Okay, let’s tackle this. So Peter Van Buren has a strong background in sustainability, energy efficiency, and renewable energy. His skills are in high demand, especially in the US market. Location is Baltimore, MD, which is a hub for environmental and energy-related services. Considering his expertise and location, I estimate his hourly rate to be around $125, which is slightly below the national average for sustainability consultants. This rate is also in line with what I've seen for energy auditors and green building experts. It's a solid estimate, but may vary depending on the specific project requirements and client budget.