TOU for SCE in Southern California analysis

[sensij]

I was looking at the CA TOU B. Am I interpreting this correctly? The nighttime rate is 11 cents and the baseline is 10 cents, so power used in that tier is actually only 1 cent?

Correct... if all your power consumed was in the super-off peak, and the amount you consumed is less than your baseline allocation (but greater than zero), you would be paying $0.01 / kWh for that power. Same for TOU-D-A. Note the large monthly fee for B ($16/mo), vs A ($0.93 / mo).

Just another reason why sizing to produce 100% of consumption is not optimal.

[gvl]

I was looking at the CA TOU B. Am I interpreting this correctly? The nighttime rate is 11 cents and the baseline is 10 cents, so power used in that tier is actually only 1 cent?

If all your baseline usage (monthly export minus consumption) is during super-off-peak then yes, up to your baseline. But then you might be better off on TOU-A which has no monthly fee (correction: $0.93 fee), especially if you can limit usage during the day and "sell" back to SCE at a higher rate.

[gvl]

Just another reason why sizing to produce 100% of consumption is not optimal.

At this time at least...

[sensij]

At this time at least...

If you follow the CPUC proceedings, you will see that including a baseline credit or allocation will become a standard feature of TOU plans for all of the IOU's going forward. SCE is actually ahead of the curve on this one.

[gvl]

If you follow the CPUC proceedings, you will see that including a baseline credit or allocation will become a standard feature of TOU plans for all of the IOU's going forward. SCE is actually ahead of the curve on this one.

I was implying that we don't know the future TOU rates. As one extreme example if everyone installs solar the super-off peak may actually shift to daytime

[lkruper]

If all your baseline usage (monthly export minus consumption) is during super-off-peak then yes, up to your baseline. But then you might be better off on TOU-A which has no monthly fee (correction: $0.93 fee), especially if you can limit usage during the day and "sell" back to SCE at a higher rate.

The map lists regions (eg 10,12,16). Do these numbers directly correspond to the baseline in kWH?

[sensij]

The map lists regions (eg 10,12,16). Do these numbers directly correspond to the baseline in kWH?

You can use those region codes to look up the baseline allocation in this document. For example, region 10 has a summer baseline of 15.5 kWh per day, and 11.0 kWh / day in winter.

[sensij]

I was implying that we don't know the future TOU rates. As one extreme example if everyone installs solar the super-off peak may actually shift to daytime

OK, but as long as we know some baseline quantity of energy is less expensive than the rest, there will always be a case that sizing less than 100% is more cost effective. A baseline system is the currently favored system for developing rates, whether straight tiered or TOU, and that doesn't appear to be changing in the foreseeable future.

[silversaver]

The TOU-D-A so far so good that really benefits the solar arrays facing from South to West. I have consume 2000+kWh with withdraw 1000kWh from SCE after solar production, the bill aint so bad after all.

[silversaver]

The SCE min charge is filled on Sept 1st and effective on Oct 1st of 2015. The actual charge might/will show up on any billing cycle start after Oct 1st. So far my recent bill closed on Oct 13th doesn't show any min charge so I will assume the charge will show on next bill.

[silversaver]

SCE new rates effective 10/01/2015

https://www.sce.com/wps/portal/home/residential/rates/residential-plan/!ut/p/b1/jZDdTsMwDEafqLXbwlIuM7R2qTZK6cRKblAGaRYpS6osohJPTybtCokf31k6_nxs4DAAt-JDKxG0s8Jcer54zcqarlmPrH68vUHWkB0S0mdlRSLwEgH8oSj-Nd_8Y0Hut_dbBXwS4ZhoOzoYvDzrd2mDFiaZjLCwB_4t6YnkMel5tWmXWY5lfgXualytmzYCu65AVnT40FNaIC6uwC-3RFll3CH-Zb8E3loaqu4iSO2hKKOgl6P00qdHdw4wzPOcKueUkembO8F0Gj43Y88SXqkvX-jcpA!!/dl4/d5/L2dBISEvZ0FBIS9nQSEh/

[sensij]

The SCE min charge is filled on Sept 1st and effective on Oct 1st of 2015. The actual charge might/will show up on any billing cycle start after Oct 1st. So far my recent bill closed on Oct 13th doesn't show any min charge so I will assume the charge will show on next bill.

FWIW, in SDG&E land, the tariff takes effect on the day it is filed. My Sept. statement showed a $8.92 min charge, consistent with a 30 day billing period that had 6 days in August @ $0.17 / day + 24 days in September @ $0.329 / day.

[silversaver]

I'm in 11 month of relevant period. Looks like I'll be drawing about 4000kWh from SCE before end of relevant period on Dec 12, 2015. If I stay in standard tier rate, my bill will be pretty high. The TOU has really making my solar worth of the money + 2 EVs 26000 total annual miles.

[tweekzilla]

I'm still confused a little by the negative credit if you produce more than you use. Do you actually have to pay this money to SCE or does it just offset any possible credit you may already have received that year if you use more than you produce?

[silversaver]

I'm still confused a little by the negative credit if you produce more than you use. Do you actually have to pay this money to SCE or does it just offset any possible credit you may already have received that year if you use more than you produce?

the negative credit will be reset to $0 at end of relevant period (12 months) and your starting a new period.