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Enter bidirectional charging. Think of bidirectional charging like a two-way street for electricity. Instead of traffic flowing in just one direction, energy can travel both ways—into your car when it needs charging, and back out when your home needs power. A bidirectional EV charger is much smarter than a regular EV charger.
Scenarios that call for bidirectional power supplies in EVs and EV charging stations include: EV supplying power back to the grid or to a microgrid in the home. EV charging station supplying power to an EV either from the grid or from stored energy depending on relative electricity prices.
After years of promises, bidirectional chargers are starting to reach the market, but availability remains limited, and costs are high. According to a 2023 study by the Smart Electric Power Alliance (SEPA), compared to one-way EV chargers, “the price premium was between $8,500 and $9,000” for residential bidirectional charging systems.
With a bidirectional charger, your EV becomes part of a larger distributed energy network that helps stabilize the grid and makes room for more renewable energy sources like wind and solar. Bidirectional charging is still a new and evolving technology. Here are a few areas of development to be aware of:
These benchmarks help measure progress toward goals for reducing solar electricity costs and guide SETO research and development programs. Read more to find out how these cost benchmarks are modeled and download the data and cost modeling program below.
The suite of publications demonstrates wide variation in projected cost reductions for battery storage over time. Figure ES-1 shows the suite of projected cost reductions (on a normalized basis) collected from the literature (shown in gray) as well as the low, mid, and high cost projections developed in this work (shown in black).
Battery storage costs have evolved rapidly over the past several years, necessitating an update to storage cost projections used in long-term planning models and other activities. This work documents the development of these projections, which are based on recent publications of storage costs.
The 4-hour cost projections in this report are much lower in 2024 primarily due to the updated initial cost from the bottom-up cost model used in this work. The lower costs persist through 2050 because of that lower starting point. Table 2. Values from Figure 3 and Figure 4, which show the normalized and absolute storage costs over time.
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