Sunnova’s new system allows ratepayers to share excess clean power and be islanded from the conventional grid. What are the benefits of sharing storage capacity?
From pv magazine USA
Energy-as-a-service specialist Sunnova Energy has revealed that it has filed an application with the California Public Utilities Commission (CPUC) to develop a novel solution: a “micro-utility.”
The company seeks to develop largely self-sustaining micro utilities by equipping new home communities with solar and storage. Newly constructed homes will be the focus, so Sunnova can work closely with developers to design and implement distributed solar microgrids backed with resilient energy storage.
“Sunnova is breaking new ground by expanding its distributed energy service platform from homes to whole communities. We see a future where communities, neighborhoods, and businesses can operate independently from the legacy grid with sustainable energy sources that provide uninterrupted power,” William J Berger, the founder and CEO of Sunnova. “We believe microgrids address a strong need in the market for more robust energy solutions and better connectivity. The Sunnova Adaptive Community will provide consumers with the ability to produce, share, and deliver power when it’s needed most.”
The company has tajken formal steps before the CPUC to qualify as a “micro-utility” and to request a certificate to construct and operate microgrids under Section 2780 and Section 1001 of the California Public Utilities Code.
“SCMC’s application highlights the relief that the existing transmission and distribution system will experience given that most of the power that will be consumed by these communities will be generated locally from renewable resources,” said Berger. “We hope the CPUC moves expeditiously to approve our application so that we can begin serving new communities.”
In its 2021-22 transmission plan, the California Independent System Operator (CAISO) has announced 23 transmission projects at an estimated cost of $2.9 billion. A significant portion of these costs could be avoided if California instead pivoted to a decentralized model of energy.
In a report by the University of Otago in New Zealand, researchers took a demand-driven approach. They analyzed a per-minute resolution time series of individual household demand over several neighborhoods that contained distributed solar and energy storage.
They found that the collective use of batteries had dramatic effects on both load smoothing and peak demand shaving. Aggregation of smart storage led to a reduction in per-house battery requirements by 50% for load-smoothing needs and by 90% for peak shaving.
As an example, if peak shaving occurred for demand above 3 kW per house, deploying batteries individually for 20 houses would require 120 kWh of storage. By contrast, deploying batteries collectively would only require 7 kWh, the researchers said. Sharing batteries or having one battery per 20 houses would be a less expensive approach to providing these services, they said.
The researchers said the results make a case for coordinated battery deployment at the street or building level for multiple economic benefits. These benefits include the potential reduction in energy storage cost for homeowners (who could buy a smaller unit), benefits to the grid in easing demand and load related strains, and benefits to solar developers who can add another value chain to their operations by facilitating these grid services.
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