PEV Submetering pilot data issues Nov/Dec 2015

 

Dear Pilot participant -

This page details the potential data issues with your submeter energy data that could affect your electrical bills for the months of November and December of 2015.

Quick summary:

  1. eMotorWerks server-side data processing software suffered an issue causing incorrect reporting of some charging data between October 26, 2015 and January 8, 2016

  2. We estimate that this issue could result in 16-24% of the EV charging load during that period to be billed as general house load for some customers

  3. We have sent a note to all submetering pilot customers in February 2016, offering reimbursement for any potential overbilling that resulted from this issue. If you believe your bill might have been affected, please send your electrical bills for 6 months from September 2015 to February 2016 to This email address is being protected from spambots. You need JavaScript enabled to view it..

Detailed description:

We have received the first complaints from our customers in the second half of December last year as the customers were reviewing their prior cycle bills. Across the 3-5 initial complaints in December, participants have generally reported apparent overbilling by $20-30 / month.

Towards the end of December, following Christmas holidays, eWM has launched an investigation into this issue. In the first week of January, we have tracked down the issue to the change in the behavior of our SQL server following our server migration on October 26, 2015. Net effect of this change was a 24-hour shift of a fraction of 15-min intervals - e.g., charging data for Tue 3:00-3:15am interval were reported as Wed 3:00-3:15am interval.

The issue was then addressed via server-side fixes on January 8 & 9, with thorough testing during the following week.

Billing impact was largely contained due to high degree of similarity of the charging load for all days of the same type (e.g., weekdays are similar to other weekdays and weekends - to other weekends):

  1. For Mon charging load (peaking 12am - 3am, reported as Tue load), no significant impact due to Tue actual load occurring at the same time of night and generally being higher than Mon load.

  2. For Tue-Fri charging loads (peaking 12am-3am, reported as Wed - Sat load), no significant impact due to very similar load patterns for these days with respect to the next day's load. We estimate the impact at the 10-15% level due to occasional mismatches

  3. For Sat charging load, there was no significant impact since Sat and Sun charging loads are quite similar, as well. We estimate the impact at the 10-15% level due to occasional mismatches

  4. However, any Sun daytime charging load (reported as Mon daytime load) most likely got rejected as bad data and the energy got booked into the house load instead. Fortunately, Sun charging loads are typically only ~7-10% of the weekly load so the impact was limited to that level

Therefore, our assessment of the total impact for affected customers is 10-15% of 90% of the charging load (Mon-Sat) plus 7-10% of the weekly load that fell on Sun, for the total impact of 16-24%.

UPDATE May 2016:
Since our email notification to all pilot participant, ~25 customers reported potential discrepancies in their bills for Nov / Dec 2015. For every such report, we have completed a thorough investigation using the customer billing data (provided by customers) and our archived second-by-second submetering data. The resulting reimbursements were calculated to average at $23.04 for the period of two months in Nov / Dec 2015.  

CUSTOMER INFORMATION SERVICE REQUEST FOR DRP (CISR-DRP)

IMPORTANT INFORMATION FOR CUSTOMERS AND THIRD-PARTY AGGREGATORS - BE SURE TO READ FIRST

THIS IS A LEGALLY BINDING CONTRACT - READ IT CAREFULLY

Pacific Gas and Electric Company’s (PG&E’s) Electric Rule 27 and its corresponding privacy policies, accessed at www.pge.com/about/company/privacy/customer, generally do not allow for the disclosure of your personal information, such as your name, address, phone number, or electric or gas Agreement and billing information, to third parties unless you expressly authorize us to do so. This form allows you to exercise your right to disclose your personal electricity-related information to up to two third-party Demand Response Providers (DRPs) so that you may obtain Demand Response services offered by DRP(s) pursuant to PG&E’s Electric Rule 24, which can be accessed at "www.pge.com/tariffs/tm2/pdf/ELEC_RULES_24.pdf. In some cases two different DRPs may work in concert to help a customer obtain Rule 24 Demand Response services. Accordingly, this form allows for disclosure of information about you to both a First DRP and an (optional) Second DRP. Alternatively, each DRP may submit their own CISR-DRP forms with your consent to receive personal information about you. Once you authorize access by the DRP(s) to your personal information, you are responsible for ensuring that the DRP(s) safeguards this information from further disclosure without your consent.

This form also grants the First DRP the ability to request that PG&E make limited changes to the PG&E electric meter(s) serving your Service Agreement(s), as specified in Section B below.

I, (Customer),

 
 
 
 

CUSTOMER INFORMATION SERVICE REQUEST FOR DRP (CISR-DRP)

IMPORTANT INFORMATION FOR CUSTOMERS AND THIRD-PARTY AGGREGATORS - BE SURE TO READ FIRST

THIS IS A LEGALLY BINDING CONTRACT - READ IT CAREFULLY

Southern California Edison’s (SCE’s) Rule 25 and its corresponding privacy policies, which can be found at https://www.sce.com/wps/portal/home/privacy/, generally do not allow for the disclosure of personal information about you, such as your name, address, phone number, or electric or gas account and billing information, to third parties unless you expressly authorize us to do so. The purpose of this form is to allow you, the customer, to exercise your right to disclose your personal electricity-related information to a third party Demand Response Provider (DRP) so that you may obtain Demand Response services offered by DRP(s) pursuant to SCE’s Rule 24, which can be accessed at https://www.sce.com/NR/sc3/tm2/pdf/Rule_24.pdf. In some cases two different DRPs may work in concert to help a customer obtain Rule 24 Demand Response services. In those cases, each DRP must submit their own CISR-DRP form with your consent to receive personal information about you. Once you authorize access by the DRP(s) to your personal information, you are responsible for ensuring that the DRP safeguards this information from further disclosure without your consent.

This form grants the DRP the ability to request that SCE make limited changes to the SCE electric meter(s) serving your Service Account(s), as specified in Section B below.

This form also authorizes the specified DRP to access your data to provide demand response services under Rule 24. If you intend to authorize the DRP or a different third party to receive additional billing records or billing information, and/or to act as your agent for purposes of making changes to your account and services with SCE, then you must complete the “Authorization To: Receive Customer Information or Act on a Customer’s Behalf” Form (Form 14-796), which can be accessed at SCE.com: www.sce.com/tariffbooks/.

I, (Customer),

 
 
 
 

CUSTOMER INFORMATION SERVICE REQUEST FOR DRP (CISR-DRP)

IMPORTANT INFORMATION FOR CUSTOMERS AND THIRD-PARTY AGGREGATORS - BE SURE TO READ FIRST

THIS IS A LEGALLY BINDING CONTRACT - READ IT CAREFULLY

San Diego Gas and Electric Company’s (SDG&E’s) Electric Rule 32 and its corresponding privacy policies, accessed at: http://www.sdge.com/our-company/privacy-policy, generally do not allow for the disclosure of your personal information, such as your name, address, phone number, or electric or gas account and billing information, to third parties unless you expressly authorize us to do so. This form allows you to exercise your right to disclose your personal electricity-related information to up to two third-party Demand Response Providers (DRPs) so that you may obtain Demand Response services offered by DRP(s) pursuant to SDG&E’s Electric Rule 32, which can be accessed at: http://regarchive.sdge.com/tm2/pdf/ELEC_ELEC-RULES_ERULE32.pdf. In some cases two different DRPs may work in concert to help a customer obtain Rule 32 Demand Response services. Accordingly, this form allows for disclosure of information about you to both a First DRP and an (optional) Second DRP. Alternatively, each DRP may submit their own CISR-DRP forms with your consent to receive personal information about you. Once you authorize access by the DRP(s) to your personal information, you are responsible for ensuring that the DRP(s) safeguards this information from further disclosure without your consent.

This form also grants the First DRP the ability to request that SDG&E make limited changes to the SDG&E electric meter(s) serving your Service Account(s), as specified in Section B below.

I, (Customer),

 
 
 
 

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eMotorWerks Inc. is a California based company which focuses on promoting high performance electric vehicle charging technologies, such as EV charging stations (EVSE), smart grid EV charging networks, and charging systems for high-voltage and DC fast charging.