The fee-based charging network will comprise about 200 fast-charging stations in, the San Joaquin Valley, the Los Angeles Basin, the San Francisco Bay area and San Diego County.

NRG will wire about 10,000 individual charging stations located at homes, offices, multifamily communities, schools and hospitals across the State.

NRG chief executive officer David Crane said with this agreement, the people of California will gain a charging infrastructure ready to support their current and future fleet of electric vehicles.

"And we will be helping the State meet its clean car goals as embodied by its Zero Emission Vehicle mandate," Crane added.

The agreement includes creation of a network that will bring a minimum of 200 direct current fast chargers to the state, about $100m in infrastructure investment over four years, and $20m in cash to go to the California Public Utility Commission.

It also calls for a minimum of 10,000 parking spaces retrofitted with wiring necessary to charge EVs at civic sites such as universities and hospitals, large worksites and multifamily buildings.