How electric vehicles impact the grid
Jan/Feb 2023
by Katherine Loving, Contributing Columnist
Last year saw a record increase in electric vehicle (EV) sales, and experts are predicting that by 2035, many major vehicle manufacturers will only produce electric models. A 2021 study by the Department of Energy showed that increased electrification, or replacement of direct fossil fuel use with electricity, would account for a 38% increase in electricity demand by 2050—and EVs will play a major role in this increased electrification.
The need for more electricity will have a major impact on the nation’s grid, which means power supply and grid infrastructure must be carefully planned to accommodate the increased need for electricity.
EV charging presents new challenges in maintaining the electric grid. Fully charging an EV battery requires the same amount of electricity needed to power a home during peak energy use times. However, EV charging is a concentrated pull of energy over an extended period, which can add stress to the local power grid by increasing the amount of electricity a utility has to provide.
Additionally, the neighborhood transformer needs adequate capacity to handle the increased load. EV charging can shorten the lifespan of transformers by straining and overloading their capacity if they are not matched to a neighborhood’s energy needs.
Electric cooperatives are currently identifying ways to manage this new pattern of electricity use, though exact strategies will vary based on each utility’s unique needs. Analyzing energy load patterns or identifying where and when the local grid has spikes in demand can provide electric co-ops with data on where to place higher-capacity transformers.This analysis can also provide a picture of overall energy use and patterns to help forecast energy consumption for the future. Planning system maintenance and upgrades are also part of that long-range forecasting; however, this has been recently complicated by supply-chain issues with transformers, with wait times that are upwards of one year.
EV owners can play a role in reducing energy costs and system stress associated with charging. Check with your local electric co-op to see if they offer an EV charging rate. Typically, an EV rate incentivizes charging during the night, when electricity demand and wholesale energy rates are lower. Charging at night is also a great way to ease demand in your neighborhood, even without a special EV rate.
Another potential change on the horizon is a new energy peak time. EV drivers that plug-in to charge as soon as they return home from work would create even more electricity demand during this busy time of day. But if EV drivers use a timer to schedule charging at night, the electricity demand could be spread over a longer period to reduce stress on the grid.This would be especially beneficial for neighborhoods with multiple EV drivers.
EVs are only expected to increase in number. Electric co-ops and EV owners both have roles to play in accommodating increased demand. If you own an EV, let your electric co-op know so they can better plan energy demand for you and your neighbors.
Katherine Loving writes on consumer and cooperative affairs for the National Rural Electric Cooperative Association.