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Case Study II: Analyzing SCE’s new TOU rates with solar+storage

A large commercial rooftop solar system

We analyze whether choosing to store and shift energy (using a Tesla Powerwall 2 Li-ion battery) under a TOU rate plan provides any economic benefit. While the Tesla battery is a stand-alone storage solution, we’re evaluating it here as an addition to a new solar system.

Power arbitrage is accomplished by charging a battery at the lowest TOU rate, or from solar, and discharging the battery at a higher on-peak TOU rate period for an effective reduction in peak-hour energy costs. If the customer has a typical Southern California Edison (SCE) residential load profile, as shown below in Figure 1, there is a potential benefit from energy storage, provided the utility TOU rates have a high enough differential between off-peak and on-peak prices ($/kWh).

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