[RE-wrenches] GT with batteries in Calif.

[Bruce Erickson]

I emailed Brad Heavner, the policy director at CALSEIA, today and got this response in part (I omitted his expression of exasperation):

" . . . PG&E’s storage interconnection manager, Bennett Chabot, was on a panel with me two weeks ago and he assured people that PG&E staff should be up to speed by now. He pointed people to the EGI webpage at http://www.pge.com/en/b2b/energytransmissionstorage/egi/grid/index.page. He also encouraged people to email rule21gen at pge.com if they have problems. They are required to respond to inquiries within a week. "

I followed the link and spent a fruitless half hour on PG&E's website, including using the search bar and every search term I could think of. I found nothing about NEM with storage. Maybe someone else has better search skills than me.

So I emailed the rule21 folks. Possibly someone who knows something will contact me within a week.


Bruce Erickson
Mendocino Solar Service
PO Box 1252
Mendocino, CA 95460
707-937-1701
707-937-1741 fax
bruce at mendocinosolar.com

Celebrating 20 Years in Solar! 1994-2014





On Jul 2, 2014, at 5:46 PM, Christopher Warfel wrote:

> I think so. Bruce's post indicated that 10kW seemed incorrect. So assuming a 10 kW inverter exporting for the onpeak period over an unknown assumed number of days assuming no recharge from the utility?  I know this has a lot of different ways of being looked at, which is why the atakeholders need to look at this.  At this point, it seems like the optimal solution is complicated from a metering and accounting perspective. They don't want off peak consumption being used to sell on peak. Starting from there, how do they acheive this from an implementable policy perspective?  
> 
> 
> ------- Original Message ------- On 7/3/2014 12:28 AM wrote:
> " In any case, a 10 kW battery system, will probably exceed most grid connected battery systems, and the whole issue is moot. "
> 
> shouldnt battery capacity be in kWh?
> 
>  
> todd
> 
>  
>  < /p>
> 
>  
>  
> On Wednesday, July 2, 2014 5:00pm, "Christopher Warfel" said:
> 
> I am not familiar with PGE's time of use rates for residential. I have to assume that they do have TOU built into their metering. Buying at any time is predicated by the load of the facility, including battery load, so this is probably their concern. Given the costs of batteries it seems uneconomical to buy batteries just to store energy to sell on peak, but I don't have your peak vs off peak tariff.  We have been putting in two meters on our systems, but to make it work properly for determining actual PV generation we had to put a detent in the meter on the back up panel circuit. Now the only way I think that this can be done by utility type meters is to buy a programmable meter and have it record input and output similar to how the utility meter operates. 
> 
> If they will accept a DAS system (and some are now compliant with uti lity accuracy requirements, place a product such as EGauge on the battery back up circuit. If you are exporting at a time with n o or little solar input, then they know you are using your batteries to generate revenues. This could required a insolation meter, and all of this will get expensive and complicated quickly. It seems that PV can be used for grid support by exporting and PGE or whomever should encourage on peak selling back to them. They could set a price for exported power below tariff, but still acceptable to the owner, and they would find that the solar exported power on peak is below their marginal cost for electricity.  
> 
> I know I have complicated this, but this is really what an industry group, the commission and the utility should work out.  In any case, a 10 kW battery system, will probably exceed most grid connected battery systems, and the whole issue is moot. 
> 
> 
> 
> 
> Sent from Finest Planet WebMail.
> 
> Christopher Warfel, ENTECH Engineering, Inc. PO Box 871, Block Island, RI 02807, 401-466-8978 (v)(f) _______________________________________________
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