I am currently shopping for a windmill for my 5 acre property to supplement my electrical bill. when I was searching for financing options,  I stumbled upon Santee Cooper (a electrical provider in South Carolina).

A low-interest loan from Santee Cooper (current rate–1.25%),  allows you to finance energy efficient improvements and renewable energy resource projects for your home that should help you reduce your energy costs. You can apply for energy efficient improvement loans ranging from $500 to $20,000 with up to 60-months to repay loans over $1,000 or renewable energy resource loans up to $40,000 with up to 120-months to repay. All with no money down. Maximum outstanding loans per customer cannot exceed $20,000 for energy efficient loans and $40,000 for renewable energy resource loans. Combined maximum outstanding loans per customer cannot exceed $40,000.

Unfortunately these loans are only available to Santee Cooper customers in South Carolina. If anyone knows of anything like this available in Texas; please let me know.