The recent purchase of solar panels by the school district is an excellent example of the conflict between good intentions and insufficient data.
In a world where burning fossil fuels are responsible for two-thirds of global electricity, solar panels mark a significant reduction in greenhouse gas emissions relative to these sources. However, we need to consider the creation of our sources of electricity every bit as much as their operation, and we also need to compare those numbers with similar calculations for our existing supply.
While the IPCC data regarding lifecycle emissions for solar panels is slightly dated, values range from 30 to 80 grams of carbon dioxide per kilowatt hour for most studies, and a recent NREL estimate was about 40. The manufacturer, to be fair, seems to be making efforts to further reduce that number.
Hydroelectric power is the source of about 95% of the electricity we consume in B.C. The energy mix powering the factories which manufacture solar panels will determine if they are greener than BC Hydro, not the technology itself.
We are better served when decisions do not start from a deeply held belief that we seek to bring into the world, but a thorough investigation of data that seeks the best possible result. If the logical conclusion clashes with our expectations, so much the better. Analytical rigour will lead to the implementation of policy that aligns our aspirations with our actions.
It may very well be that over the lifespan of the technology that savings are accrued, but the environmental impact is one that will likely result in more carbon dioxide being put into the atmosphere.
Scott Harrison
Qualicum Beach