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A Tale Of Two Stations

Install more parking at commuter rail stations, not just solar panels.

I love me a good solar panel. I have them on my house and on my calculator. And, I’m enthusiastic about what is happening to costs of renewable energy. The future for renewables is bright and it cannot come soon enough. I am massively in favor of large, utility-scale solar and wind installations and look forward to my engineering friends figuring out grid–scale, economically-competitive storage solutions.

I also love truffles – yes I am a food snob. On pasta, they are amazing. But there are other places, where they simply have no place. The same is true for solar panels.

What am I talking about? I take BART (the Bay Area’s commuter rail, which would not exist without the seminal analysis by Dan McFadden) to work. I almost dropped my Kindle when I saw that my local BART station replaced its massive parking lot with car ports covered in solar panels. The local Tweetosphere is full of group hug messages about how warm and fuzzy it makes us feel that our Teslas are now covered by shade providing solar panels. Big banner ads push this even further by stating that the solar panels generate enough electricity to power 200 homes.

So what is my gripe? We live in carmageddon. Traffic in the Bay Area is at an all-time high. 40% of California’s greenhouse gas emissions are generated by vehicles. If we are going to tackle this problem we should incentivize people to take public transport. Parking at my station in Lafayette, a wealthy little California town, fills up by 7 am at the latest. No more parking. So people drive.

What could one have done? One could have built a 4 or 6 story parking structure on the existing footprint. This would have at least quadrupled the parking capacity without changing the footprint. How much energy would that save, assuming people would opt to BART to work instead of drive if they could find a parking spot? Right now, there are 1629 spaces on a flat parking lot. Assume an average fuel economy of 24 mpg per car. Assume that most people have a commute to SF of 22 miles each way. So let’s call that two gallons per car per day. Assume three additional floors of parking, or and additional 4887 parking spaces on the current footprint. That makes 9,774 gallons saved per day. Let’s compare that to the energy the average California household uses per day – roughly 170,000 Btu (according to the EIA). There are roughly 110,000 Btu in each gallon of gasoline. So each day the solar panels provide the energy equivalent of 170,000 Btu/home* 200 homes = 34,000,000 BTU. The gas savings are, drum roll, roughly 1 billion BTU per day. A thirty fold difference. Mic Drop.

For comparison, the Walnut Creek Station (right next to Lafayette), just put in a multistory parking garage and ample locked bike parking. It’s full at all times as are the bike lockers. Go Walnut Creek! Also, Walnut Creek has encouraged the development of multistory apartment buildings in walking distance to the BART station. This would enable the Kombucha-sipping, CBD-vaping generation to walk to BART and get to work without ever worrying about a car.

Further, my simple calculation above does not even take into consideration the congestion externalities these parked cars no longer cause, the local pollution that does not end up in kids’ lungs and the safety consequences of having more cars. Of course I understand that dispatching more trains is a hard problem and increasing the capacity of local rail systems is not straightforward. BART is working hard on a better future. But failing to increase parking capacity and putting band aid solar panels on top of single story lots is just silly. Put those panels on top of a six floor parking garage and then advertise savings if you have to.

Of course, there is always the NIMBY issue of land use restrictions. The rich people of Lafayette probably don’t like the increase in local road traffic driving to BART and multistory structures might be visually offensive. If we are going to make real environmental progress, we’ll need to get beyond warm glow to hard numbers.

Keep up with Energy Institute blogs, research, and events on Twitter @energyathaas.

Suggested citation: Auffhammer, Maximilian. “A Tale Of Two Stations” Energy Institute Blog, UC Berkeley, May 28, 2019,


Maximilian Auffhammer View All

Maximilian Auffhammer is the George Pardee Professor of International Sustainable Development at the University of California Berkeley. His fields of expertise are environmental and energy economics, with a specific focus on the impacts and regulation of climate change and air pollution.

19 thoughts on “A Tale Of Two Stations Leave a comment

  1. Ham radio operators use morse code. You can find me on 7053 kWh each morning at 5 to 6 am central daylight savings time. Call K5GP and I will reply if I hear you.

  2. Thanks for sharing! Interesting article. Solar does sort of make the place they are installed immovable – definitely important to look at each place on a case by case basis.

    • Well, if people really didn’t want to ride trains, why does parking fill up before 7am? We call it excess demand. You know, when’d demand exceeds supply. I am not arguing that everyone is supposed to shift to rail, but there are plenty of people who do, but can’t.

  3. This is a phenomenal post.

    On Tue, May 28, 2019, 3:02 AM Energy Institute Blog wrote:

    > Maximilian Auffhammer posted: “Install More Parking At Commuter Rail > Stations, Not Just Solar Panels. I love me a good solar panel. I have them > on my house and on my calculator. And, I’m enthusiastic about what is > happening to costs of renewable energy. The future for renewables is b” >

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