Interesting article PV Magazine, California electric car culture to cheaply cook the duck curve:
Researchers at the US Department of Energy (DOE) and Lawrence Berkeley National Laboratory (LBNL) have done the math on California’s 1.5 million zero-emission vehicle (ZEV) mandate and found that the cars’ batteries can meet the goals of the state’s 1.3 GW energy storage mandates by absorbing a healthy amount of daytime overproduction and mitigating the early evening duck curve ramp.
Learn more about the duck curve here.
To make it work, it’ll mostly take controllable one-way car charging from the grid (V1G) and a small amount of two way charging/discharging from the car and the grid (V2G) to be used on the worst day of each forecast year.
That’s right, use your EV as a battery to power your house after you get home in the evening.
He continues:
The first goal is to absorb the overproduction of daytime solar power by controlling when California’s 1.5 million electric cars charge. Researchers have shown that V1G vehicles can absorb up to 1 GW of daytime overproduction – almost as much as the 2025 1.3 GW mandate will be able to offset. These services are worth between $1.45-1.75 billion worth of stationary storage and could be implemented for $170 million.
In the early evenings, if V2G capabilities are enabled, up to 5 GW of ramping requirements can be saved. The authors suggest the value of these services, relative to stationary storage deployments, to be worth $12.8 to $15.4 billion, costing only a slight bit more than the $170 million costs above. This value is substantially more than the mandate’s 1.3 GW can handle….
Research has suggested that 12 hours of energy storage would allow the continental United States reach 80% solar+wind based upon nationwide production curves. The nationwide 5.4 TWh requirement would require 108 million 50 kWh electric cars. There are about 263 million passenger vehicles in the USA, and the base Tesla Model 3 has a 50 kWh battery.
Broadly speaking, this report shows that vehicles can be an integral part of energy storage in the US and, if we do it right, they might significantly support the evolution of the grid. If we can figure out some sort of vehicle feed-in tariff and pay ourselves directly while doing it, this will only speed up the process.
Indeed. Getting the continental US to 80% solar + wind would be great.