We bought our lovely blue Prius hybrid because it’s environmentally green. If the recently-announced plug-in version had been available we’d have considered that too, but we already have a great plug-in hybrid vehicle. It’s enormously greener than any Prius will ever be, and it’s greener than all-electric cars like the Nissan Leaf and Chevy Volt as well.
My preferred commuting vehicle has a 355 Watt-hour battery, but the primary engine is me because it’s an electrically-assisted bicycle. Some question the environmental sensibilities of cyclists who commute with electric batteries and motors on their bicycles. Many of those doing the questioning commute via Prius themselves; many more commute in vehicles that are a lot less green. Good-quality electric bicycles typically use the same kinds of batteries as hybrid-electric and all-electric cars, so let’s compare the environmental burdens posed by the batteries in each kind of vehicle.
My electric bicycle uses a lithium-based battery similar to the one planned for the plug-in Prius. It has a reasonably typical 355 Watt-hour capacity. The older-style nickel metal hydride battery in today’s hybrid Prius has capacity of 1,310 Watt-hours, enough for some 3.7 electric bicycles. (Some cyclists use cells from salvaged Prius battery packs to power their electric bikes today — they’re pretty good.) Most auto trips still carry a single occupant, and the same batteries that can help move one car and driver could help move more than three times as many cyclists. Bicycles take up much less room on our public roads than cars and require vastly less energy and materials to manufacture. They consume much less energy overall, and unlike sitting in a car bicycle riding actually contributes to public health. I use approximately $0.03 worth of electricity on a relatively long 28-mile round trip electrically-assisted bicycle commute.
But consider the plug-in version of the Prius. Toyota has announced that its lithium-based battery pack will have a 5,200 Watt-hour capacity, enough to power about 15 reasonably typical electrically-assisted bicycles. 15! If folks who are willing to pay the added costs of plug-in hybrid cars are considered environmentally virtuous, what shall we say for folks who are willing to pay the added costs of expanding the range and versatility of their bicycles by adding 1/15th the battery capacity of a plug-in Prius to their own hybrid-electric rides? Surely the public infrastructure costs of a few extra bicycle racks and improved bike lanes pale before the costs of expanded electric power transmission capacity and dedicated charging facilities for electric cars. And surely the impact of increased electric bicycle demands for the lithium batteries and the resources used to create them will be trivial compared to the impacts of increased demands from plug-in hybrid and all-electric cars.
For comparison, the forthcoming all-electric Nissan Leaf will have a 24,000 Watt-hour lithium battery pack. It’ll be a real step forward for reducing auto tailpipe emissions, but that same battery pack would power 68 electric bicycles! (At 16,000 Watt-hours, a Chevy Volt would power 45.) Wouldn’t it be good public policy to ensure that a significant share of those lithium battery cells are used on efficient, compact, light-weight electric bicycles instead?
We’re not ready to sell our Prius, but these comparisons put the environmental footprint of electric bicycles in a whole new light. If even a tiny fraction of cyclists use electrically-assisted bicycles as alternatives to cars the public benefits can be very real. It’s past time for nationally-consistent guidance encouraging the use of electrically-assisted bicycles in the U.S. Let’s help get a few more people out of their cars – hybrid, plug-in, or otherwise — and on to their bicyles!
Please join us in our forums at http://electriccyclist/forum to carry on this conversation and encourage support for the expansion of the electric cycling community in the U.S. (Alternatively, come and see how many electric bikes you could power with the battery pack from a single Tesla Roadster.)
[...] as commuting vehicles than by shifting to plug-in cars (hybrid or otherwise.) Have a look at Greening the Planet: Why the plug-in bicycle beats the plug-in Prius and all-electric cars to see how many e-bikes you can power with a Prius battery pack, plug-in or otherwise. (You do [...]