Beginning 2020, all new homes in California will be required to incorporate rooftop solar. According to official sources, the new mandate is expected to add $10,000 to the cost of building a house, about $8,400 by the addition of solar panels and over $1,500 for implementing energy efficiency measures. However, the net savings from adding solar power will be around $40 a month ($500 a year), according to industry experts. Californians can use two business models to set up rooftop solar. They can either lease the solar panels or can set up the project under the renewable energy service company mode. This policy is in line with the state’s aim to make all new households “net-zero”, which means that a household must produce enough green energy to offset all the electricity and natural gas consumed over the course of a year.