South or West for TOU (quantified) [RE-wrenches]

[William Korthof]

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>Next point is, as I have said many times, TOU is a double-edged sword. Even
>with your best scenario, the overall value of the PV is only $0.185/kWh.

In So Cal, the summer on-peak rates with Southern California Edison
are $0.42 and $0.52/kWh for TOU-D1 and TOU-D2, 10 AM to 6 PM,
Monday-Friday. That's a HUGE  premium over the ~$0.11-$0.16/kWh
off-peak prices. But I think the SCE TOU rate structure may be the most
advantageous (for PV) in the country.

>This is potentially less value than a customer that consumes 1000 kWh a
>month and is on the tiered rate system. The tiered rate system is very
>attractive for large users with PV systems that provide half of their
>energy. TOU makes more sense for the energy conserving household. The other
>side of the sword is that if you have air conditioning and live at home
>during the day, it is almost impossible for TOU to be better than the tiered
>system for PV.

I'm not sure that I agree... unless the customer uses trivial energy during
the off peak (mostly non-solar) periods, TOU usually seems to yield a
significant benefit (in our area).

>It is not a simple answer for these questions, and the TOU rate structure
>potentially exposes the contractor to billing disputes with their customers.

Definitely! That's one area where I would advise strong caution.

/wk

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