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Why owning your own power plant might not be crazy | Solar Heroes - Battery Hybrid, Off Grid & Grid Connect Solar System Specialists

Why owning your own power plant might not be crazy

28th May 2014


It’s been three months since we released The Economics of Grid Defection exploring when off-grid solar-plus-battery systems could reach economic parity with retail electric service.  These systems could become competitive with retail electric service within the next decade for many commercial customers and for many residential customers in the decade thereafter. Since the release of our results, the industry has been abuzz with follow-on commentary considering the implications for utilitiesconsumers, and third-party service providers.

Of course, favourable economics do not equate to adoption. Just because customers could defect doesn’t mean they will. For the individual customers actually considering these investments many other factors come into play, such as performance risk, hassle/convenience factor, and simply the plain, easy inertia of continuing to get their power as they always have.

Even so, it’s not that far-fetched to imagine a day when large segments of customers choose to go mostly or even entirely off-grid with clean, quiet, distributed solar-plus-battery systems. In fact, could owning your own power plant become as convenient and practical—if not quite as ubiquitous—as the consumer appliances and electronics already so commonplace that we take them for granted in our daily lives—a refrigerator, a clothes dryer, or a computer?


If we look at the lineage of our modern home appliances and personal electronics, the original predecessors of those we have today were often expensive, clunky, and unsafe. Yet engineers at companies such as General Electric, Maytag, and Whirlpool saw an opportunity and had a vision, which brought us light bulbs, refrigerators, washers, dryers, toasters, radios, electric stoves, and vacuum cleaners.

Decades later, similar vision and innovation brought us computers. The original computer processors were large, loud, and expensive. The computers of the 1960s and 70s were only practical for use by government agencies, large corporations, and universities, relegated to warehouses and specially designed office rooms. In that era, no one would have considered owning a computer for personal use, but the vision of Fred Moore, Steve Wozniak, and many other engineers at companies like IBM and Xerox brought us the power of personal computing that billions of people enjoy today.


When many people think of power plants they think of large industrial facilities with heavy machinery—hot, loud, and dirty. While this is an accurate description of many existing power plants, including those that I once operated, the personal power plants of the future will be much different.

Quiet, clean, and contained, your solar-plus-battery home energy system will be nearly indistinguishable from the refrigerator, chest freezer, or furnace in your basement—an essentially silent “box” that does something for you and your home, except this one will be connected to solar panels on your roof. In fact, as property developers and energy service companies become more familiar with these systems, they will most likely become integrated with the other systems in your home, leveraging the waste heat produced by your battery to help heat your home and provide other services.

Still, many will argue that personal power plants won’t offer the same game-changing value that personal computers or other appliances have brought us; that the cost savings, reliability, and environmental benefits of a zero-carbon personal power plant just won’t be that attractive to many homeowners.

Sandy, Irene, and Katrina suggest otherwise. If you don’t think many people value reliability, just look at the recent financials for Generac, the leading American manufacturer of residential back up generators. The company has seen year-over-year net residential sales increases of 31.7% in 2011,43.7% in 2012, and 19.6% in 2013.


There are those who might argue that personal power plants will seem too complex and technically sophisticated for most Americans. Well once upon a time, many said the same thing about computers. Computers are highly sophisticated machines, and most of us don’t have the first clue how to assemble a computer or write code, nor do we want to. Yet PC manufacturers such as Apple, Dell, and HP build computers that are suited to our needs, and software developers like Microsoft have given us the interfaces that allow us to fully use the computing power of these machines. Further, stores like BestBuy and Costco make it easy to purchase these devices, they’ll provide us a warranty, and service support when necessary. In other words, the technological complexity operating behind the scenes and under the product shell hasn’t deterred consumers from tapping into the incredible value and services such appliances provide.

Others will argue that these technologies are too expensive to go mainstream. While these technologies aren’t economical for the majority of U.S. consumers today (Hawaii being the one notable exception), the prices for these systems are on the decline, and if we consider air conditioning as another historical example of what lies ahead, these systems could be in a surprisingly large number of homes before we know it. Before mass production of the window air conditioning unit was made possible in 1947, air conditioners were only seen in luxury hotels and movie theaters. At the beginning of the 1950s, very few homes had air conditioning. By the end of the same decade, most American homes had a least one air conditioning unit. And by the end of the 1960s, most new homes were built with central air conditioning. What began as an expensive, loud, and obtrusive device you affixed to your window had become affordable, quiet, and integrated into almost every home.

To wit, personal power plants might be ready for consumer primetime, just like a wave of other examples where consumers switched from a centralized and/or outsourced service to providing it for themselves with appliances:

  • The switch from ice block delivery service to refrigerators and freezers
  • The rise of the swanky home theater system while large movie theaters have seen flat or even slowly declining ticket sales
  • The shift from delivery of firewood or district heating systems to the in-home furnace
  • The similar shift later in the 20th century to common in-home air conditioning units
  • The television’s “promotion” from a one-per-household appliance around which the whole family gathered to a point today where Americans on average have as many TVs as people per household, with a third of homes boasting four or more TVs

Power plants—once the expensive domain of an exclusive few (the ~3,000 U.S. utilities plus other generators) that built big, central versions—might one day in the foreseeable future give way to a personal power plant for the masses.


When put in perspective, a silent solar-plus-battery system—a personal power plant—that ensures our home has power, saves us money relative to buying electricity from a central utility, and lowers our carbon footprint, doesn’t seem all that bad, in fact, it seems pretty good. Or at least it will seem pretty good sometime soon. Such systems aren’t economic for most customers—yet. But that day will emerge over the coming decades.

So what does this mean for utilities, consumers, and third-party service providers?

  • The way we buy power will change. Where almost every consumer once made a phone call to the utility company to establish electric service, now some consumers will go to their local hardware or home improvement store and pick out a system that is right for them, to be installed later that day.
  • Property developers and energy service companies (ESCOs) need to start dating, or at least get a lot smarter about one another’s line of business. As we showed in our analysis, the greatest value exists when solar-plus-battery systems are integrated with complementary investments in efficiency. As we see the emergence of the “internet of things” the greatest competitive advantage will accrue to those companies that can provide bundled offerings that combine personal power plants with super-efficient appliances and home energy management systems to provide consumers with the greatest overall value with lower total overhead and transactional costs.
  • There is urgent need for regulatory reform. Currently, many utilities are not allowed to participate in distributed assets that displace or defer the need for traditional grid investments. Where this is the case, this regulatory limitation needs to be eliminated, allowing the utility to engage in opening the distributed power system market for the benefit of all.

Not everyone will want a personal power plant, and not every home will be suited to have one. There is still a great deal of technology innovation and industry evolution that will be necessary to make personal power plants a reality. Towards this end, RMI continues to work with both insurgents and incumbents to understand the implications these disruptive opportunities will have on the electricity industry. The detailed investigation of these systems and the likely opportunities for new business models, technology innovation, and regulatory reform will be the focus our forthcoming second report on solar-plus-battery systems. In the meantime, it’s worthwhile for everyone to consider that owning your own power plant might not be nearly as crazy as it seems at first glance.