“Personal Microgrid” Device Allows Customers to Use Alternative Sources in Outage

“Personal Microgrid” Device Allows Customers to Use Alternative Sources in Outage

Your power goes out.  You flip a switch to use your batteries, your EV, your solar panels, or your emergency generator and your home is functioning again.  Sounds simple.  It isn’t.  And it is one of the hottest areas for innovation in the transformation of the utility business,

It can be done in a clumsy way by running power cords throughout the house.  It can be done dangerously by jury-rigging a double mail end connector between a generator and a home outlet to energize a home.  It can eventually be done by a number of devices now being developed by dozens of clever innovators (see our blog on SPAN with its programmable power panel at our May 12 meetup with a programmable panel, and on WallBox with a two-way charger to connect an EV to the home) but they so far are expensive.  Now PG&E engineers have come up with a simpler solution that may be much less expensive.  It could be a key to let homeowners operate as their own “personal” microgrid in times of outages.

The PG&E device is a “collar” inserted between the smart meter and the meter plug on the home.  It has a tail to plug in the power sources from the home.  It can be used with a battery storage device or a small generator.  It is not made to be used to connect a car or solar PV panels that do not go through a battery buffer, as we understand it.  The home owner has to manually disconnect from the grid and trip off all the circuits in the home panel that will not be served, leaving on the ones that are deemed “critical”.   At the end of the outage, the homeowner will reconnect to the distribution grid and restore all the breakers to the “on” position.  PG&E isn’t selling it yet, so we don’t know the price, but other devices we have reviewed cost $5-7,000 to do these functions.  Surely it will be less.

Here is an article that explains more about what PG&E is doing, if you want to dive into it. 

Thomas Hall

ABOUT THE AUTHOR

Gary Simon is the Chair of CleanStart’s Board. A seasoned energy executive and entrepreneur with 45 years of experience in business, government, and non-profits.

CleanStart Sponsors

Weintraub | TobinBlueTech Valley, Revrnt, 

Moss AdamsPowerSoft.biz, Greenberg Traurig, California Mobility Center

“Personal Microgrid” Device Allows Customers to Use Alternative Sources in Outage

Big Step: Sunnova to Create Community Microgrids as Regulated Utilities

Rather than run away from being regulated, Sunnova sees advantages in becoming a regulated utility in order to advance its plan to collaborate with developers of new neighborhoods to create shut-off safe microgrids.  The CPUC opened this possibility by creating a “light-handed” regulatory scheme for microgrids of fewer than 2000 customers.  Prices would be overseen by the CPUC, but microgrids would not be subject to most of the requirements for filings and documentation that the big regulated utilities face.  The combination of higher reliability power service at prices that will be reviewed for fairness might be very attractive to those looking for a new home.  That clearly is what could motivate developers to offer this opportunity.  Lennar has already jumped on-board.

Texas-based Sunnova is a medium-size residential solar company with about 208,000 customers.  It has been doing rooftop solar and battery systems one home at a time.  This bold move to do whole communities is a big step for them.

Sunnova would install rooftop PV, community solar, energy storage, backup generation, and demand controls, making each microgrid a Virtual Power Plant for dispatch by CalISO.  The microgrid would separate from the grid during an outage and the customers would rely on its on-site power. The objective is to have the microgrid operate independently for a minimum of 300 hours.  The community would still be connected to the grid but rely on it for 20% or less of the power to meet customer needs.  Sunnova says the microgrid would cost about $16,000 to $20,000 per home.  

Sunnova contends their approach would also avoid some of the need for upgrading the distribution system to accommodate distributed renewable generation.  If so, Sunnova may have a “win-win” solution to adding renewables and maintaining high levels of reliability at a lower price tag than more conventional approaches.  

As a pioneer of this approach, Sunnova may be imitated by others.  Many will be watching and likely coming up with their own variations.  One key step will be whether this can be applied in existing neighborhoods, where it may not be as easy as in a newly constructed one.  And who knows what “light-handed” regulation may actually entail.  There is a lot to be learned by this experiment, especially whether it can accelerate the movement to more community microgrids.

Thomas Hall

ABOUT THE AUTHOR

Gary Simon is the Chair of CleanStart’s Board. A seasoned energy executive and entrepreneur with 45 years of experience in business, government, and non-profits.

CleanStart Sponsors

Weintraub | TobinBlueTech Valley, Revrnt, 

Moss AdamsPowerSoft.biz, Greenberg Traurig, California Mobility Center

CleanTech Showcase 2022

CleanTech Showcase 2022

INNOVATIONS TO DRIVE CARBON-FREE POWER

Join industry experts and startups as we explore and showcase the innovations in our region that will drive our carbon-free power future.
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During this free half-day event, the showcase will feature and spotlight startups, innovators, and industry experts through talks and panels exploring the need for a carbon-free future, opportunities, the current state of climate tech, utility supply and customer demand.

Date: April 12, 2022, 9:00am – 12:00pm

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Evolution of the Grid and Renewables Policy in California

Evolution of the Grid and Renewables Policy in California

Nick Pappas, founder of NP Energy and our Perspectives presenter on January 27, is something like a midwife.  He found that his best skill was in helping clients ease the transition to a renewable energy system by explaining the pains involved, how to deal with them, how to avoid some of them, and keeping the benefits of the end point in mind.  In doing so, he is very good at highlighting upcoming opportunities and at warning of where risks need to be avoided.  It is not a good idea to ignore his insights.

He is passionate about smoothing this transition and demonstrating how it can be successfully adopted elsewhere.  As he says, he wants to make good, workable climate policy “California’s #1 Export” and building the blueprint for others to follow so that there is maximum contribution to avoiding serious climate change.  California’s big deregulation move in the 1990s was not done well and led to the extreme price swings and rolling blackouts of the early 2000s.  California became the big negative example.  Nick wants to see there is not a repeat of that.

We covered a lot of ground in our 30 minutes with him.  Here are some of the highlights we got out of his talk (with apologies to Nick for embellishing some of this points).

  • Reliability of the grid is a complex challenge, and our understanding of grid reliability and planning is evolving over time. How do we successfully orchestrate the transition to clean energy?
  • There is a “storage revolution” coming.  For the first time in the coming summer and the next, there will be enough big storage projects on line (over 2000 MW of grid-level storage in 2022 and 5000 MW in 2023) to test how Cal ISO will be able to integrate storage into the dispatch and how the pricing of the energy from it will work out.  We will probably be surprised.
  • At the same time, there will be a lot of retirements of conventional generation in the next three years, especially of the 2.2 GW at the Diablo Canyon nuclear units.  Managing a retirement of that scale could pose a lot of operational issues, and we need to get ahead of that problem before it becomes a blot on the transition.  
  • Overbuilding solar and wind resources can make a serious dent in electric sector emissions, but overbuilding alone will not be sufficientto fully decarbonize the grid. We need creativity and innovation on our pathway to 2045.
  • There is much more opportunity in “flexing” loads to match demand to supply than is being exploited.  It may be much cheaper to do that than to attempt to solve renewable integration solely throughthe 15,000+ MW of storage now contemplated in the latest CPUC view of what investments in power sources are needed in the next 10 years. Demand flexibility will supplement that storage and provide more operational flexibility.   However, human behavior remains a major barrier to load flex capability that is being tried now.  In the future, consumers may not be able to override the flex signals from the utility as they do now.  In any case, it may deserve a more intensive effort to utilize than it is getting now. How will the “flex” be done in a way consumers won’t care and is better than calls for voluntary shut offs?  
  • The growth in the number of EV chargers and electric heat pumps (as a part of replacing gas appliances with electric alternatives) could provide the best option for creating a critical mass of flexible load, unless we miss that opportunity.  How do we make the addition of the flex feature easy and worthwhile?
  • The additions of more renewable sources and more storage can help drive down the cost of these resources through innovation and economies of scale. We should expect prices to continue to fall, especially, for storage, though supply chain, resources, and development have significant potential to increase costs and cause delays.
  • The storage being added will resolve the daily mismatch between demand and supply, but the seasonal gap—the need to move excess generation from Spring to Fall—is much harder to address.  Building big, high capital cost battery storage to be used at a very low capacity factor may not be an acceptable solution.  Innovative ways to use chemical storage, such as hydrogen, to decarbonize the existing combustion fleet may help address these rare peak events.
  • Decarbonizing electricity is important, but we should not forget the opportunity cost of much lower-hanging fruit in the transportation, building, and industrial sectors where there may be better bang for the buck, more CO2 reductions per dollar, than continuing to work only on the electricity sector.  It is a bit harder to see how incentives or limitations could be applied in these other sectors, but it is worthwhile to figure it out and to innovate approaches that work in a competitive economy.
  • The value of rooftop solar to the building owner is likely to decline.  Even if the CPUC’s proposed decision on net metering is further moderated this time, it will not be the end of this debate, but the trend will be for compensation to be more closely aligned with value. Ensuring these systems provide value – particularly how storage is dispatched on the grid – may mitigate this risk.

It was a lively session and you can watch the entire recording of it below.  Nick had so much to say we are going to invite him back to continue this discussion. 

Thomas Hall

ABOUT THE AUTHOR

Gary Simon is the Chair of CleanStart’s Board. A seasoned energy executive and entrepreneur with 45 years of experience in business, government, and non-profits.

CleanStart Sponsors

Weintraub | TobinBlueTech Valley, Revrnt, 

Moss AdamsPowerSoft.biz, Greenberg Traurig, Momentum,

College of Engineering & Computer Science at Sacramento State

CleanTech Meetup: Energy Storage

CleanTech Meetup: Energy Storage

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