ElectricMonkey
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SDG&E, Solar, Net Metering, and Time of Use 2 (TOU2)

Thu Aug 28, 2014 12:51 pm

On the advice of a friend who also has solar and an EV, we switched to the TOU2 plan. We had a positive usage of 90kWh for the billing period that just ended, and yet we still had a negative bill. No more tiers! I was told, specifically, by SDG&E that on TOU2, you are credited at the rate of electricity when you generate, and billed at the rate of electricity when you use. It's that simple, and that does, in fact, appear to be the case. I've seen plenty of forum posts, across multiple forums, debating the topic, so I thought I'd chime in. We appear to have been credited at $0.49 per kWh during on peak (12-6pm) while we're generating power, and billed at $0.16 super off peak, and $.22 off peak, for the hours when we're using electricity. We can use more than we produce, and still have a negative bill. It's also worth mentioning that we have a Jacuzzi, and that the timer on the Jacuzzi sets itself based on when it is powered on, so we powered it on during the cheaper rate period, and programmed it's cycles accordingly.

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drees
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Re: SDG&E, Solar, Net Metering, and Time of Use 2 (TOU2)

Thu Aug 28, 2014 12:57 pm

Yeah, I need to do the same thing.

EV-TOU2 seems to be slightly better than going DR-SES since it covers weekends and holidays, despite DR-SES starting peak hours at 11am instead of 12pm.

And the EV-TOU2 super off peak rates are a decent amount cheaper, too.

How did you switch? Did you have an existing EV-TOU meter?
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Randy
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Re: SDG&E, Solar, Net Metering, and Time of Use 2 (TOU2)

Thu Aug 28, 2014 1:11 pm

You can switch to an EV rate such as EV-TOU2 by going to the EV page on the SDG&E website: http://www.sdge.com/ev and then click on the "Change to EV rate" on the left side and fill out the form...

It is true that you are credited with the retail TOU price for energy generated during the day and then you will be billed at the TOU price for energy consumed in the various time periods. A true up occurs each year, so from month to month you can carry surpluses or deficits over.

At the end of the annual true up period, your account will be settled up. If you use more than you generate, an amount will be due. if you end up with excess generation, then you will be paid back at a wholesale rate. So it is to your advantage to not over generate too much.

Gas is usually billed separately, so excess generation cannot be applied to gas purchases.

I installed solar recently and am finding that the EV-TOU2 rate works very well for me. There is a triple-whammy (tm) financial multiplication effect of generating during the day on peak during the summer and charging cars at night during super off peak that is very nice....And while there is a financial benefit to the customer for doing that, there is also a benefit to the utility and other ratepayers because charging cars late at night avoids additional infrastructure investment (so everyone saves longterm)...

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drees
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Re: SDG&E, Solar, Net Metering, and Time of Use 2 (TOU2)

Thu Aug 28, 2014 1:43 pm

Thanks Randy!

Do you have to wait until your true-up period to switch, or can you switch at any time? If I switch now, does that mean I lose any credits I have built up over the sunny months?
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Randy
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Re: SDG&E, Solar, Net Metering, and Time of Use 2 (TOU2)

Thu Aug 28, 2014 2:38 pm

Just checked for you, and a true up is not forced if you do a rate change in the middle of a cycle. The true up date stays the same.

Also clarified what happens at true-up time. During the year, a running total is shown on your statement that is a negative number (for retail pricing credits) or a positive number (for usage above and beyond generation). At the end of the year when your true up occurs, if you are an over generator, then the retail credit balance for the year is converted to the wholesale price. You can either get a check for that wholesale price at the end of the annual true up period or roll that wholesale price over as a credit to the next year (not the retail version of that credit you might have been seeing build up on your monthly statements).

I hope that helps clarify as I know it can get confusing....

ElectricMonkey
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Re: SDG&E, Solar, Net Metering, and Time of Use 2 (TOU2)

Thu Aug 28, 2014 2:50 pm

TOU 2 means you have the car and the house on the same meter, while TOU means you have a separate meter for the car. Its ambiguous because the '2' might just as easily mean that you have 2 meters, rather than two things using a single meter (house and EV).

We have only one meter, and that's what makes it really good for us because all of our usage is now based on time of day, and, unless our dogs figure out how to turn on the AC when we're gone, there's really nothing running in our house during peak hours. We even have a delay feature on our washing machine so we can run it during super off peak.

Now, if I can just figure out how to run the car charger backwards and feed the grid during the day on the weekends, I'll be all set :twisted:

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Randy
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Re: SDG&E, Solar, Net Metering, and Time of Use 2 (TOU2)

Thu Aug 28, 2014 3:02 pm

For customers with a solar PV system and an EV, it makes the most sense to have the whole house meter setup. If you did have two meters, then your solar output would probably be tied to your house meter and your car usage would then be separate and not offset by solar generation on the other meter. So you lose that benefit.

The EVTOU separate meter rate is best for people that have significant peak usage that they want to keep separate on the tiered DR rate and then get the TOU rate on the second meter to charge their car. That way, the car charging doesn't make them go into a higher tier if they just had one meter, and the house peak time usage is measured on the tiered rate and not charged at peak time. But this scenario doesn't happen very often...Most people with EVs are better off on EVTOU2 whole house metering...

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Re: SDG&E, Solar, Net Metering, and Time of Use 2 (TOU2)

Thu Aug 28, 2014 3:07 pm

The way TOU works out I find it amazing that there is so much resistance on plain net metering.
Huge benefit to supplying on-peak power and shifting usage to the early morning.
My bill reduction (SCE) is at least double what it would be with flat rate net metering.
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drees
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Re: SDG&E, Solar, Net Metering, and Time of Use 2 (TOU2)

Thu Aug 28, 2014 4:22 pm

Randy wrote:Just checked for you, and a true up is not forced if you do a rate change in the middle of a cycle. The true up date stays the same.

Cool, thanks again!

Randy wrote:Also clarified what happens at true-up time. During the year, a running total is shown on your statement that is a negative number (for retail pricing credits) or a positive number (for usage above and beyond generation). At the end of the year when your true up occurs, if you are an over generator, then the retail credit balance for the year is converted to the wholesale price. You can either get a check for that wholesale price at the end of the annual true up period or roll that wholesale price over as a credit to the next year (not the retail version of that credit you might have been seeing build up on your monthly statements).

I hope that helps clarify as I know it can get confusing....

Yeah, it is a bit confusing. But looking at my NEM Summary it makes sense. I currently have a NEM credit of about $30, so if I switch now I'll simply use up those credits in the winter months. And it's possible I'll build up more credits, but now they're likely to be at $0.49 / kWh instead of $0.16 / kWh.

Submitting the application now!

PS - do you know what happens to the current EV meter?

Edit: Called up and spoke with an EV specialist, the current EV meter will remain in place, it just won't be used any longer.
Last edited by drees on Thu Aug 28, 2014 5:07 pm, edited 1 time in total.
Reason: Add note.
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Randy
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Re: SDG&E, Solar, Net Metering, and Time of Use 2 (TOU2)

Thu Aug 28, 2014 5:43 pm

We always encourage people with the 2nd ev meter who are migrating to the whole house rate to leave it in place if possible and we will make it a load research meter. Nothing will ever get billed from it, but it will still gather valuable charging data. You also have the choice of removing it if you'd like...

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