Hello from Poway CA

[J.P.M.]

Thanks for your insight into the mysteries of SDG&E's NEM 2.0 billing. If I take off the NBC rate and add in the State Surcharge Tax ($.000300 per kWh) and the State Regulatory Fee ($.000580 per kWh) I now can get within a penny, if not exactly on, the amount SDG&E calculates for my NEM charges and Applied Credits. My final results are closest if I add up the 15min interval data and then round the NBC kWh values to the nearest whole number.

I can now quit agonizing over the details of SDG&E's billing details.

You're most welcome.

Welcome to the joys of dealing with POCO (non)cooperation and transparency. You have just scratched the surface.

[RichardCullip]

Thank you.

FWIW: As for the difference between the applied credit and the sum of other terms, I believe the generation credit/kWh is reduced by the NBC.

$0.3540 - $0.3319 = $0.0221.

The current NBC rate effective 08/01/2019 is $0.02341/kWh, or $1.966 for 84 kWh.

($0.02341- $0.0221) * 84 = $0.11 difference. Depending on where you live in SDG & E's service area, there is often some small tax consideration(s) that may apply (or not, or partially) to the NBC. I suspect that's where the remaining $0.11 might be.

To my experience, there is also often some small rounding by SDG & E that looks to me to come from getting usage and net generation in 15 minute increments and billing in whole kWh, but I don't claim to be knowledgeable about how they do it and so far they haven't graced me withy any I sight in such matters.

Thanks for your insight into the mysteries of SDG&E's NEM 2.0 billing. If I take off the NBC rate and add in the State Surcharge Tax ($.000300 per kWh) and the State Regulatory Fee ($.000580 per kWh) I now can get within a penny, if not exactly on, the amount SDG&E calculates for my NEM charges and Applied Credits. My final results are closest if I add up the 15min interval data and then round the NBC kWh values to the nearest whole number.

I can now quit agonizing over the details of SDG&E's billing details.

[J.P.M.]

Applied Credits. Specifically I'm wondering why the Applied Credit is slightly less than the sum of the Electricity Delivery, DWR Bond, Electricity Generation Charges and the Baseline Adjustment Credit. I'm on the TOU-DR schedule under NEM 2.0 since I just got the PTO back in April of this year. As an example my bill in August was for 84 kWh of On-Peak use. The kWh for the Off-Peak and Super Off-Peak periods were negative as I'm currently generating more than I'm using for those TOU periods. For the 84 kWh of On-Peak demand I was charged $19.87 for Delivery, $0.42 for DWR Bond, $18.19 for Generation with a Baseline Adjustment Credit of -8.74. The sum of these is $29.74. However, SDG&E only gave me a Generation Credit of -$27.88. In summary I was charged $0.3540 per kWh for the 84 kWh and SDG&E only applied a generation credit of $0.3319 per kWh. I'm curious why SDG&E did not apply enough generation credit to cover the cost of those 84kWh. I had more than enough generation credits to cover the full amount. There's something I don't quite understand about the pricing that SDG&E uses to come up with that $0.3319 per kWh of Applied Generation Credit. My confusion can also be applied to the NEM credits listed in the table at the bottom of the bill as the NEM credits is exactly the same value as the Applied Credits. August is not unique. Each month since PTO shows the same pattern.

Thank you.

FWIW: As for the difference between the applied credit and the sum of other terms, I believe the generation credit/kWh is reduced by the NBC.

$0.3540 - $0.3319 = $0.0221.

The current NBC rate effective 08/01/2019 is $0.02341/kWh, or $1.966 for 84 kWh.

($0.02341- $0.0221) * 84 = $0.11 difference. Depending on where you live in SDG & E's service area, there is often some small tax consideration(s) that may apply (or not, or partially) to the NBC. I suspect that's where the remaining $0.11 might be.

To my experience, there is also often some small rounding by SDG & E that looks to me to come from getting usage and net generation in 15 minute increments and billing in whole kWh, but I don't claim to be knowledgeable about how they do it and so far they haven't graced me withy any I sight in such matters.

[RichardCullip]

I am not familiar with the format of a SDG&E bill but the lack of clarity may be similar to what I and others have seen on PG&E bills. That lack of clarity may be a result of Non Bypassable Charges and how they affect cumulative totals. The only insight I can offer is that there are two buckets of accumulated NEM balances that will be taken into account at True Up. They are NBC charges and other NEM charges.

Like PG&E the SDG&E bill does makes it difficult to follow the nitty gritty details of their charges. By working with the 15 min interval usage data downloaded from SDG&E website I can duplicate all of the bill components except for the price per kWh used in the NEM Charges and the Applied Credits. For my current situation it's more of an intellectual curiosity since my SDG&E bills total up to the monthly minimum charge and it doesn't really matter how SDG&E breaks that down into individual bill components.. That being said, I'm a detailed spreadsheet guy who has a hard time sleeping when numbers and formulas don't quite add up.

[Ampster]

I am not familiar with the format of a SDG&E bill but the lack of clarity may be similar to what I and others have seen on PG&E bills. That lack of clarity may be a result of Non Bypassable Charges and how they affect cumulative totals. The only insight I can offer is that there are two buckets of accumulated NEM balances that will be taken into account at True Up. They are NBC charges and other NEM charges.

[RichardCullip]

Are you referring to the columns with headings "NEM credits", "Applied Credits" and "remaining credits" ?

Applied Credits. Specifically I'm wondering why the Applied Credit is slightly less than the sum of the Electricity Delivery, DWR Bond, Electricity Generation Charges and the Baseline Adjustment Credit. I'm on the TOU-DR schedule under NEM 2.0 since I just got the PTO back in April of this year. As an example my bill in August was for 84 kWh of On-Peak use. The kWh for the Off-Peak and Super Off-Peak periods were negative as I'm currently generating more than I'm using for those TOU periods. For the 84 kWh of On-Peak demand I was charged $19.87 for Delivery, $0.42 for DWR Bond, $18.19 for Generation with a Baseline Adjustment Credit of -8.74. The sum of these is $29.74. However, SDG&E only gave me a Generation Credit of -$27.88. In summary I was charged $0.3540 per kWh for the 84 kWh and SDG&E only applied a generation credit of $0.3319 per kWh. I'm curious why SDG&E did not apply enough generation credit to cover the cost of those 84kWh. I had more than enough generation credits to cover the full amount. There's something I don't quite understand about the pricing that SDG&E uses to come up with that $0.3319 per kWh of Applied Generation Credit. My confusion can also be applied to the NEM credits listed in the table at the bottom of the bill as the NEM credits is exactly the same value as the Applied Credits. August is not unique. Each month since PTO shows the same pattern.

[J.P.M.]

Are you referring to the columns with headings "NEM credits", "Applied Credits" and "remaining credits" ?

[SunEagle]

Hello Richard and welcome to Solar Panel Talk

[RichardCullip]

Hello all. New member here. I'm here to glean information, especially about the nitty gritty details of SDG&E billing. I got the PTO from SDG&E in April of 2019 and have figured out most of the billing detail including the NBC and Minimum Monthly Adjustment charges. I'm still a bit confused about the Generation Credit that is applied each month. My system is 12 LG335 panels with a SolarEdge inverter. My roof is south orientated with no shading. I am very pleased with the production so far as it is running about 15% above the forecasted performance provided in the bid. San Diego County Solar was fantastic to work with from initial conversations all the way thru getting PTO from SDG&E. No glitches along the way. So far I'm a very happy solar customer.