The 52nd volume of the journal presents research results and engineering solutions in green building materials, modelling and calculations by structural mechanics approaches of embankment dams, cantilever retaining walls and assessment of the hygrothermal performance of bioclimatic innovative constructions for onion bulb preservation. This publication also presents the investigation of the effectiveness of some polymer polyacrylamide-based flocculants in the process of extraction of the metal and scale particles formed in the working electroerosive machining fluids, discusses the net-zero initiative for coal-fired power plants in Southern African Development Community in perspective to 2050 and explores the creation of a simulator for addressing the problem of predicting the response of Nigeria's Kainji Hydro Power Plant to system load variations and determining parameters for stable operation. The volume will be useful to engineers in construction, machinery, power engineering and ecological safety.