2020, A Biggly Bad Year: At Least EVs as a Grid Resource Made Headway

It seems counterintuitive that we can get so much value from using the grid to one-way (unidirectional) charge EVs, doesn’t it? California’s Vehicle-Grid Integration working group, sponsored by the California Public Utilities Commission (CPUC), submitted its final report in June 2020, which recommended a whole suite of use cases for EV smart charging [1].

Going forward, possibly eighty percent of the EV’s value to the grid, could come from unidirectional smart charging, substantially shoring up grid resiliency and stability.

Vehicle-to-Grid – V2G

Not to be outdone, vehicle-to-grid (V2G), both AC and DC, made significant gains in 2020. V2G enables power from EVs to flow back to the grid when called upon. This type of power flow has many niche applications including, vehicle-to-home (V2H) during emergencies, Public Safety Power Shutoffs (PSPS) during wildfire emergencies, and peak shaving or shifting to alleviate high grid demand. V2G comes at a round-trip efficiency cost, and a potential battery capacity degradation cost. AC V2G also requires a bi-directional on-board charger, which converts the battery DC power to AC for discharge to the grid. Most current EVs have unidirectional on-board chargers, which would mean automakers would need to update their charger designs to comply with the revised standards.

One of those standards is Society of Automotive Engineers (SAE) J3072. SAE finalized the newest update to the AC V2G standard, J3072, in the fall of 2020. J3072 lays out the method of grid interconnection (IEEE 1547-2018), design requirements for the EV onboard charger, design requirements for the AC charger (also known as the Level 2 EVSE), and the communication protocol, IEEE 2030.5, which allows the EV to talk to the EVSE, and the EVSE to talk to the grid.

 source: Abbot, COVID Lockdown Graphics Dept.

Figure 1. SoCal Windfarm with EVs and Second Use Batteries as DERs

Maybe it was coincidence, but California Rule 21 Interconnection, which allows grid interconnection, was substantially revised September 24, 2020 [2]. At least it seems like coincidence, considering how interrelated Rule 21 is with J3072. The Rule 21 revision enables distributed energy resources, including energy storage projects, significantly easier access to the grid [3]. The Rule 21 revision is the final link in the chain that allows EVs to provide power to the grid via AC V2G. The California Investor-Owned Utilities (IOUs), Southern California Edison, San Diego Gas & Electric, and Pacific Gas & Electric are planning pilot programs to prove the concept and iron out any issues.

While AC V2G is primarily a light duty EV tool, DC V2G is primarily for medium- and heavy-duty EVs, and fleets. DC V2G takes power directly from the EV’s battery and uses the bi-directional DC charger to convert it to AC power for grid use. 2020 saw extensive activity surrounding DC V2G programs.

Market Trading – FERC 2222

The final, good news of 2020 for EVs came on September 17, 2020 when the Federal Energy Regulatory Commission (FERC) issued draft Order 2222 [4]. FERC Order 2222 is significant because it seeks to remove barriers for energy storage, including grid-connected EVs as energy storage, to participate in grid resource aggregation.

source: Abbot, COVID Lockdown Graphics Dept.

Figure 2. Clean Vehicle with Organic Energy Storage

Conclusion

While 2020, by almost any measure, was a disaster globally, the way forward to a sustainable EV future made significant gains, especially for grid-connected EVs. This bodes well for renewables replacing a fossil fuels powered grid, and getting us all to a carbon-free world.

References

1. Vehicle-Grid Integration Working Group, Final Report to the California Joint Agencies, CPUC DRIVE OIR Rulemaking R.18-12-006, June 30, 2020.

2. California Public Utilities Commission, Agenda ID # 18718, Rulemaking 17-07-007, Order Instituting Rulemaking to Consider Streamlining Interconnection of Distributed Energy Resources and Improvements to Rule 21. August 20, 2020.

3. Misbrener, K., CPUC Updates California’s Interconnection Rules to Better Accommodate Renewables Onto the Grid. Solar Power World, September 25, 2020.

4. Federal Energy Regulatory Commission, Docket: RM 18-9-000, September 17, 2020.

Author

Charles Botsford, PE is a professional chemical engineer in the State of California with 30 years’ experience in engineering process design, distributed generation, EV charging infrastructure, and environmental management. He participated in California’s Vehicle Grid Integration (VGI) Working Group and participates in the Society of Automotive Engineers (SAE) J3072 AC Vehicle-to-Grid standards committee. Mr. Botsford holds a bachelor’s degree in chemical engineering from the University of New Mexico, and a master’s degree in chemical engineering from the University of Arizona.