the Carex family are quite common in the region of Wielkopolska in river valleys characterized by high levels of ground waters. They are considered as naturally valuable areas and remain closest to natural environment. In general, they are of poor fodder value but have high natural value and the biomass obtained from them is utilized as energy raw material for production of briquette and pallets. Detailed investigations of ecological meadows with sedge participation were carried out during the 2009-2010 summer season in Wielkopolska Voivodeship in the Noteć River valley. In the documented phytocenoses, in the course of analyses, the following parameters were determined: moisture sites, natural value, mean valorization number, natural values (according to valorization numbers) as well as valorization class and use value (Lwu). In addition, laboratory analyses of main parameters for selected sedge species such as: heat of combustion, calorific value measured in MJ/kg, moisture content and ash in % dry matter were determined. In the case of communities with a clear domination of Carex gracilis and Carex acutiformis, mean valorization numbers of 3.9 and 3.4, respectively, were recorded, their natural value was evaluated as high, whereas the valorization class was assessed as VIII (C) in both cases. The analysed phytocenoses were found to contain strictly protected species of Dactylorhiza majalis, Ophioglossum vulgatum, Lister Abbot, Viola and Helodium stagnina blandowii, as well as species under partial protection: Calliergonella cuspidata, Climacium dendroides, Rhytidiadelphus squarrosus.