NREL’s free SAM tool can model tiered & TOU rates with PV generation: https://sam.nrel.gov/
It’s a little clunky to use on every project, but everything can be exported to spreadsheets to dial it in further/work outside of the tool. Consumption data can also be input into the tool. -- *Phil Boutelle,* *PE, CEM, NABCEP Emeritus* | Energy Engineer philboute...@gmail.com | M (831) 359-5268 On Mon, May 3, 2021 at 7:42 PM William Miller <will...@millersolar.com> wrote: > Rebekah: > > > > Well I spent way too much time thinking about and trying to model these > PG&E rates in Excel. Here is what I came up with: > > > > > > The higher the value, the better the rate plan for selling energy. As you > can see, there is not much difference between all of these options. About > a week ago I wrote all of my clients and warned them not to let the big, > bad PG&E force them into new rates, based on a cursory look at the > tariffs. Now I feel obligated to write all of them again to clarify that, > as far as I can tell, it doesn’t make all that much difference. It’s a > little embarrassing. > > > > This chart does not take into account the effects of consumption. Unless > you have an energy monitor, you have no way of factoring in consumption. I > happen to have an energy monitor <http://egauge15947.egaug.es/58C32/> and > when I looked at the data it provide, it showed that the E-1 rate I have > did offset my consumption efficiently. PG&E has an online rate comparison > tool and it too indicated that E-1 is best for our home. Of course you > can’t use E-1 unless you are grandfathered and opted out of the rate change. > > > > The table above is based on my best efforts to build a spreadsheet for > each of these rate structures that models them accurately. I can’t promise > I got it all correct, but I surely tried. Modeling these rate plans is a > bit of a mind-bender due to the number of variables each of these rates > incorporates and then trying to keep them all straight in my head. For my > limited resources this was some heavy mental gymnastics. > > > > I want to thank Antony Tersol for the illumination he provided on how to > plug the baseline rates into the TOU modeling. > > > > I will collate the info I have on this subject and put it on the Case > Studies section of our web site later tonight if anyone is curious. I will > include the spreadsheets. Any feedback is welcome. > > > > Thanks everyone for the interest and input. > > > > William Miller > > > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > > CA Lic. 773985 > > > > > > *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On > Behalf Of *Rebekah Hren > *Sent:* Monday, May 3, 2021 7:02 AM > *To:* offgridso...@sti.net; RE-wrenches > *Subject:* Re: [RE-wrenches] Utitlity Rate question > > > > Hi William, > > Thanks for posting the links to your studies. With CA NEM. 2.0 customers > forced into TOU rate schedule, I have been wondering if you have done an > analysis on whether TOU-C (peak 4-9 everyday) or TOU-D (peak 5-8 weekdays) > is a better pair with solar? > > > > > https://www.pge.com/pge_global/common/pdfs/rate-plans/how-rates-work/Residential-Rates-Plan-Pricing.pdf > > > > I am leaning towards TOU-D but haven't done an in-depth analysis. Clearly > there isn't going to be much solar generation during peak hours regardless. > > > > Thanks! > > Rebekah > > Tel: 336.266.8800 > > > > > > On Sun, May 2, 2021 at 9:54 AM Dave Angelini Offgrid Solar < > offgridso...@sti.net> wrote: > > You guy's all know that utility is not going to get easier to understand. > It is going the other way and has been! Some of the AG solar guy's below me > in the greatest growing region in the world are probably the best. I can > dig up some of their names from the AG shows on radio KMJ in Fresno. The 5 > am AG show has alot of solar on it and you can stream it. > > I am away for a few days but will post something when I get back. Here is > a link to KMJ and to the AG solar company. > > https://www.kmjnow.com/on-air-schedule/ > > https://pickettsolar.com/industries/agribusiness/ > > > > *Dave Angelini Offgrid Solar* > > *"we go where powerlines don't"* > > *http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/>* > > *e-mail offgridso...@sti.net <offgridso...@sti.net>* > > *text 209 813 0060* > > On Sun, 2 May 2021 07:15:55 -0700, frenergy <frene...@psln.com> wrote: > > Jerry, > > That's the easy answer but this all gets really deep into > weeds as unless you're a PG&E smart meter (and we *really* trust them), > you don't know when that E-6 baseline is crossed to know when you're > getting or paying the higher rate. There's 2 things going on, baseline and > time-of-use. Customer usage, cloudy days plus other variables make a > precise calculation impossible. A customer might enter the > higher-than-baseline rate halfway into the month and then low consumption > and sunny days pulls the customer back below baseline, paying the lower > rate. > > So many headaches, William, I've tried to figure all this out > on paper but have relied more on raw experience of what works to zero-out > one's bill which with E6 can easily happen with less KWhrs produced than > consumed. > > I would love to talk to wrenches who can help me with decent > rates for AG pumping and the AG-solar destroyer: demand charges. > > Bill > > Feather River Solar Electric > > Bill Battagin, Owner > > 4291 Nelson St. > <https://www.google.com/maps/search/4291+Nelson+St.+Taylorsville,+CA+95983?entry=gmail&source=g> > > Taylorsville, CA 95983 > <https://www.google.com/maps/search/4291+Nelson+St.+Taylorsville,+CA+95983?entry=gmail&source=g> > > 530.284.7849 > > CA Lic 874049 > > www.frenergy.net > > On 5/1/2021 3:16 PM, Jerry Shafer wrote: > > Wrenches > > Currently with PG&E , you buy and sell at what ever rate you are on, Peak > = peak, off peak =off peak, > > > > On Sat, May 1, 2021, 3:02 PM William Miller <will...@millersolar.com> > wrote: > > Friends: > > > > After years of not quite understanding the intricacies of the newer, more > complicated utility rate schedules I have spent the last 72 hours diving > deeply into the rabbit hole. I have one question I need answered. Maybe > someone has the answer. > > > > If you are on a tiered electric utility rate I know you pay more for > energy after you exceed certain daily amounts—the baseline. I am clear > that if you avoid paying the higher rates, the value of the energy you > generate is equal to the money you save. However if you ratchet your daily > usage below zero and are net-exporting for part of a day, at what value are > you credited in an NEM contract? > > > > Is it: You get the baseline rate no matter how much energy you export. > > > > Or is it: After you export more than the baseline rate, you start getting > credited at the over-baseline rate. > > > > Or is it something different altogether. > > > > If anyone knows the answer to this arcane question I would be very > grateful to learn it. It may vary from utility to utility or plan to > plan. PG&E E-6 is the tiered rate I most commonly encounter. > > > > If any of you are particularly masochistic you can review some work I have > published on the subject here: > > > https://millersolar.com/MillerSolar/case_studies/28_UtilityRates/UtilityRates.html > > > > This is an intricate subject and I believe anyone working in grid-tied > solar should have at least a passing familiarity with the topic. It > affects the realized benefits of investing in grid-tied solar. > > > > Thanks again for being the great group of friends that you are. > > > > William Miller > > > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > > CA Lic. 773985 > > On 5/1/2021 12:46 PM, William Miller wrote: > > > > > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > > Virus-free. www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=link> > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
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