What is intermittent energy?
An intermittent energy sources is a power generation type that cannot ensure consistent and reliable electricity to match electricity demand. The intermittency of these power sources can either be entirely predictable, such as tidal energy, or unpredictable, such as wind power. To deal with intermittency, electricity grid controllers must have base-load power sources available to fill in gaps when intermittent sources are not providing sufficient power to meet demand. Storing power for future use can also help; however, current storage technology has significant inefficiency challenges.
What is base-load power?
Base load power is the minimum amount of constantly required electricity over a certain period to meet electricity demand. Base load power sources are those electricity generation providers that can consistently and reliably ensure base load power is met.
Where can I go to learn more about which states have Renewable Portfolio Standards?
The U.S. Energy Information Administration provides updates on the states that have RPSs and how those RPSs are structured. You can learn more here.