Okay, let’s tackle this. So Marvin has skills in solar and green building, which are in demand, especially in the Detroit area. However, his hourly rate is likely to be lower compared to professionals with more technical expertise or those in high-demand industries. Considering his skills and location, I estimate his hourly rate to be around $100, which is a rough estimate based on national averages for energy management and related fields. This rate is also influenced by the fact that he has a broad range of skills, but may not be an expert in any one area. To give you a better idea, here are some national averages: Energy Managers can charge $75-$125 per hour, while Solar Panel Installers can charge $50-$100 per hour. So, my estimate of $100 per hour seems reasonable, but it's always subject to change based on industry conditions and demand.