From the Document: "Use of solar energy for electricity generation is growing in the United States and globally. In the United States, solar energy overall accounted for 2.2% of total electricity generation in 2018, up from 0.7% in 2014. This report addresses a dozen frequently asked questions that may be of interest to lawmakers as the growing use of solar energy potentially affects a variety of areas of congressional interest. The first set of questions looks at different technologies that use solar energy to generate electricity and their costs and prevalence over time. Costs for all components of solar photovoltaic (PV) systems, including cells, modules, inverters, and other related equipment, have generally declined in recent years. Assessing solar energy costs for consumers is challenging because there are many local factors to consider. Another question considers whether using solar energy is a reliable form of electricity generation given its variable nature."
CRS Report for Congress, R46196
Congressional Research Service: https://crsreports.congress.gov/