Take a Cool Guess—The Fun Quiz on Renewable Energy and Environmental Sustainability. Today’s Topic: Renewable Energy Hardware

Question: What do you suppose these screws are, pictured left? Hint: though they come in different sizes and shapes, these are approximately six feet long.

Answer: Can be found at Clean Energy Answers.

Relevance: There are three main methods of anchoring solar PV to the ground: pilings driven into the earth, extruded concrete rail, and these guys.