42 Analysis in the field of renewable energy production, such as solar power, solar thermal power, geothermal energy, wind turbines, and biofuels; Engineering services, namely, engineering in the field of renewable energy production, such as solar power, solar thermal power, geothermal energy, wind turbines, and biofuels; and Design in the field of renewable energy production, such as solar power, solar thermal power, geothermal energy, wind turbines, and biofuels