2.1.1. Electricity Generation Data per Technology (Hourly Resolution)

The Congress of the United States of America conceived an Open Access Same-time Information System (OASIS) with the Energy Policy Act of 1992, aimed at improving energy efficiency [32], and the Federal Energy Regulatory Commission (FERC) formalised the OASIS with two orders in 1996 [33,34]. Accordingly, CAISO developed an OASIS to provide market observers with easy access to electricity generation historical data [35]. This article is based on historical data for net electricity generation from the OASIS archive, collected separately for each technology and in hourly resolution for the entire baseline year of 2018.

#### 2.1.2. Electricity Imports Data (Hourly Resolution)

The OASIS archive also provides data for electricity power transferred to the California state's grid from other states to satisfy the in-state demand (electricity imports). Imports accounted for 27% of 2018 demand. Such imports are taken into account here for balancing the supply and demand profiles but are excluded from the scope of the environmental and energy assessment, since the latter are focused on the domestic grid mix of the California state.
