best sce tou plan for solar
In this instance, the customer gets the best economic results by simply switching to TOU rates. How many Tesla batteries are required to cover our on-peak loads? From this we get an average monthly bill of $177.90. Would love to see an article on which SCE Net Energy Metering program to pick with powerwall + solar installations.
Because of that, I chose not to change to TOU and kept the Tier plan. Assuming $0.08/kWh payment for exported energy, this solution would average on a monthly basis: This analysis based on the SCE average residential load profile shows that power arbitrage using energy storage is not economical without financial subsidies beyond the federal ITC anticipated here. All SCE solar customers must be on a TOU plan. If these are different from Tesla’s viewpoint it appears they represent a combination of applications. To have the system installed by March 1st, you’ll need to purchase by around mid-December. In most cases with solar, you are generating more electricity than you use in the middle of the day. Right now, Monday through Friday 2-8 PM are SCE’s peak hours. If our customer purchased 4.64 years of energy at daily tiered cost of $7.03, it would have cost $11,906. All Rights Reserved. SCE Rate Main features; TOU-D-4-9PM: On-peak rate of $0.37 from 4-9 PM on weekdays. Detailed load analysis will make decisions regarding energy storage and solar system sizing a straightforward economic analysis, rather than a guessing game. And the power that you sell to them in the middle of the day will now only be worth $0.22 per watt. For this example customer, the equations are: The cost per kWh from the batteries is calculated by dividing the battery installed cost (we’re using a common federally subsidized installation cost) by the lifetime discharge, which we determine by multiplying the annual kWh discharge by the estimated 4.64-year life of the battery. The Public Utilities Commission has approved SCE, and other major California utilities, to make a shift in the Time of Use (TOU) rate plans starting March of 2019. Here’s something that might help: https://www.solarpowerworldonline.com/2020/04/energy-storage-net-metering-an-illustration-of-why-its-so-valuable/. Throughput is defined as the energy moved through the battery during each roundtrip discharge/charge cycle. View the time periods for each TOU rate options. We’re taking a conservative approach to the analysis here, but I guess it depends on how you interpret it: Are Solar Self-consumption and Time-based Control a combination of applications? Sending a letter with your account information to SCE stating your intention to remain on your current tiered rate structure. Here are the choices from Southern California Edison. Hot Purple Energy Now a Tesla Powerwall Installer.
They will begin by forcing all new solar customers into the new rate schedule with the rest of …
To learn more about SCE’s new rate structure or for questions, call Hot Purple Energy (760) 322-4433 to speak to a representative. Right now, Monday through Friday 2-8 PM are SCE’s peak hours. 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. Once charged, we’ll set the Tesla Powerwall clock to disconnect the customer from the utility at 4 p.m. and remain disconnected until 9 p.m. during which time we’ll operate our loads using battery-supplied power, assuming the batteries can handle peak demand. Here’s how it works: Solar panels generate the most electricity for your house in the middle of the day.
For non-solar SCE customers, who already pay more for their energy, the numbers bear out a little differently. What is the battery throughput and $/kWh rate? Copyright © 2020 WTWH Media, LLC. We calculate our customer’s installed solar prior to batteries has a 25-year net present value (NPV) cost of $0.08/kWh of installed capacity. The data still points to a potential increase of 6% – 30% if they are in the D-4-9pm or TOU-D-5-8pm plan. The solar system size can, on average, charge the battery and cover daytime loads for our customer. The assumptions made on the Tesla Powerwall Warranty battery life are not accurate. Net Metering – As explained on SCE’s web site: “The energy you produce, minus the energy you consume, equals net energy. The customer can further improve their economics by changing their load profile (energy use patterns). Also shows your solar savings. IDS provides an IoT/cloud-based, distributed energy resource and load management solution designed to support multiple purposes and end users. TOU cost with Tesla Powerwall battery and power arbitrage. 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.
Now is the time to put a high efficiency SunPower system on your house and be grandfathered into the current rate structure for 5 years. Choosing your plan before SCE notification If you choose to opt-out of TOU before you receive your SCE notice (and you have that right), you can notify them of your decision by: 1. Browse the current issue and archived issues of Solar Power World in an easy-to-use, high-quality format. New Solar customers after March 1st of 2019 however, will be forced into the new Time-Of-Use rate plans meaning they will likely have to buy a battery to go with their solar system to offset “on peak” costs during the evening when the sun goes down and their solar production tapers off. Power arbitrage benefits utility operations.
The customer will have to decide whether they can expect useful life beyond the battery warranty and I would strongly suggest they get clarification from Tesla on their interpretation of the Warranty conditions.
Domestic (Default) TOU-D (A) TOU-D (B) TOU-D-T. Rate plans are complicated, and they tend to change every few months.
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. The change will affect the times in which SCE considers On-Peak and Off-Peak.
After March 1st, Edison will move new solar customers to a Time of Use Plan and change its peak period to 4 PM to 9 PM. Knowing how you use electricity will help you identify additional ways to save money on your electric rates. This coming March, Southern California Edison will be implementing a new rate structure for all new solar customers. 30% Solar Investment Tax Credit Coming To an End! In 12 months, our customer with solar-plus-storage will have saved $430.56. Southern California Edison is about to make a big change in the way it charges its customers, and it will have a huge effect on the economics of adding solar to their homes. They will begin by forcing all new solar customers into the new rate schedule with the rest of their customer base following suit in 2020. About Intelligent Design Solar While this large shift in TOU rates will have a negative impact on current solar value and slightly decrease the length of ROI, SCE is projecting a rate increase in which the cost of “off-peak” rates will likely go up in the next year and the cost of “on peak” rates will come down making solar more attractive than it may seem now. A 7-kW solar system without storage has a levelized 25-year installed cost of approximately $0.08/kWh. Our customer has an insignificant ($4.26/month) financial benefit from moving to a TOU rate structure, without investing in energy storage or changing usage patterns.
How long until return on investment (ROI) reaches breakeven?
I would say there really isn’t any difference between the two except for the source of energy charging the battery. Time of Use – On a Time of Use (TOU) rate plan, SCE charges you more for electricity at certain peak times during the day.
One Tesla Powerwall, at 13.2 kWh capacity, will cover evening use by discharging 82.7% of its stored energy.
Daytime usage: 8 a.m. – 4 p.m. = 10.726 kWh, Nighttime usage: 9 p.m. – 8 a.m. = 10.726 kWh, Self-supply during daylight of 342 kWh at 8-cents/kWh, Directly offset 33.2% of customer daily energy needs, Offset 60% of customer energy costs or $1,539/year, Attain a positive ROI in less than 8 years. SCE will have several TOU rate options: TOU-D Prime, TOU-D Option 4-9, and TOU-D Option 5-8. The equation is: Daily discharge rate multiplied by cost per kWh gives us our daily power cost from batteries. In our example, the residence receives service from SCE that offers residential 2-tier TOU rates, as shown in Figure 2. This article discusses the potential benefits for homeowners wanting to install grid-interactive solar-plus-storage operating under Southern California Edison’s new time-of-use (TOU) rates. SCE For Time of Use 2018 or SCE Time of Use rate comparisons, see Southern California Edison’s website.
This is not to say that the battery will no longer function out of warranty. Let’s assume our customer has the average load profile we found on the SCE website. However, under the new rate schedule, SCE has shifted the “on peak” time and the majority of solar production will now fall under “off-peak” hours and only be credited at $0.15 per kWh for overproduction (TOU-D-Prime). Solar policy differs across state lines and regions.
The Tesla solution at $5.85/day, costs $9,907.56 + $6,020 = $15,927.56.
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