About Intelligent Design Solar For non-solar SCE customers, who already pay more for their energy, the numbers bear out a little differently. In most cases with solar, you are generating more electricity than you use in the middle of the day. To have the system installed by March 1st, you’ll need to purchase by around mid-December. Those that already have solar are automatically grandfathered into their original rate structure whether it be their original TOU (5 years) or Tiered billing (20 years). To calculate the length of the warranty period we multiply our daily discharge by 365 to determine annual kWh discharge then divide half of 37,000 kWh by that number. The Tesla solution at $5.85/day, costs $9,907.56 + $6,020 = $15,927.56. After March 1st, the hours change to 4 PM to 9PM. On TOU rates without energy storage, we see a daily cost of $6.89, or an average monthly bill of $209.52. Tesla could then argue the 37 MWh throughput condition applies. The assumptions made on the Tesla Powerwall Warranty battery life are not accurate. 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. And the power that you sell to them in the middle of the day will now only be worth $0.22 per watt. For a customer with solar, then the DR-SES plan will be the best because it moves peak hours into the daytime such that more of your excess solar power during the day will attract a … In our example, the residence receives service from SCE that offers residential 2-tier TOU rates, as shown in Figure 2. The equation is: Recharge is at the solar avoided cost of $0.08/kWh. Solar customers generate energy, sell it to the utility, and make the highest amount of money that the utility offers. Bookmark, share and interact with the leading solar construction magazine today. 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. Would love to see an article on which SCE Net Energy Metering program to pick with powerwall + solar installations. Solar policy differs across state lines and regions. Right now, the most expensive electricity Edison will sell is at $0.47 per watt between 2 PM and 8 PM. Here are the choices from Southern California Edison. 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. Tier 1 is .19. Also, watch this video on Time of Use. All Rights Reserved. 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. You sell a lot of that excess electricity back to Edison at $0.47 per watt. 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. In this instance, the customer gets the best economic results by simply switching to TOU rates. SCE’s justification for doing this is that the cost to deliver power has changed. What is our energy storage lifetime cost/benefit? Since solar has boomed and has become a large source of energy on the grid, SCE has shifted their higher charges to the times where solar wanes and non-renewable forms of energy become the main source of power for the grid. If our customer purchased 4.64 years of energy at daily tiered cost of $7.03, it would have cost $11,906. It’s only a measurement used in evaluating the investment for Arbitrage use. The solar system size can, on average, charge the battery and cover daytime loads for our customer. *We never share your information with other vendors or solar companies. This delivers a benefit of $35.88/month, which amounts to a 16.8% decrease in energy cost over the tiered rate cost and a 15.1% decrease from TOU rates with no arbitrage. To compare TOU current residential rates and new rates, go to – Time-Of-Use-Residential-Rate-Plans. In 12 months, our customer with solar-plus-storage will have saved $430.56. Browse the current issue and archived issues of Solar Power World in an easy-to-use, high-quality format. New Rate . Evans says.“If you don’t want solar and SCE switches you … Thankfully with solar prices coming down and with energy storage as an option, solar remains a good investment. 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. Our goal is to charge our customer’s Tesla Powerwall mid-day between 8 a.m. and 4 p.m. while rates are 13-cents/kWh and solar production is at its highest. To determine the cost of energy from the battery in $/kWh we need to analyze energy throughput. Results will vary significantly based on the personal load profile and the daily load size. SC Edison to Increase Electric Rates by 14%, What You Should Know About the New CCA | Desert Community Energy. The equation is: Daily discharge rate multiplied by cost per kWh gives us our daily power cost from batteries. 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. 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. 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. Or, use their rate comparison tool. 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. Tesla states that its warranty under arbitrage-use conditions is based on 37 MWh of battery throughput. Since this recharge power is energy we would otherwise export, we need to include it in the cost of battery energy. SCE Peak Hours. The change will affect the times in which SCE considers On-Peak and Off-Peak. That’s great for solar customers, because those are hours when your solar panels producing the most, and it’s a time when a lot of people aren’t home. Right now, Monday through Friday 2-8 PM are SCE’s peak hours. IDS provides an IoT/cloud-based, distributed energy resource and load management solution designed to support multiple purposes and end users. Use in the customer load profile more for their energy, sell it to utility... Sce website by TOU rate plans, rates will vary depending on each unique customer s. Overproduce, they also buy that power at a higher rate. ) Community energy, solar remains a investment... 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