Making sure your home is not an energy sink - I

Science Alert | It makes no sense to turn off a light when you leave a room in which an electric heater has been left on. The power used by the light is 100 watts (W), while a heater typically draws 2000 W.

How big a yardstick is 100 W? Let’s assume that we leave a 100 W light globe on every night for six hours, which adds up to 2200 hours a year.

To calculate the energy used – measured in watthours – over the year, we simply multiply the hours by watts, which in this case is 220 000 watt-hours (Wh). As we know, ‘kilo’ means ‘thousand’, so a more manageable way of expressing this figure is 220 kilowatt-hours (kWh).

To most people, including me, a number like 220 kWh doesn’t mean much, so let’s convert it into something familiar – say litres of petrol – as an energy equivalent.

The best efficiency that can be achieved by burning brown coal to generate electricity is 25 per cent. This means four times the energy that comes through your electricity meter or power point is required to produce the energy you use in your home.

Taking the above example: 4 x 220 kWh, or 880 kWh, is required to produce that amount of electricity. If we go a step further, a litre of petrol contains about 10 kWh of energy. Thus, the 880 kWh equates to 88 litres – enough for the average car to drive 880 km, or from Melbourne to Sydney. That’s just to run one light globe each night for a year!

What Now? - Goal State - The 2000 Watt Society

originally posted 11/08/07 - reposted in January 08, and now reposted for the third time with updated links in the context of discussion of "what now?" change agency and coalition building:

The "2000 Watt Society" is a radical model of efficient, high-quality living being pushed by the Swiss Council of the Federal Institute of Technology. Worldwide average energy consumption per capita is about 17,500 kilowatt hours, working out to a continuous consumption of 2000 watts. But as we all know, that per capita consumption is not evenly distributed. Switzerland, efficient for Europe, uses around 5000 watts per capita; Europe as a whole, about 6000 watts per capita. Developing nations use substantially less -- the average for Africa as a whole is about 500 watts per capita. The US, conversely, runs about 12,000 watts per person. The Swiss Council wants to move the nation as a whole towards a 2000 watts per person goal, not by cutting back on the Swiss standard of living, but by dramatically improving the energy efficiency of all aspects of life.

A document entitled "Smarter Living" (PDF) lays out the details of the agenda:

Cuba's Urban Agriculture

These two documents are excerpts from a Master of Arts thesis completed in 2004 by Janine de la Salle (author) at Dalhousie University in Halifax under the primary supervision of Dr. John Kirk as well as Dr. David Patriquin and Dr. John Devlin. These particular portions of the thesis were selected on the basis that they had the most discussion and description of urban agriculture (UA) in Cuba during the past 15 years in conjunction with a detailed historical context of food security and public policy in Cuba since the beginning of the 20th century. The historical excerpt helps to set the tone for contemporary developments in Cuban food security such as the emergence of UA and is therefore essential. The gist of the entire thesis is given below as the "Thesis Abstract". If you have any questions about this material please contact the author at jsalle@dal.ca (Market photo linked from Havana Journal.)

Until we see a candidate for elective office make the 2000 Watt society and renewable and sustainable urban agriculture the centerpieces of his/her platform, we can conclude in full certainty that these candidates are not meaningful change agents and are fiddling while "Rome" burns - whether out of personal and idiosyncratic ignorance, or because they've been enlisted and handsomely compensated to play a distracting and misleading role - while the wizards of woe continue doing what they know how to do best.

I mean really, what good is a professed change agent who doesn't have a clue about what needs to change, or, lacks the organizational and operational skills, resources, and required authority to implement meaningful change?


On their Leavenworth County farm, Jeff and Pam Meyer of Cal-Ann Farms, above, raise tilapia in a former dairy barn. The nutrient-rich fish wastewater is used to grow 10 varieties of peppers, left. But the farm’s signature crop is basil, top, which the Meyers grow hydroponically.

An applied instance of local change agency requiring knowledge, skill, ability, and a viable social network to help it achieve its promise.