The town where Sanjay and his family live wants to cut back on their use of non-renewable resources at home. The town is located in Texas. The town's people want to cut their dependency on non-renewable resources. They also want to minimize the amount of particulate matter they put into the atmosphere. Texas is one of the leading states in wind power, but the town wants to add other renewable, non-polluting, energy resources to their energy plan. What resources, other than wind energy, fit the bill?