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California Solar "Savings" and Time-of-Use Metering

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Walt Bilofsky

Jan 1, 1970
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I'm looking at getting PV for my house, and got some estimates that
show how much money I'll save on my electric bill.

Well, I worked up my own spreadsheet, and while plugging in various
alternatives, I noticed something funny. Installing zero watts of
solar still saves me over 25%.

This savings comes from PG&E's time of use metering. Of course, all
the projections credit PV for them instead.

Am I missing something here? Have others done the same projection?
(My annual consumption is around 7000 KWh, so the tiered rates raise
my bill. Time of use doesn't use the tiers.)

- Walt Bilofsky
 
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Walt Bilofsky

Jan 1, 1970
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steve said:
sounds like a broken spreadsheet...
Well, I don't think so, but that's what I'm trying to find out.

No question, if I put in PV and time of use, it will save money.
That's why I'm looking into it.

But I would sure like to hear from someone who has evaluated time of
use metering as a separate factor.
 
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Anthony Matonak

Jan 1, 1970
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Mark wrote:
....
time of usage + solar MAY save you even more money, you have to figure
out the payback

Alas, here in LADWP land they do not allow you to do both time of
usage and net billing at the same time.

Anthony
 
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Walt Bilofsky

Jan 1, 1970
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Well, you were right - the spreadsheet was broke. Or rather my model
was - I wasn't taking the tiered structure into account. (My vendor's
spreadsheet didn't use tiers so I assumed there weren't any.)

It looks like I would still save something, but about 10%, not 25%.
 
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