power demand reduction efforts in SA

South Africa's Western Cape Province is set to deliver solar water heaters to reduce energy demand. Environment, Planning and Economic Development MEC Tasneem Essop, and Minerals and Energy Minister Buyelwa Sonjica, have announced the launch of a solar water heater project that will roll out 1 000 geysers and establish a training academy to establish a pool of installation contractors.

Meanwhile the City of Johannesburg mayor Amos Masondo has said the city would install 10 000 solar water heaters, distribute compact fluourescent light bulbs, instal geyser electricity controls, and use solar-powered traffic lights* to help reduce the city's peak power demand of 3 500 MW. Together, these initiatives are expected to reduce peak demand by 325 - 475 MW at a cost of R397 - R577 million. That's somewhere in the range of R1 - R2 million per megawatt saved. In contrast, the Medupi coal-fired power station being built in Limpopo Province will cost at least R15 million per megawatt of generating capacity - proving yet again that reducing power consumption is far more cost-effective than increasing supply.

*After testing locally-manufactured solar-powered LED street lights, manufacturing company Broadwing Technologies figures retrofitting street lights could save 1 MW for every 12 000 to 15 000 units. Johannesburg has more than 140 000 conventional high pressure sodium and older mercury vapour street lights that could be converted.

dwell lightly

As a great example of re-using waste, Dwell shows how to make a chair from cardboard boxes. Not what you'd call elegant, but if you've moved house recently, you could fill an auditorium with these babies made from the packing boxes.

Afromusing highlights a few green gadgets from DEMO 08 last month in California, including Green Plug, eliminating the need to buy, carry and dispose of multiple chargers for all the electronic devices you use to enhance life in your cardboard chair.

And Inhabitat reports on New York's first Greener Gadgets 2008 conference this month. In case you still need a reason to buy the Green Plug.

Being the responsible citizen you are, if you manage to tear yourself away from your gadgets, maybe you should have a Tesla Roadster in the garage. Greencars reports on real-world testing of this rare set of wheels.

Or if you feel like something a bit more energetic - but not too much - how about an electric bicycle? Seen in Cape Town!

[Update: How green is the iPod? From Exploratory Design, which is "about latching onto the process and exploring it to no end."]

thinking outside the closet

Millions of people still don't have clean drinking water, yet in modern cities we flush literally gallons of it down the toilet every time we go for a pee. This should be a crime.

There are lots of examples of low water toilets, dual-flush toilets, composting toilets, and waterless urinals. There are even incinerating toilets for those who dare. Here and there, these end-user technologies are adopted voluntarily or with incentive subsidies, but they are not being used in sufficient numbers to offset growth in demand for water. We seem to be stuck in the pilot project stage, meaning "Hey, I wonder if this thing works?". Of course it bloody works. Just do it. We don't have to go completely waterless, but there is no reason for any toilet to use more than six litres a flush.

But we should be beyond that by now, and here's why.

inconvenient realities

From the San Francisco Chronicle:

1. Building a new "green" house has a bigger (negative) impact than making an existing house more energy-efficient.
2. CFL lightbulbs use less energy than incandescents, but as a product they pollute more (they contain mercury). LEDs are better, but too expensive and difficult to find.
3. In some places you can get a rebate for installing energy-efficient appliances, but this encourages us to send old appliances to landfills.
4. The carbon impact of manufacturing new triple-glazed windows can be bigger than the benefit in heat savings.

This does not mean we shouldn't make low-carbon choices. It does mean that every decision involves a tradeoff. This applies not only to individual householders, but also to city planning processes. One reason why planning needs to be integrated across government departments (and various other stakeholders) is that sometimes, the best plan overall will require some aspects of the plan to be suboptimal.

For example, city planners may decide that they want to encourage high densities in residential areas in order to achieve economies of scale in the provision of bulk services (water, sewers, and so on) and to increase public transport ridership. But in some areas the targets may not be achievable because developers are not prepared to build to the target densities, or for some other reason. Then planners may need to work with lower densities, and focus instead on arranging the orientation of streets and buildings so that buildings can incorporate passive solar design and rooftop photovoltaic panels for micro generation of electricity - something that is harder to achieve in high-density areas.

This strategy would require, as a minimum, interaction between the spatial planners, urban designers, traffic engineers, land developers and the local power utility. If these players are working in isolation, as they so often are, then the strategy won't work. In planning a low-carbon world, as with so many other things, there is no universal strategy. There are, perhaps, general principles that can be used to guide decisions, but reaching appropriate decisions requires a coordinated approach.

going cordless

When we moved to our house a year ago, we felt that one easy way to improve the way we consume energy was to go cordless. We didn't have many power tools, so the idea was that whenever we bought one it would, if possible, be cordless. The idea was that by using stored energy, we could recharge during off-peak times. Here in Ontario, the power company has not started metering according to the time of use, but there have been murmurings that they would, and I believe they should. Reducing peak demand could be a significant component of the provincial government's current strategy to eliminate coal-fired power stations. Using cordless tools, we are also ready to recharge with electricity from solar panels, if we ever get enough cash to go that route.

The biggest cordless electric item we have bought is a lawnmower, and I am happy to report that it does the job reasonably well. It's quieter than gas mowers, and doesn't pollute the neighbourhood. It is not pollution-free, since the electricty we are using is not green, but my guess - and I could be wrong - is that even coal-fired power stations have lower emissions from generating the amount electricity we use to cut the grass than are produced by the millions of gas lawnmowers brought out every week. I am not in favour of coal-fired power, but at least cordless lawnmowers can reduce peak electricity demand and can make use of energy sources that are not derived from fossil fuels.

There was only one model to choose from in our area: the Yardworks 24 volt 19 inch mower. By my calculations, it does about 9,000 sq ft on one charge if I keep the grass cut regularly. Unfortunately we have around 10,000 sq ft of lawn, but our plan is to drastically reduce that, replacing some of it with productive areas (vegetables) and low-maintenance indigenous plants that don't require watering (another topic for another day).

Update on 4 June 2007: And now you can ride it!

Update on 28 Feb 2009: The Brio cordless electric is now available in South Africa.