Sawing of materials; processing of fuel materials; upcycling [waste recycling]; reprocessing of lubricating oil; water treatment and purification; processing and transforming of energy; production of energy; generation of gas and electricity; production of energy by power plants; electricity generating; consultancy in the field of energy generation; production of electrical energy from renewable sources; tinting of car windows; custom assembling of automobile bodies and chassis for others; processing of automobile brake drums; processing of automobile disc brake; custom manufacture of molded metal parts; custom manufacture of molded plastic parts; custom manufacturing of aircraft; custom assembly of aircraft; car scrapping service being destruction of waste; rental of water and air purification equipment; treatment of hazardous substances; rental of energy generating equipment