A battery can sell three types of products: resource adequacy (RA), ancillary services , and energy. RA revenue is a function of the capacity market rules (e.g., size of battery and duration), and is generally procured on a monthly or annual basis. As such, RA value is not directly impacted by short term energy and ancillary prices or dispatch. Ancillary services, especially regulating reserves, are currently profitable, but the market for them is very small compared to the size of the energy market. In the CAISO, for example, the current regulating reserve market is about 300 MW of “reg up” and 300 MW of “reg down.” Historically, the regulating reserve market was served by flexible hydro and natural gas. Source: EnergyGPS