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  • - A radical idea to get a high-renewable electric grid

    This is an interesting approach to optaining very high penetration of renewables such as photovoltaics and wind.  At present most large installations operate under Power Purchase Agreements (PPA) wherein the economics are based on a sell all output at predetermined prices. This contrasts with standalone systems wherein the system size Read More
  • - Breakthrough Batteries Powering the Era of Clean Electrification

    - Breakthrough Batteries Powering the Era of Clean Electrification Battery Storage Costs Drop Dramatically, Making Way to a New Era. A recent Rocky Mountain Institute (RMI) report continues to confirm that clean electrification through batteries is advancing at impressive rates. Very interesting report: Breakthrough Batteries- Powering the Era of Clean Electrification Read More
  • - Interesting Technology

    An assortment of links to interesting information   Semiconductor Nanowires Could Double the Efficiency of Silicon Solar Cells A p/n semiconductor junction is not the only way of converting sunshine into useful electrical energy.  Light consists of a flow of photons of various energy levels (colors).  See this article-Solar Cells.  Nanowires Read More
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December 7, 2021

With the recent upgrades and adjustments to the Tucson Electric Power (TEP) LAT3 13.8 kilovolt circuit in Marana, TEP is pleased to announce that all of the circuits on its local grid now have the capacity to support new residential solar projects sized at 20 kW AC and less.

This means homeowners who wish to install rooftop solar anywhere in the TEP service territory should be able to clear “Screen A” of Arizona’s Distributed Generation Interconnection Rules (DGIRs), allowing them to install systems that export excess energy to the TEP local grid.

As you may be aware, some TEP circuits were previously saturated with DG capacity exceeding levels referenced in the DGIR screening tests. Those tests compare the aggregate DG capacity on each circuit with that circuit’s peak load and minimum daytime load over the previous 12 months.

Since then, TEP has completed extensive hosting capacity studies and has made system improvements to expand capacity on circuits where new interconnection requests previously triggered additional review. All of the TEP circuits now have capacity for the addition of new residential exporting DG systems.

The TEP Energy Programs team will contact customers whose rooftop solar projects were suspended due to circuit saturation to inform them that these restrictions have been addressed and to invite them to submit their application to TEP.

TEP is committed to taking a proactive approach to surveying its system and identifying solutions to be able to accommodate additional growth.

If you have any questions, email TEP at This email address is being protected from spambots. You need JavaScript enabled to view it..

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  • Welcome to the Arizona Solar Center

     This is your source for solar and renewable energy information in Arizona. Explore various technologies, including photovoltaics, solar water heating, solar architecture, solar cooking and wind power. Keep up to date on the latest industry news. Follow relevant lectures, expositions and tours. Whether you are a homeowner looking to become more energy efficient, a student learning the science behind the technologies or an industry professional, you will find valuable information here.
  • About The Arizona Solar Center

    About The Arizona Solar Center Arizona Solar Center Mission- The mission of the Arizona Solar Center is to enhance the utilization of renewable energy, educate Arizona's residents on solar technology developments, support commerce and industry in the development of solar and other sustainable technologies and coordinate these efforts throughout the state of Arizona. About the Arizona Solar Center- The Arizona Solar Center (AzSC) provides a broad-based understanding of solar energy, especially as it pertains to Arizona. Registered Read More
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