Tag: "sce"

05/12/20

  06:41:00 am, by Jim Jenal - Founder & CEO   , 949 words  
Categories: All About Solar Power, Residential Solar, Energy Storage

New Rule in SCE Territory Makes Solar + Storage More Valuable

We just learned from our friends at Energy Toolbase that Southern California Edison has just changed a rule about how solar PV systems with Energy Storage can operate, and the result - amazingly enough - results in greater savings for our clients!  Imagine that?!?  Here’s our take…

It used to be in SCE territory that when you added a storage system to your PV array, you could not export energy from the storage system to the grid and receive net metering credit.  That meant that when the storage system was discharging, it could not exceed what the home’s loads were demanding.  If your usage in the evening was low, or say you were out of town, your fully charged battery could not discharge at all - a poor utilization of that expensive storage system.

But now SCE - along with the other IOU’s, PG&E and SDG&E - have changed their rules to allow storage systems to discharge back to the grid and receive full net metering credit for that energy, as long as the storage system is solely charged by the PV array.  When you combine that rule change with electricity rates that favor storage, such as SCE’s TOU-D-Prime rate, the change in the rule can account for significant savings.

To get a handle on how big a change this will be, we went back to the data that we have for a client who we will be installing a small PV array and a 10 kWh Ensemble storage system soon.  (All of our data analysis and visualizations you see here were done using Energy Toolbase, simply the best presentation tool on the market.)

Solar PV & Storage - No Net Metering Discharge

Our client with the small, 4.6 kW, PV system and 10 kWh Ensemble storage system has a system payback of 11.4 years.  (Larger systems would have a faster payback.)  For this analysis, we imported his SCE interval usage data (provided by UtilityAPI) into Energy Toolbase.  ET then takes the performance output from the PV system, the charge and discharge parameters of the storage system, and overlays that on the existing usage - doing that calculation over every fifteen minute interval for a year.

The graph below shows one day, July 8th, as a representative sample.  Let’s break this down:

Solar PV + Storage - no net metering discharge

There’s a lot going on in this image (click on it for a larger version).  The dark gray is the historical usage demand based on the SCE data.  The value is shown at the top as “Current Demand” and at the moment we have focused on - July 8 at 4:15 p.m. - the historical demand was 1.94 kW. 

The green curve shows the modeled PV array output, using the specific parameters for this site - azimuth, tilt, shading, historical weather, specific equipment being used - as determined by NREL’s PVWatts tool (version 5).  Right now it is at 1.17 kW. 

The red line shows the percentage state of charge for the storage system, at this moment it is 83%.  Net Demand is what is being imported (positive number) or exported (negative number) to the grid.  Finally, Battery Power is how much power is being pulled from the storage system which at this moment is 1.94 kW.  At the bottom is the cost parameters for this rate schedule.  Under the pre-solar Domestic rate (which is a tiered rate) the cost of energy is 18.7 cents/kWh, whereas under the new rate structure it is more than twice that at 38.3 cents during the peak, 4-9 p.m. period.

 So… earlier in the day, as the output from the PV increases, and energy charges are cheap, the solar charges the battery for use later when the rates are high. As we cross over into the peak rate period at 4:00, the storage system begins to discharge and its output is exactly the same as the demand, meaning that all of the power from the PV system can be exported to the grid. 

But note that the battery power is only 1.94 kW, even though its continuous peak output is roughly twice that, 3.84 kW.  Under the old rules though, the storage system cannot output more than that, since it is barred from exporting to the grid.  As a result, when the peak rate period ends at 9:00 p.m. the storage system shuts off, even though it is still partially charged (nearly 40% capacity remains in this example).

That’s leaving money on the table!

Solar PV & Storage - Net Metering Discharge Allowed

Consider the same day, only now we can export the full output of the storage system as desired to maximize our time-of-use arbitrage.

Solar PV + Storage - no net metering discharge

Everything is essentially the same until we get to 4:00 p.m. and then things get very different!  Look at the difference in the output from the battery system, it is now putting out it’s maximum sustained power of 3.84 kW, resulting in more than 3 kW being exported during the peak price period

More importantly from an arbitrage perspective, the storage system is completely cycled.  Meaning that we have gotten full utilization from our storage system investment.  

What does that mean overall economically?  Payback is reduced from 11.4 to 10.7 years, a 6.1% improvement.  Gee, thanks, SCE!

So why are they doing this?  Simple: grid support. Having storage systems maximizing their output during the peak demand period (remember the Duck Curve?) helps the utility to manage its load, and reduce the need for expensive peaker capacity. Everybody benefits: our client (with faster payback), the utility (with better grid load management), and even non-solar/storage rate payers (as they don’t have to pay for that additional production capacity.  Win, win, win!

Of course, these economic benefits don’t really apply to a tiered rate structure, such as is used for residential rates in PWP territory.  But if you are in SCE territory, adding smart storage, like the Enphase Ensemble system, just became a lot more lucrative.

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03/13/19

  07:15:00 pm, by Jim Jenal - Founder & CEO   , 411 words  
Categories: All About Solar Power, Solar Economics, SCE, Residential Solar, Ranting, CALSSA

Clean Power Alliance -- NEM Fail!

Back in January we wrote about the pending switch over to Clean Power Alliance (CPA) in portions of SCE’s service territory (Clean Power Alliance is Coming - is that a Good Thing?), noting that given the slightly lower rates, the switch was probably a good deal for most SCE customers.  Alas, it turns out that it wasn’t such a good deal for SCE’s solar customers!  Here’s our take and recommendation…

PLEASE NOTE: THIS APPLIES ONLY  TO SCE CUSTOMERS!
SOLAR CUSTOMERS IN PWP, LADWP AND OTHER MUNICIPAL UTILITIES CAN IGNORE THIS COMPLETELY!

Yesterday our trade association, CALSSA sent out this urgent notice under the headline: ALERT: CPA NEM snafu:

ACTION: For existing residential customers, we suggest you advise them to OPT OUT of the Clean Power Alliance (LA area CCA) by March 31st!

To opt out, they should call Clean Power Alliance at 888-585-3788 immediately.

What is going on here?  It seems that in their zeal to initiate the switchover from SCE, CPA fouled up how they are handling the “true-up” accounting.  As a result, solar customers who switched to CPA—and mind you, if you are in one of the affected cities, the default is for you to be switched to CPA—you will actually receive two true-up bills this year - one from SCE and the other from CPA.  CALSSA is sufficiently concerned that this could have an adverse financial impact that presumably exceeds whatever saving you might realize from the switch to CPA’s lower rates.

According to CPA, customers who OPT OUT by March 31, will only have one true-up bill this year “as if nothing had ever happened.”

For solar system owners who are part of the Solar Rights Alliance, they have already received notice directly regarding this situation.  (Not yet a member of the SRA?  Sign-up here.)

Here’s a list of cities participating in the CPA switch:

Unincorporated area of Los Angeles (e.g., Altadena) and Ventura Counties and the following cities: Agoura Hills, Alhambra, Arcadia, Beverly Hills, Calabasas, Camarillo, Carson, Claremont, Culver City, Downey, Hawaiian Gardens, Hawthorne, Malibu, Manhattan Beach, Moorpark, Ojai, Oxnard, Paramount, Redondo Beach, Rolling Hills Estates, Santa Monica, Sierra Madre, Simi Valley, South Pasadena, Temple City, Thousand Oaks, Ventura, West Hollywood and Whittier.

Once things get sorted out, if you want to switch to CPA, you will be able to do so, and we will write about it once we know more.  But for now, the prudent choice appears to be to make that call and opt-out.  If you have any issues in doing so, please let us know.

01/08/19

  07:24:00 pm, by Jim Jenal - Founder & CEO   , 455 words  
Categories: All About Solar Power, Solar Economics, SCE, Residential Solar

Clean Power Alliance is Coming - is that a Good Thing?

Clean Power AllianceThe Community Choice Aggregator (CCA) for LA County, Clean Power Alliance (CPA), is set to begin service to SCE customers in 31 cities starting February 1.  As this has just sort of been announced as a fiat accompli with very little information to consumers, we wanted to set the stage for an analysis that we will be publishing that should answer the question - is this a good thing or not?

Let’s start with the basics, what is a CCA? Here’s a definition from an EPA website:

Community choice aggregation (CCA), also known as municipal aggregation, are programs that allow local governments to procure power on behalf of their residents, businesses, and municipal accounts from an alternative supplier while still receiving transmission and distribution service from their existing utility provider. CCAs are an attractive option for communities that want more local control over their electricity sources, more green power than is offered by the default utility, and/or lower electricity prices. By aggregating demand, communities gain leverage to negotiate better rates with competitive suppliers and choose greener power sources.

That means that current SCE customers would still receive their service via SCE (including billing) but the energy is actually provided by the CCA, in this case CPA, at one of three rates: “Lean” (which is 36% renewables and lower than SCE), “Clean” (which is 50% renewables and comparable to SCE), and “Green” (which is 100% renewables and higher than SCE).  Different cities can choose for their residents the “default” rate - for example, Arcadia chose Lean, Alhambra chose Clean, and South Pasadena chose Green - but individual consumers can override that default and pick the rate they prefer.  (You can find the present list of cities switching to CPA and their default rates here.)

However, the only portion of the bill affected is the energy charge, which is generally a smaller component than is delivery.  For example, here is a comparison for SCE customers on the Domestic rate for what they pay now compared to under the “Lean” option from CPA:

SCE Domestic vs CPA Rate

So your savings is about 10% on the first 300 or so kWh (or about $5), but if you make it into the highest tier, your savings drops to just 4.5% on the largest usage.   (Interestingly, SCE’s delivery rates changed a lot more than what is seen in this shift to CPA’s Lean rate.  In particular, the delivery charge for the lowest tier went up by 5.8% as of January 1st, and by 22% for Tier 3 - ouch!)

You can find the complete list of CPA’s rates as of this writing, here.

This Domestic rate is the easiest to review - in a subsequent post we will talk about Time-of-Use rates (relevant to recent and future solar owners) and how to make the right choice to maximize your savings.

Watch this space.

09/30/18

  07:45:00 pm, by Jim Jenal - Founder & CEO   , 896 words  
Categories: All About Solar Power, SCE/CSI Rebates, BWP Rebates, GWP Rebates, LADWP Rebates, Electric Cars that Run on Sun

EV Rebates - not just for PWP Customers!

Last month we wrote about a rebate program being offered by Pasadena Water & Power for both the purchase of an Electric Vehicle (new or used) as well as the installation of EV chargers.  Which got us to thinking, don’t the other local utilities have something similar?  Well guess what, they do!  Read on to see what might be available from a utility near you!

EVs being charged

Southern California Edison (SCE)

SCE offers rebates for both purchasing an EV as well as installing a level 2 (i.e., 240 VAC) charger.

EV Rebate

The SCE rebate for purchasing an EV is $450.  Here are the requirements:

  • You must be an SCE residential customer (vehicles registered to businesses are not eligible).
  • The EV must be among the vehicles listed on the Drive Clean website (which lists 35 models of EVs from 2018 alone!).
  • The vehicle’s registration address must be the same as the customer’s address with SCE, but the name on the service account need not be the same as that of the vehicle owner.
  • The vehicle’s registration is current with the State of California.
  • The vehicle has not received more than two rebates in the past.
  • If you have multiple EVs, each vehicle is subject to a rebate if the above qualifications are satisfied.

To apply for the SCE EV rebate, go here.

Charger Rebate

SCE also offers a rebate of $500 to install a Level 2 charger at your home.  Here are the requirements:

  • You must enroll in one of the available Time-of-Use (TOU) rates.  BE CAREFUL!  Depending on your usage patterns this might be a very expensive option!  Run on Sun can, for a nominal fee, assess your present usage and let you know what your annual bill would do under each of the available TOU rate options.  Please contact us if you are interested in our providing you with this service.
  • You need to pull a permit for the installation, and have the work performed by a C-10 electrician (B contractors are not allowed to participate in this rebate program).
  • You need to provide a copy of the signed-off permit after inspection and a copy of your permit receipt (be sure the electrician provides you with these documents).

To apply for the SCE EV charger rebate, go here.

Los Angeles Department of Water & Power (LADWP)

LADWP does not appear to offer a rebate for the purchase of a new EV, but they do offer a rebate for purchasing a used EV, as well as installing an EV charger.  Their overall EV page is here.

Used EV Rebate

LADWP is offering a pilot program for the first 2,000 approved applicants who purchase an EV two or more years old (i.e., model year 2016 or older).  The rebate is $450 and opened on April 1, 2018. 

Here are the requirements:

  • EV must be two years old or older, and never received an LADWP rebate for its purchase previously.
  • EV must have been purchased after April 1, 2018.
  • Permanent residence must be served by LADWP
  • Complete the rebate application - download it here.
  • Copy of DMV registration
  • Copy of bill of sale
  • Proof of residence

EV Charger Rebate

LADWP offers a $500 rebate for installing a Level 2 EV charger (i.e., 240 VAC).  Program requirements are:

  • Completed rebate application - download it here.
  • Proof of EV charger purchase - paid invoice that includes
    • Purchase date
    • Retailer name, address and phone
    • EV charger make and model
    • How paid for - check, credit card, etc.
  • DMV registration that shows EV registered at account address
  • Photos of completed installation, nameplate of charger (showing serial number, make and model number)

Interestingly, LADWP does not specifically require the installation to be permitted and inspected.

Burbank Water & Power (BWP)

BWP offers a rebate of $500 for residential EV charger installations.  (You can access the rebate application here.)  They do not appear to offer a rebate for purchasing EVs.

Program requirements for the EV charger rebate are:

  • Applicant must be a BWP customer or charge their EV at a location served by BWP.
  • Agree to be switched to a Time-of-Use rate in return for the EV charger rebate.  CAUTION: this could be an expensive switch.  Be sure to consider how and when you use energy before agreeing to switch.
  • Application must be submitted within four months of purchase.
  • Installation must be hardwired (i.e., not plug-in) Level 2, and permitted and inspected by the City.
  • Supporting documentation including:
    • Copy of charger purchase receipt/invoice
    • Copy of installation receipt
    • Copy of signed-off permit
    • Copy of DMV registration
    • Photo of installed charger

Glendale Water & Power (GWP)

As is often the case, GWP’s programs mirror those of BWP.   GWP offers a $500 rebate for residential EV charger installations, but nothing toward the purchase of the EV itself.  Here’s a link to their overall EV page.  One interesting wrinkle, GWP issues the rebate in the form of a credit on your GWP bill - none of the other rebate programs said that.

Here are the requirements for the EV charger rebate:

  • Applicant must be an active GWP account holder.
  • Charger must be a new, Level 2 (i.e., 240 VAC) charger, and the application must be submitted within four months of purchase..
  • Installation must be permitted and inspected by the City if the charger is hard-wired.
  • Supporting documentation includes:
    • Copy of charger receipt/invoice
    • Photo of installed charger
    • Copy of labor receipt (optional)
    • Copy of the signed-off permit (if required)
    • Copy of DMV registration and car purchase or lease agreement

Access the GWP EV charger rebate application form here.

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08/17/18

  03:15:00 am, by Jim Jenal - Founder & CEO   , 1210 words  
Categories: All About Solar Power, Residential Solar, Energy Storage

What I Saw at Enphase - Mind Blown!

Enphase hqLast month during Intersolar, I (along with colleagues Sara and Victoria) was lucky enough to get invited to see a microgrid demonstration featuring the Enphase next-gen IQ8 at their headquarters in Petaluma, California.  As I had to sign an NDA as the price of admission, I was unable to write about what I had seen until today, when Enphase hosted their annual Analyst’s Day.  But I am no longer bound by that agreement, and can now tell you about what I saw. 

To say that I was impressed would be a gross understatement - quite simply, it was the most astonishing thing I have ever seen in the solar industry.  Settle in and let me tell you what I saw…

What Happens Today

Before I launch into describing the demo, let me remind you of what happens today.  All of the systems that we have installed are what is referred to as “grid-tied” which means that if the grid goes down, the PV system that is capable of back-feeding the grid also goes down, and remains down until the grid comes back.  (This is to prevent your house from being an island of energy, feeding the grid, and potentially injuring a worker trying to restore grid service.  As a result, this feature is known as “anti-islanding” and it is required of all inverter systems that are connected to the grid.)

Normally this is not a problem, but last month, when it got super hot out here (think 115° F hot!), both SCE and LADWP suffered dozens of outages, taking down PV systems across large swathes of LA County, and leaving frustrated PV owners without power, or A/C, just like their PV-less brethren.  Not good.

What I Saw in the Lab

Which brings us to what I saw at Enphase last month.

The lab looked like an ordinary industrial space, but with a series of household appliances and tools at one side.  There was a simulated array feeding a bank of IQ8 inverters, and a display that showed the output of the array (i.e., PV production), the total consumption from the loads, and any power being exported or imported to support those loads.  At the start of the demo the only load was a single red lamp, and the display indicated that it was drawing roughly 90 Watts.  The PV array was producing roughly 1.9 kWs, so the excess 1,800 Watts was being exported to the grid.  All super normal stuff.

But then things got interesting…

One of the engineers switched off the breaker that connected the PV array to the grid… and nothing happened!  Well, actually, a lot happened, but what didn’t happen was that the red light did not go off.  It didn’t even flicker to the extent that we could detect it.  But then when you looked at the display you noticed something amazing.  Not only had the microinverters created a grid on their own in fractions of a second, but they had throttled the output down so that now the production of the PV array exactly matched the load of the red light!  And here’s the kicker - there were no batteries attached to this system!!!

But what fun is just having a light on?  How about some toast?  So they switched on a toaster, and it lit up, and the total load jumped by about 1,000 Watts, making the total load now around 1.1 kW, and the PV array scaled up to meet it!  Still no batteries.  And how about this - there was no central controller, no master-slave relationship between the microinverters.  Rather, this was the “hive mind” at work, as the micros sensed the demand and scaled up or down as necessary to meet that load!

But wait, there’s more!

The next load to be added was a grinder like you might find on your workbench in the garage.  All by itself, that device drew roughly 1,200 Watts, bring our total load to roughly 2.3 kW - more than the maximum output of our simulated array.  What would happen when that was added to the mix?  Surprisingly little.  The grinder spun normally, but the red light dimmed slightly.  What was going on?  The system’s “hive mind” had lowered the voltage slightly (a microgrid equivalent of a brown out) to meet the amperage demand of the new load mix!  So slightly slower than normal, cooler than normal, dimmer than normal, but all operating.

Of course, all good things must come to an end.  Our already overloaded microgrid faced one more challenge - a vacuum cleaner with a significant in-rush current, far in excess of what the grid could sustain.  Indeed, as soon as they switched the vacuum cleaner to “on", everything shut off.  Nothing was damaged, the microinverters just shut off to protect themselves.

Turning on the vacuum cleaner served as the “ah-ha” moment for the potential homeowner - I guess I can’t run everything in grid outage mode.  So what do you do when something you just did produced an undesired result?  Well if you can, you undo it!  Turning the vacuum cleaner off, immediately restored the microgrid to its previous state of operation!  No delay.  No human intervention - just turn off that latest (over)load, and the system recovers on its own!

How cool is that?  Pretty damn cool, if you ask me!

Batteries Please?

So what about batteries, how do they play with this new system?  Just exactly as you would want.

The engineers added a bank of batteries to the mix, each with an IQ8 installed.  Now the display also indicated the battery’s overall state of charge, and whether they were charging or discharging.  Reset the demo to just the red light as a load and the batteries at 30% state of charge.  The PV array output jumped back to its maximum, with the surplus energy being used to charge the batteries.  As more loads were added, the PV array remained at maximum output, and as needed, drew power from the batteries.  Should the batteries reach full capacity and the PV output is greater than the loads, the microinverters will once again throttle down.

Sweet!

What’s Next?

I hope you agree that this was an amazing demo, and the IQ8 (or Ensemble, as Enphase refers to the overall system) has tremendous potential, both for Enphase as a company, and for so many nascent markets.  Think of how this product could have helped out in Puerto Rico, or in parts of Africa which have never, ever seen a grid!  Makes me want to book a trip to bring power to a village somewhere - hey Laurel, what do you say?

For our own clients, this has the potential to be the answer we have been seeking ever since Elon’s whoppers got people thinking about storage for the first time ever.

A point we raised with Enphase management is the need to have a reasonable upgrade path for existing clients.  Indeed, I have a call with Enphase tomorrow to discuss that very topic.  We know that current Enphase IQ products (the 6+ and 7+ we have been installing this year) will be compatible with Ensemble.  We expect to be able to work with older systems, though there may be a higher retrofit cost.  When we have that information, we will surely let you know!  The IQ8 is expected to be available in 1H2019… watch this space!

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Jim Jenal is the Founder & CEO of Run on Sun, Pasadena's premier installer and integrator of top-of-the-line solar power installations.
Run on Sun also offers solar consulting services, working with consumers, utilities, and municipalities to help them make solar power affordable and reliable.

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