42 Engineering services, namely, engineering for the production and distribution of energy, namely, electricity, heat, biofuel, from renewable sources including photovoltaic solar energy, wind energy, biogas, biomass; design and development of environmental installations enabling production and distribution of energy, namely, electricity, heat, biofuel, from renewable sources including photovoltaic solar energy, wind energy, biogas, biomass; engineering services, namely, engineering for environmental systems for the supply and transport of gas; technical scientific studies in the field of the production and distribution of energy, namely, electricity, heat, biofuel, from renewable sources including photovoltaic solar energy, wind energy, biogas, biomass; technical scientific studies and research in the field of gas exploration; technical scientific studies and research in the field of the production and distribution of energy, namely, electricity, heat, biofuel, from renewable sources, photovoltaic solar energy, wind energy, biogas, biomass; engineering services, namely, engineering for the gas industry; engineering design services; research and development of new products in the field of the production and distribution of energy, namely, electricity, heat, biofuel, from renewable sources including photovoltaic solar energy, wind energy, biogas, and biomass; consulting and energy auditing services with respect to energy saving, energy consumption and energy efficiency; research, studies and consulting in the field of environmental protection and sustainable development; quality control services in the field of installations enabling production and distribution of energy, namely, electricity, heat, biofuel, from renewable sources including biogas, biomass, biofuels, photovoltaic solar energy, wind energy; construction planning, namely, advice in drawing up construction plans