Wednesday, March 30, 2011

I Hope This Brightens Your Day

After the earthquake in Japan and the crisis with the Fukushima Power Plant, I bet you thought I would talk about nuclear power in this post, but I decided to go a different route and talk about solar power. The article I found that prompted this week's post, actually talks about the Fukushima incident, but in respect as to how it affected solar energy.

If you have ever driven down 6th Avenue towards Denver, then you may have seen the photovoltaic cells, or solar panels, to your right, in front of the Federal Center. These panels convert the solar radiation from the sun shining on them into electrical current using semiconductors along their surface that exhibit the photovoltaic effect. This effect refers to the photons of light from the sun knocking electrons into a higher energy state, which creates the electrical current and, thus, electricity.

Since Fukushima, unease about nuclear energy has risen, resulting in an increased interest in solar and wind energy. Stocks in many solar companies have risen in the last few weeks, marking the added interest in the area, rising an average of 3.6% in the last week alone. Germany has also taken action to promote solar energy instead of nuclear, by planning on installing enough solar cells to generate 7.5 gigawatts in 2011. Also, they recently elected a Green party-led coalition over a Conservative party in one of their states as a result of anti-nuclear voters.

Wednesday, March 9, 2011

Hot Energy!!

I've been looking to write about geothermal energy for a while, but just haven't been able to find a good article to start it off, but today I found this article that I found pretty interesting. It is about Iceland's geothermal production, and how they plan to export the energy to mainland Europe. I knew that Iceland was a big user of geothermal energy, but I did not know that they used it to produce 81% of their electricity!!

Geothermal energy works by using the natural heat from Earth to heat water or another working fluid, and then the fluid is used to turn a turbine which turns a generator to produce electricity. It is not very efficient, only being at 10-25%, but as it uses heat from the Earth's core, it is a renewable source of energy, which makes it appealing. The figure to the left shows the basic dry steam plant, which takes geothermal steam directly to turn the turbines and produce electricity.

Currently, the United States is the world's largest producer of geothermal energy with a capacity of 3,086 MW per year, but it only accounts for 0.3% of the electricity produced in the U.S. Hopefully some of the money attributed to renewable energies in the budget, so that we can expand even more with geothermal energy.