Electricity generation does produce emissions, although the amount of emissions are greatly reducing through the Renewable Portfolio Standard requirements. Utilities in California are required to have 50% of their retail sales from renewable sources by 2030. To meet this mandate, utilities are adding cleaner sources of energy to their mix all the time, especially as prices for solar continually decrease. Geothermal, wind and hydroelectricity are renewable sources that are available at night after the sun goes down. Sonoma Clean Power’s CleanStart default service is 49% renewable and the EverGreen service offers 100% local renewable energy day and night. PG&E’s default service is 39% renewable and the Solar Choice program offers 100% renewable solar energy.