All Newly manufactured residential structures in California are obligated to obtain solar panels set up as a means to cut back carbon emissions and promote renewable energy. Energy credits are awarded to homeowners at a level of 75% fewer than their prior payments. NEM3 is shorthand for your 3rd version https://commercialsolaragencynearme.blogspot.com/2025/01/tips-to-save-more-on-your-energy.html