When will electric vehicles provide grid storage?

This post was originally published in Reneweconomy on 28 March 2014

Close your eyes and picture yourself in a sleek new electric car – powered by clean electricity, emitting no pollution, silent and cheap to run.  Parked in your garage, it stores energy from your solar PV system to provide mobility and power your home.

But is it going to happen?… And if so, how and when?

The vision of parked vehicles being used for grid storage has captivated people since EVs began (re)emerging as a viable transport option – wind and solar variability could be solved through intelligent application of an underutilized asset!  Now with solar uptake booming in the U.S. and over 180,000 plug-in vehicles on the roads providing 4 GWh of potential storage capacity[1], the time has surely arrived to pull the pieces together?

The good news is that the technology is here or not far away.  Advanced vehicle/grid control systems can protect the battery and manage energy flows in line with network needs.  Interoperability across the various technology interfaces is advancing through the evolution and application of recognised standards.  These developments will provide enhanced visibility and control for network and vehicle operators, allowing them to cooperate easily, conveniently and for shared benefits.

The story from here will reflect the realities of car use, the insights from Big Data, and the power of visual association.

Experience has shown that vehicle owners are largely, but not entirely, predictable – most use their car during the day and charge overnight. While charging tends to happen when it is cheapest, drivers manage charging in line with the primary use of the vehicle as transport.  For energy service providers this translates to uncertainty – not a great foundation for business success.  When viewed alongside the relatively small storage capacity of individual vehicles relative to stationary batteries, the focus for the foreseeable future will be on the alternative.

The areas of opportunity are instead those with more certain benefits that outweigh the cost and effort involved in setting up the vehicle-to-grid system.

An obvious example lay in use of the cars for emergency back-up power, when access to electricity may be life-saving.  Equipment available now allows EVs to be used as a direct power supply independent from a hardwired electricity network.  Use of the vehicles as storage within independently capable and controllable microgrids has been identified as a means of providing increasingly valuable system resilience.

For non-emergency applications, the pathway will be through evolution of existing grid-connected installations – analogous to that unfolding for microgrids above.  Electric vehicles often operate out of locations that also feature distributed energy resources, such as solar PV.   This coincidence is intended, as the visual association of the two technologies provides significant “brand value” while in the early-market adoption phase.

Through analysis of the energy and vehicle activity data at these locations, much can be discerned about the opportunity for surplus energy to be directed to the cars when parked.  Individualized system design and control strategies can then be developed so as to deliver more certain benefits for only incremental investment.  These projects will serve as a stepping stone for the mainstream, commoditized solutions of the future, where cheap, clean and locally-produced energy is used for transport or stored in vehicles for later re-use.

Bringing these individual, site-based solutions together in the wider network context will unfold as local electricity market regulation allows and incentivizes it.  Regional operators may manage a number of distributed energy resources from across their network collectively as Virtual Power PlantsProjects of this type are already underway, endorsing the view of the future utility customer as a ‘prosumer’.  Through this model, a car may provide grid support from various locations within a network as it relocates over the course of a day – a scenario that represents the ultimate realization of the vehicle-to-grid concept.

For individuals who want to get the ball rolling, the first step would be to compare a record of vehicle movements with the generation profile of your home solar system.  Understanding the overlap will highlight the potential to generate your own transport energy.  Managing your EV charging to consume surplus energy generation may provide a financial benefit that would offset the absence of a feed-in tariff.

In the near-term the cost and effort involved will likely appeal only to the minority for whom the sometimes intangible benefits really matter.  These ‘early-adopters’, who will be strongly motivated by the visual synergy of co-located vehicle charging and solar generation, are a feature of any new technology adoption.

As the pathway seems clear and the technology is here, the future is now.

A co-located Electric Vehicle (EV) charging and solar generation facility at the CERES Environment Park in East Brunswick – an example project of the type that is a stepping-stone for EVs as grid storage (Source: CERES).

A co-located Electric Vehicle (EV) charging and solar generation facility at the CERES Environment Park in East Brunswick – an example project of the type that is a stepping-stone for EVs as grid storage (Source: CERES).

[1] Author’s calculation based on a breakdown of sales by vehicle type and battery storage capacity

The long road for electric vehicles

This post was originally published in The Conversation, 25 June 2013

After a much-hyped return to the market in 2011, the shine has again worn off electric vehicles. High profile failures, such as the bankruptcy of charging infrastructure company Better Place, and poor sales of the vehicles themselves have bolstered the opinions of naysayers, who have variously referred to electric vehicles as “welfare wagons” and “green carpetbagging“.

But I would argue that we’re simply at the beginning of a journey: electric vehicle (EV) technology will one day have a meaningful role in a more sustainable transport future.

In line with a report released by the Victorian Government on World Environment Day, I can point to a body of both theory and evidence that allows me to make this claim with confidence.

In 1962 Everett Rogers released his seminal work, Diffusion of Innovations. In it he describes how the adoption of new technologies follows a trademark S-curve – a theory that has been proven to be correct for numerous innovations over the past century.

Rogers' technology adoption curve, where the brown line depicts the increase in market share over time, and the green/blue line depicts the distribution in market share amongst buyer types

Rogers’ technology adoption curve, where the brown line depicts the increase in market share over time, and the green/blue line depicts the distribution in market share amongst buyer types

Technology adoption curves for a range of modern innovations

Technology adoption curves for a range of modern innovations

Electric vehicle technology is on this journey. It is worth remembering that Australia’s first mobile phone and supporting cellular network were launched in 1987. At around $11,000 in today’s terms, the Walkabout TM was about the size of ten smartphones and had an hour of talk time between recharges. Seven years later the one millionth subscriber joined the network, and by 2007 subscriptions outnumbered people in Australia – 20 years after launch and not without some challenges along the way.

An important feature of this theory relates to the early adoption phase before the technology provides a financial return for adopters. During this phase, uptake is driven by the social prestige accrued by “early adopters”; after all, people are human rather than reliably rational economic beings.

Early adopters make purchase decisions the majority would view as crazy, so this phase of new market development is often portrayed with disdain for the innovation. In this phase you’ll hear a lot about high prices, low sales and proof that the innovation is a bad idea.

The longer-term view would recognise this as an unavoidable stepping stone in the adoption of new technology. Continued investment, innovation and effective marketing are required to move along the adoption curve, particularly in the lead-up to the “take-off point” for mainstream market adoption.

In the case of electric vehicles we may already be in sight of take off. California, the most advanced electric vehicle market in the world, benefits from investment by both state and federal governments who offer purchase subsidies. Combined with the effects from global investment in design and manufacturing, Californian car-buyers can now get behind the wheel of an electric vehicle for the same price as a gasoline (petrol) equivalent. Californians buy one in three plug-ins sold in United States, despite buying only one in ten vehicles overall.

Electric vehicle sales are increasing as awareness and understanding grows about their suitability for most driving tasks. At the start of this year the US Department of Energy compiled sales numbers that showed plug-in vehicles are well ahead of those of hybrid vehicles when compared at the same point in time from their introduction to the market. Note also how the resultant chart below resembles the start of those describing the theory and history of technology adoption shown above.

Plug-in Electric Vehicle (PEV) sales compared to Hybrid Electric Vehicle sales over the 24 months following their market introduction (US DoE)

Plug-in Electric Vehicle (PEV) sales compared to Hybrid Electric Vehicle sales over the 24 months following their market introduction (US DoE)

The good news doesn’t end there. After years of being pilloried as a prime example of the Obama administration’s cleantech incompetence, high-end electric vehicle company Tesla recently paid back their US Government loan nine years ahead of schedule. Investors clamouring for a piece of the action drove Tesla shares up to the point where the company valuation was 25% of General Motors.

And this momentum seems unlikely to stall. Industry reports suggest that 19 new plug-in models from 15 manufacturers are scheduled to be introduced to the US market in 2013-14. The increased availability of public charging infrastructure, especially in workplaces, will convince more and more car buyers to say “goodbye to gas“.

But what of Australia, where plug-in vehicles sales appear to be stuck in neutral?

Hope exists for our infant electric vehicle market, primarily through the spill-over benefits from uptake elsewhere. As more plug-ins are sold globally, costs will come down – so long as manufacturers bring their products to our shores.

Economic modelling from the Victorian Government has shown the most prudent path to be one where other markets bear the “first-mover” costs before we make the switch to electric vehicles once they make financial sense. But the real world is not an economic model and so more needs to be done to protect and enhance our economic competitiveness.

Mandating the installation of electric vehicle charging circuits in new housing developments is a low-cost intervention that the same modelling shows makes sense right now. For around $100 in parts and about the same amount in labour, a new home can be made EV-ready for about one-tenth the cost of a retrofit. If building rating schemes clearly recognised this, it could convince developers to make these installations where otherwise they are not.

Commitments such as these may help persuade vehicle manufacturers to bring plug-in models from their global portfolio into the Australian market.

And if we’re going to be car dependent, let’s make it easier to move towards lower cost, more environmentally friendly vehicle options.

Where it all begins – the IPAT equation


A way-out visual depiction of ‘our environmental responsibility’

So why am I such an advocate for technology solutions?… this post provides a ‘first principles’ type explanation.

The Jeffrey Sachs book from which I’ve taken the quote in my first post makes reference to a simple equation first published in the 1970s that sets out mankind’s impact upon the global ecosystem as a product of the number of people, their individual consumption, and the resource intensiveness of the technology they use:

I = P x A x T   (a.k.a. the ‘IPAT’ equation)


  • I = Impact upon the environment
  • P = Population
  • A = Affluence (which can be thought of as per capita GDP)
  • T = Technology (measured in terms of resource intensiveness)

Sachs suggests a modification to this equation that recognises the role of ‘clean technology’ in reducing mankind’s impact upon the environment:

I = (P x A) / S

where S = Sustainable (clean) technology (or technology with lower resource intensiveness than the incumbent)

Put simply, by increasing the use of clean technology, our impact on the environment can be maintained/reduced even as population and our standard of living increase – this idea underpins not only this blog but my entire working life.

Notably, the theory is not without its detractors.  One of the original authors of the IPAT equation contests the ability of clean technology to combat concurrent increases in population and standard of living.

While Sachs sets out a compelling vision for stabilisation of the world’s population, many examples exist of where economic development (or improved standard of living) is driving potentially catastrophic impacts upon the environment.

A recent example from China related to Beijing’s abominable air quality.  While there is an interesting back-story relating to air quality reports from the U.S. embassy contravening the official line being presented by the Chinese government, I can say from having visited Beijing in 2005 that the air quality was appalling by Australian standards – black lines of soot formed underneath my nostrils from simply breathing the air, even during summer when it was supposed to be better (they burn coal for residential heating during winter).

At the heart of Beijing’s air quality problems is the economic development that is resulting in pollution from industrial and transport activity along with dust-storms arising from deforestation of the surrounding countryside.  The government have basically said that economic development is the overriding priority, even if the improved living standards this delivers are being offset by the reduced living standards that accompany poor air quality.  In other words, they’ll get rich or die tryin’…. (cheers Fiddy).

If Sachs (and my adopted) theory is correct, the Chinese will be able to address their air quality issues without sacrificing economic development through increased use of clean technologies such as:

  • Cleaner vehicles (primarily through emissions standards but also through electric vehicle uptake)
  • Cleaner factories
  • Improved agricultural practices (such as GM crops)

Given the proven ability of the Chinese to implement change quickly as an outcome from their central decision-making, this is a case study worth watching (so long as their clean technology includes coming clean about the actual air quality…).