Cut the Cord On Your Utility? It Could Be Possible Sooner Than You Think

solarbatteryhome With performance improving, production volumes rising and costs on the decline, intelligent battery storage systems may provide the missing piece of the clean energy puzzle, enabling customers to cut the cord linking them to utility grids and ushering in the end of the centralized electric utility business model.

Analyzing regional scenarios across the U.S., the Rocky Mountain Institute (RMI), CohnReznick Think Energy and HOMER Energy concluded that utility grid parity for the combination of solar photovoltaic (PV) and battery storage systems is “already here in some areas and imminent in many others for millions of U.S. customers.”

The combination of solar PV and battery storage technologies – what the authors of “The Economics of Grid Defection” dub “utility-in-a-box” – can make “the electric grid optional for many customers – without compromising reliability and increasingly at prices cheaper than utility retail electricity.”

Solar PV and battery storage: The “utility in a box”


The report’s authors draw three main conclusions from their scenario analysis:

  1. Solar-plus-battery grid parity is here already or coming soon for a rapidly growing minority of utility customers, raising the prospect of widespread grid defection.
  2. Even before total grid defection becomes widely economic, utilities will see further kWh revenue decay from solar-plus-battery systems.
  3. Because grid parity arrives within the 30-year economic life of typical utility power assets, it foretells the eventual demise of traditional utility business models.

Significantly, according to the authors of “The Economics of Grid Defection,” nationwide grid parity for the combination of solar PV and battery storage systems is likely to occur “well within the 30-year planned economic life of central power plants and transmission infrastructure.”

“Even before mass defection, a growing number of early adopters could trigger a spiral of falling sales and rising electricity prices that make defection via solar-plus-battery systems even more attractive and undermine utilities’ traditional models.”


The results of analyzing four cases across five representative regional scenarios present electric utilities with a stark choice: Adapt to the emerging distributed clean energy infrastructure or face the “utility death spiral.” According to the report authors:

“New market realities are creating a profoundly different competitive landscape as both utilities and their regulators are challenged to adapt. Utilities thus must be a part of helping to design new business, revenue, and regulatory models.”

*Image credit: Kyocera

Graphs credit: Rocky Mountain Solar Institute, CohnReznick Think Energy and HOMER Energy, “The Economics of Grid Defection”

Newsletter Image Credit: Flickr/joncallas

An independent journalist, researcher and writer, my work roams across the nexus where ecology, technology, political economy and sociology intersect and overlap. The lifelong quest for knowledge of the world and self -- not to mention gainful employment -- has led me near and far afield, from Europe, across the Asia-Pacific, Middle East and Africa and back home to the Americas. LinkedIn: andrew burger Google+: Andrew B Email:

2 responses

  1. Why would I want to cut off my two Megawatt battery storage? I use power from three months of solar collection (stored in dollars on the grid) to offset my gas heat during the coldest months…

  2. Ref. Sagegray: Why? 3/14/14. I’ve had PF since 2009 using the grid for storage, but now I have second thoughts. It seems Arizona Power does not like the policy too much. They cut my allowance per KWH from .06 cents to .0278 cents, that amounted to about a $300. cut. for the year. For electricity I use from the grid they charge me up to 15.8 cents per KWH. Nice little profit huh.

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