Tom Konrad CFA
Stop debating the viability of
electric cars, and work on fixing our broken transportation
paradigm.
My friend and colleague John Petersen has it in for the electric
car. Recently he wrote a summary of his anti-electric car
views,
entitled "
It's
Time
to Kill the Electric Car, Drive a Stake Through its Heart and Burn
the Corpse." Did I mention he also has a flair for the
dramatic?
Many electric vehicle (EV) advocates, or "EVangelists," as he calls
them, have tried to refute his arguments.
One of
the
more coherent attempts was "
Tesla
and the Future of the Electric Car,"
which I recently reprinted as a guest article on AltEnergyStocks.
Innovation
I personally find both arguments incomplete. Petersen has a
strong libertarian streak, and the thought of wasteful subsidies
drives
him to distraction.
EV
subsidies top his list of pet peeves, although he's curiously
a
fan
of
government meddling in the transportation market when it comes to
CAFE standards. The EVangelists often correctly point
out
that Petersen is overly pessimistic about innovation, but they focus
too much on the potential of innovation to reduce the price and
increase the durability of vehicle battery packs. Yet even the
true battery experts are
skeptical
of
the rapid advances in batteries EVangelists predict. I
find both sides to be too focused on "winning" the argument when
what
we all should be doing is trying to overcome the very real economic
barriers to EV adoption.
Like the EVangelists, I believe in the power of innovation.
But
it is the nature of innovation to appear where it is least
expected. Battery technology will advance, but the innovations
which reduce our dependence on fossil fuels for transportation need
not
be innovations in battery technology. Innovations to our
mobility
system have the potential to reduce the use of oil far more quickly
than than improvements in batteries, even while battery innovation
will
continues. Such innovations are likely to include potential
better battery chemistries and manufacturing, as well as
improvements
in the rest of the battery, such as
better separators, or other
changes most of us have not yet thought of.
Systems Thinking
Those battery innovations we can foresee will only bring marginal
improvements to battery performance. As energy efficiency
professionals know, giant qualitative improvements come not from
replacing a building's components with more efficient ones, but by
redesigning the whole system with energy use in mind. The same
is
likely to be true in our transportation system: just replacing
internal
combustion engines (ICE) with electric motors leaves all the
potential
gains from system improvement on the table.
To get some idea what sorts of system changes may be effective, it
helps to understand the costs of our current car paradigm, and why
simply replacing the ICE with electric drive alone is unlikely to
lead
to the widespread adoption of EVs.
Most of the objections to electric cars, and certainly Petersen's,
focus on the up-front cost of the car, and the difficulty of paying
this back based on the lower operating costs of an electric
car.
The key to understanding EV economics (or "EVconomics") is that
compared to the cost of the fuel a gas tank holds over its lifetime,
it
is practically free, while the cost of a rechargeable battery is
comparable or even greater than to the cost of all the
electricity/fuel
it will hold over its useful life. While ICEconomics is all
about
the cost of fuel, EVconomics is about getting the most out of the
expensive battery, while the cost of the electricity to charge it is
relatively unimportant.
EVconomics
A car battery which is only recharged at night will be fully cycled
no
more than once daily, and probably much less if the car is not
driven
to its full range every day and may stay in the garage some
days.
Because of this, it seems unreasonable to expect an electric car
battery to go through more than 300 full charge cycles a year, while
200 full cycles per year is probably closer to the real world
average
for cars charged only at night. Since EVs get between 2 and 6
miles per kWh, while gasoline vehicles (not counting hybrids) get
between 15 and 40 mpg, I will use as an approximation that 1 gallon
of
gas can be displaced by about 8 kWh. That means that each kWh
of
a battery pack will displace approximately 25 gallons of gas with
200
kWh, and at most 38 gallons of gas with 300 kWh in a year's
use.
The following chart shows the number of annual savings expected for
each kWh of an electric car's battery for different driving/battery
recharging intensities.
If electric cars are to become truly mass market, they will need to
accommodate drivers who normally only use half of their potential
range
a day, and don't drive some days (for about 100 full charge cycles
per
year, represented by the yellow line) as well as the most intensive
users with 300 or more full charge cycles per year. The yellow
line only reaches breakeven over five years with the most optimistic
(many would say unrealistic) battery improvement scenario, and then
only with gasoline prices doubling to $9 a gallon, meaning that EVs
will not make sense for casual drivers any time in the foreseeable
future.
EVconomics of the Urban Commuter
Yet even EVangelists do not consider causal drivers to be ideal
electric car users. They tend to focus on the urban
commuters. Such urban commuters have regular commutes that
allow
them to use most of their battery range on a near daily basis (300
full
charge cycles per year, represented by the middle green line on the
chart.) For this group, a five year payback can be achieved if
we
assume battery prices falling to a more believable $750 per kWh and
gas
prices rising to a not-incredible $4.80 per gallon. Yet such
intensive usage might reasonably be expected to shorten battery
life,
meaning that a shorter three year payback might be needed to make
the
electric car economic. (Note that a battery's life depends not only
on
the number of times it is cycled, but the depth of those cycles, and
how long it is kept at full charge. Keeping a Lithuim-ion
battery
at
full
charge or fully depleted can be particularly damaging.) A three year
break-even would require either
a battery cost breakthrough and gas at $5.20, or significant battery
improvement and gas at $7.50 per gallon, which seems possible, but
is
not likely in the next few years.
In other words, without daytime recharging, significant increases in
the gas price and significant reductions in battery prices are
required
to make electric cars economic for even the most intensive
drivers. Only with daytime recharging and average usage of
more
than a full charge cycle per day (500 full charges per year) do EVs
begin to make economic sense with current ($4) gas prices and
($1000/kWh) battery prices. Current prices lead to a five year
breakeven at 500 full charge cycles per year, although some increase
in
the gas price or reduction in battery prices will probably be needed
to
accommodate the reduction in battery lifetime that would come from
such
intensive usage.
Societal Benefits and Costs
At this point, it would be easy to conclude that Petersen is right,
and
EVangelists are high on "hope-ium," since massive improvements in
battery economics or massive increases in the price of gas would be
required to make EVs economical beyond the small niche comprised of
vehicles that can be recharged frequently.
That conclusion would be premature, as it only considers the
economic
benefit of fuel savings as a possible motivation to buy an EV.
If
we were only motivated by economics, no one would ever buy a sports
car, let alone a Hummer. (Admittedly, no one is buying Hummers
anymore, but there was a time in the early 2000s when they were
wildly
popular.) Most people buy vehicles because of what the vehicle
says about them, not for the economics.
In addition to non-fuel economic benefits such as the possibility of
using EVs for grid services such as frequency regulation, and the
much
lower maintenance costs of EVs (bye-bye oil changes and
brake
pad
changes, not to mention trips to the gas station.) Even
if EVs are not lower cost than ICEs, they do a good job lowering the
volatility of fuel costs, which can be a significant help in
budgeting,
as monthly expenses will not swing wildly with the price of gas.
In terms of societal benefits of electric vehicles over conventional
vehicles, there are
- advantage that electricity is produced from domestic sources,
leading to increased economic growth
- the reduction of conventional pollutants in our cities leading
to
better health,
- less noise pollution
- the ability to use our existing electricity infrastructure
more
intensively and so get more value out of it
- The potential to reduce the cost of renewable electricity
integration.
On the other hand, EVs come with some cost as well. Lowering
the
unit cost of driving will encourage more of it, and while more
driving
brings marginal benefits to the driver, it also comes with costs to
society. Societal costs of driving include
- traffic congestion
- pollution (even if a vehicle is charged with renewable
electricity, that electricity could have been used to reduce the
use of
fossil electricity if it had not been used for driving)
- traffic accidents leading both to property damage and
injuries/fatalities
- increased road maintenance and construction costs
- The potential increases in the cost of electricity
infrastructure
(these may be minimal with smart charging, but could be
substantial
without it.)
Why Not Natural Gas?
I'm not swayed by arguments that it makes sense to subsidize natural
gas vehicles in preference to EVs because they currently are a more
economic solution. Natural gas vehicles are a band-aid
"solution"
to the problem of peak oil, as they depend on a limited fossil
resource. Natural gas vehicles only delay the day we will have
to
transition to renewable transportation fuels, and so the necessary
infrastructure for refilling natural gas vehicles will only delay
the
day that we shift to a truly sustainable transportation
infrastructure.
It makes sense for society to subsidize a technology to the extent
that
society benefits from that technology. Natural gas vehicles
lack
some of the societal benefits of EVs (the potential to lower the
cost
of renewable electricity integration, reduced noise,) and have more
societal costs, namely an increase in the price of natural gas which
will be a consequence of increasing demand. As such, the case
for
societal subsidies for natural gas vehicles is much weaker than the
case for subsidies for EVs.
The Right Sort of EV Subsidy
To the extent that the societal benefits of electric vehicles
outweigh
the societal costs, it makes sense to subsidize their
adoption.
Nevertheless, there are much better ways to do this than to
subsidize
the purchase of vehicles. Such subsidies will maximize
societal
benefit from EVs,
not
the
benefits to individual EV owners.
Any intervention to favor EVs should focus on maximizing societal
benefit, not benefits to individual users. From my discussion
and
chart above, it is clear that there are at least three possible
paths
to broad EV affordability:
- Increased gasoline prices would make EVs more practical by
increasing the incremental savings of using electric drive
- Breakthroughs in battery manufacturing and technology would
increase EV affordability by reducing the cost of batteries.
- Increased deployment of charging infrastructure would allow EV
owners to recharge more often and receive more benefit from each
kWh of
battery pack. This would in turn make EVs with smaller
battery
packs more practical, and bring down the overall cost of EVs.
- Funding EVs for public use.
We'll need to make significant progress on multiple fronts before
EVs
are truly competitive with fossil fueled vehicles. Note that
direct subsidies for the purchase of plug-in vehicles are
not in my list. That is because
the
benefits of such subsidies flow directly to the EV buyer, but do
much
less for society as a whole.
Increasing Gas Prices
Since driving carries external costs to society (congestion,
pollution,
accidents, and road maintenance), raising gas prices through a gas
or
carbon tax not only helps to make electric vehicles more affordable,
it
makes ICE drivers internalize some of those societal costs.
Yet
since many of these negative externalities of driving are common to
all
cars, including EVs, gas taxes are not the most efficient way to
address these externalities. A much better way in terms of
economic efficiency would be charges based on Vehicle Miles Traveled
(VMT), since fuel efficient vehicles (including EVs) create just as
much congestion, road wear, and as many accidents as inefficient
ones. The best argument for using gas taxes instead is simply
that we already have the mechanism in place, and therefor gas taxes
would be easier to implement than VMT charges. Gas taxes have
the
side effect of encouraging EV ownership, but they do nothing to
address
the societal costs of congestion, accidents, and road maintenance.
On the other hand, in the current political anti-tax climate,
raising
gas taxes is probably a non-starter, even if it were done in a
revenue-neutral way with the increased revenues being used to reduce
other, less economically efficient taxes. VMT charges might
actually be more politically acceptable, if they replaced existing
flat
fees (such as vehicle registration and insurance.)
Battery and EV Research
Scientific and technical breakthroughs often hold significant
benefits
for society as a whole, while investors are seldom able to capture
much
more than a small fraction of the benefits. Hence, it is easy
to
justify public funding of research into advanced batteries, since
better, cheaper, longer lasting batteries will benefit all of
society. Such research funding is likely to be money much
better
spent than subsidies for individuals buying plug-in vehicles.
Charging Infrastructure
As I demonstrated in my analysis of EV economics above, frequent
charging can greatly improve the economics of EVs. More
frequent
charging requires neither uncertain technical breakthroughs nor
politically intractable increases in gas prices. Subsidizing
the
deployment of a network of public charging stations also has much
broader benefits than subsidizing EV purchases, because public
charging
stations benefit current and future plug-in vehicle users, not just
the
individual EV owner who receives a rebate.
Charging stations on the fringes of the network bring benefits to
plug
in vehicle owners even if they are never used, because the existence
of
a nearby charging station gives an EV owner the confidence needed to
overcome range anxiety, and hence use more of a vehicle's battery
capacity on a given trip, and since such charging points are
unlikely
to recoup their costs through usage fees, subsidizing charging
stations
at the edges of the network is easy to justify because their
societal
benefits are high while their profit potential is low.
One charging infrastructure stock is
ECOtality
(ECTY), a
favored
electric car investment of Jeff Siegel at Energy and
Capital. Although I think electric vehicle infrastructure is
the
right sort of investment for society, I'm less sure buying this
stock
is the best idea for stock market investors. The company has
little debt, but is rapidly burning through cash, and seems to be a
long way from profitability, with a -127% operating margin (i.e.
they
are losing more money on every sale than they get in revenue, even
before paying for overhead.)
That said, ECOtality's prospects would be greatly helped if
government
did the right thing and shifted electric vehicle subsidies to
infrastructure rather than the purchase of cars. But my faith
in
government doing the right thing these days is quite low, given the
incredible level of partisan bickering, ideological grandstanding,
and
incredible idiocy which were recently on display in Washington in
the
form of a game of fiscal chicken played with the possibility of
default
by our so-called leaders on Capitol Hill in the debt ceiling debate.
Public Vehicles
If we are going to subsidize EVs directly, it makes much more sense
to
subsidize EVs used by as many people as possible, rather than those
owned by individuals. EVs in public transit make a lot of
sense
in this regard, since the benefits of lower operating costs flow not
to
private individuals, but to the all the users of public transit.
The other advantage of electric vehicles for public transit is that
many are well suited to electrification. Electrification of
rail
and trolley bus routes is economic on more heavily traveled routes,
as
many trains can share the same electric infrastructure. Such
routes could be extended short distances at fairly low cost by
adding
batteries to trolleys and electric locomotives to increase their
range
onto less frequently used routes without electrification. When
these trains or trolleys return to the electrified portion of the
route, the batteries could be recharged while the bus or locomotive
was
still in service, allowing many charge cycles per day, making this
sort
of EV economic even at current battery prices.
Giving car-sharing services such as
Zipcar
(ZIP)
incentives to use EVs may also make sense since these vehicles are
typically rented by the hour and return to a limited number of fixed
locations where charging points can be located. Measures to
encourage e-bikes among bike-sharing services make sense using a
similar logic. Although e-bikes have more associated emissions
than traditional muscle-powered bikes, the electric assist on
e-bikes
opens bicycle commuting to the less physically fit who might
otherwise
choose to use a car. If even one e-bike ride in five displaces
a
car journey, there will be a net benefit in terms of congestion and
emissions.
Conclusion
Electric drive technology, especially batteries, has not yet reached
a
point where EVs make economic sense when compared to traditional
hybrid
electric vehicles or ICE cars. Until it does, the primary
drivers
of EV adoption are likely to be the intangible benefits to EV
owners. Like sports cars and SUVs, EVs are most likely to be
bought by individuals who like what EV ownership says about
themselves. In this situation, it makes no more sense to
subsidize the individual purchase of EVs than it makes sense to
subsidize the purchase of granite counter tops.
Yet current economics of EVs do not mean that government cannot or
should not take useful measures to promote the transition from ICE
to
electric drive. Just because today's EV technology is not
economic in the context of our current transportation paradigm does
not
mean that EVs have no potential. Appropriate policy can ensure
that EVs both suceed and are a benefit to society as a whole.
Nudges such as VMT fees which reduce the societal cost of driving
and
encourage the use of alternative transport which is more suited to
electric drive are one example of such policies.
There are many useful niches for electric drive technology in
vehicles
that can be charged more than once a day, and better charging
infrastructure and support for battery research can make useful
contributions to making electric drive an economic and practical
part
of the solution to the challenge of peak oil which can also help
with
the challenge of climate change by aiding with the integration of
variable renewable energy into the electric grid.