Buses

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Better Batteries for Hybrid Buses

The TTC’s supplementary agenda for this week includes a report on the settlement of negotiations with Daimler for the problems with the hybrid bus fleet.  Parts of this report are confidential, but the main items of interest for system users are in the public report.

  • The existing fleet of hybrid buses will be converted from lead acid to Lithium-Ion batteries.  This is expected to greatly improve reliability and to reduce fuel consumption by about five percent due to the much lower weight (4,100 vs 1,000 pounds) of the batteries.  (The TTC quotes the weight in pounds.)
  • The 2009 bus order for 130 hybrids will remain in place.
  • The optional 2010 bus order for 120 diesels will proceed.  It should be noted that supplementary Federal funding for “green” bus technology is not guaranteed into 2010.
  • Due to the larger than expected number of vehicles required both for construction projects (e.g. St. Clair) and to compensate for poor hybrid reliability, 52 “retirement-eligible” GM buses will undergo a life extension.  This is expected to add 2 to 3 years to their life.  Buses now out of service will be the first to go through this rebuild so that the active fleet is not further depleted.  This project will cost $3.5-million or about $65K per bus. 

From a budgetary point of view, the total spending remains below the original Capital Budget mainly due to the savings on diesel versus hybrids on the 2010 bus order.

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Diesels, Not Hybrids, At Least For Now (Updated)

Updated October 23:  The TTC amended the staff recommendations by adding two clauses, roughly as follows:

  • The TTC should withhold award of the optional 120-bus add-on order for clean diesels with Daimler Buses until the problem with batteries on the existing fleet are resolved.  If this is not done, the TTC should go with an alternative supplier.
  • The TTC should investigate conversion of the 2009 bus puchase from Hybrid to Clean Diesel.  Staff should explore the options for contract termination as well as the impact of the technology change on funding from various sources.

It is unclear how the first point can be achieved given that the cutoff date for exercising the existing contract’s add-on provision is October 31, 2008.

At this point it is clear that the 2010 bus order will be diesel, and there is a strong move to convert the 2009 order as well notwithstanding possible advances in battery technology.

Continue reading →

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The Economics of Hybrid Buses

The City of Toronto’s Executive Committee agenda for October X contains a report on the City’s Green Fleet Plan for various agencies.  By far the biggest of these is the TTC, and in an accompanying report, we learn just what the economics of the hybrid bus fleet are.

On page 15, the TTC presents a chart showing the fuel efficiency of its fleets, and it is worth noting that fuel consumption per vehicle km is rising at the same time as the average capacity of the vehicles is falling.  This is partly due to the additional systems, notably air conditioning, that are present on newer vehicles.

Of the total fleet, just over a quarter (450 out of 1653) are hybrids, and these consume about 10 percent less fuel than their pure-diesel cousins (based on experience to date).  This implies that the increased fuel consumption on the diesel fleet is even higher, proportionately, than the consolidated figures imply because of the offsetting benefit of the hybrids.

In the longer term, the relative fuel savings of hybrids may rise as they operate on routes with dense, stop-start traffic where the benefit of electric propulsion and battery energy storage will shine.  Nonetheless, there will be a considerable net cost of owning hybrid buses relative to diesels over their lifespan.

The TTC expects to spend $110-million on diesel fuel in 2009.  This includes a saving of $3.6-million for the existing hybrid fleet, and that saving will rise to somewhere around $6-million annually by the time that the fleet is about 50% hybrid (854 out of 1864) in 2011.  That’s a per vehicle saving of  about $7,000 per year.  We do not know yet what savings, if any, on maintenance will accrue to the hybrid fleet.

The capital cost premium for a hybrid bus is about $200,000, and the hybrid saving is only about 3.5% per year on this additional investment.  In time, if the capital cost premium comes down, the cost of fuel goes up, or the average percentage saving across the fleet rises, the numbers will converge and the rate of return will improve.

Meanwhile, it’s a shame we don’t have comparative figures for the cost of trolleybus infrastructure for our major routes.  Two decades ago, the TTC sacrificed its trolleybus system on the twin altars of environmental responsibility and natural gas buses.

Postscript:  The supposed economic advantage of natural gas as a fuel was almost entirely due to the fact that it was not taxed.  A large chunk of the TTC’s annual fuel bill is in tax paid to the Province of Ontario.  Without this tax, the economics of buses in general would be rather different.  Oddly, because the dollar saving from reduced fuel consumption would actually be lower without the tax, the economics of hybrid buses would look even worse if this tax were rescinded.

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The Myth of Fuel Cell Buses (2)

Recently, I wrote about the proposal by one neighbourhood group at the waterfront to use hydrogen fuel-cell buses in place of LRT.  Many thanks to all who contributed feedback to that piece.

This item contains a lot of technical bumpf and calculations.  If anyone finds an error in this, please let me know and I will be happy to correct it, even if that worsens my own argument.  I would like some real information to be “out there” on the issue rather than a lot of hype. Continue reading →

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The Myth of Fuel Cell Buses

There are times that the hot air surrounding transit technology forces my hand, and I have to take a stand on what really should be a marginal, non-starter of an issue.

In reviewing possible transit services in the eastern waterfront, one group, the Central Waterfront Neighbourhood Association (CWNA), is advocating not just that we use buses in place of LRT, but that we use hydrogen-fuelled buses.  Their presentation material includes a PowerPoint from Ballard Power Systems who have been trying for years to make a go of this technology. 

According to a Ballard press release dated October 23, 2006, there are only 36 buses operating worldwide that have, collectively, operated over 1.5-million km of service.  Let’s put that in context.  In 2005, the TTC bus fleet averaged just under 70,000 km/vehicle, or 2.5-million km for 36 buses.  That is over 60% more than the total mileage operated by all of the Ballard buses running worldwide.

Meanwhile, worldwide interest is focussed on hybrid diesel-electric buses on which a diesel generator powers an electric motor through a power storage system.  Hundreds of these vehicles are running in many cities, and the TTC already has 90 of its first 150-bus order in service.

There is no question that small-scale trials of hydrogen buses have been undertaken in many places, but it is unclear how this technology will stack up against diesel hybrids, especially considering that far more work is underway to produce hybrid buses that do not require the special fuelling facilities of hydrogen. Continue reading →