Put solar panels on your roof and contact your energy company so they can be hooked up to provide power onto the grid and give you energy credits. Not every area allows this but from what I understand some folks make money in the summer and then that offsets the costs they spend pulling power from the grid in the winter.

You really need to do a lot of research to figure out if it's feasible and if you have enough sunlight, area for panels, etc. to make it worthwhile. There's a lot of upfront costs too with the panels, meters, and extra protections necessary for when you're interfacing with sending power onto the grid--a lot of folks need to run their system for 5-10 years or more before it breaks even and starts making them money vs. all the initial costs.