Dead Bats

Whilst I might be a fan of taxidermy, bats and dead things, it is safe to say that this is not everyone’s hobby or pretty site. Furthermore animal protectors, vegetarians and all the other groups of people may be truly disturbed by deaths of animals due to humans even if its bats. Wind power is not always good and when I wrote my previous post about it, I did not seem to come across any major disadvantages however I have just stumbled upon a very interesting article telling me that wind turbines cause increased bat fatalities especially during mating season. Thinking about it logically, I am sure they also cause bird fatalities however in this post I just want to quickly express my thoughts about bats and summarize that article.

The article states that bats are dying in unusual number at wind turbines especially during low-wind conditions in the late summer and autumn. Tree bats species are the most susceptible to increased mortality rates hence it is assumed that this occurrence is due to the fact that bats are mistaking wind turbines for trees due to their limited day time vision and turbines being tall structures that remind them of trees. The article used thermal surveillance cameras that were installed on wind turbines to try perform a control experiment and observe the bats’ behavior to try work out whether these fatalities are actually influenced by the turbines. The article found that the speed at which the blades on turbines rotated effected bat behavior (Cryan, 2014). As the new modern turbines are very quiet as well, it increases bat fatalities as the sounds of blades rotating does not scare the bats away from turbines but if anything, attracts them to the turbines as the sounds remind bats of leaves and branches of the tree moving due to the wind. Bats reproduce in trees hence the attraction of bats to turbines to begin with. Further more ecological research suggest that bats can sense and respond to air currents and thus it is easier for them to yet again mistake the blades for tree branches. Whilst the article is uncertain about specific causes of why bats are attracted to turbines, it does seem to imply that they are and bat mortality is increased.

So from this information we can conclude that wind power generation can actually have some negative effects for the ecology and our environment and it is not a completely environmentally friendly method of producing energy. Bat deaths make me sad as I find bats a very nice little creature and hence below is a picture of a screaming businessman- one of Francis Bacon’s portraits that describes well my feelings about increased bat mortality rates due to our desire to produce energy.

Figure 1.

Source: Tate. “Study for a Portrait” or “Businessman I” or “Man’s Head” by Francis Bacon.

Wind Power

One of the sources of renewable energy is wind power. The energy contained within wind has been utilized by humans for thousands of years starting with transport where wind power was used to fill sails and make the ships sail and continuing with agriculture- in wind mills. Today, wind power once again, is becoming reality. Wind spins wind turbines and produces electricity, which is an alternative source to energy, which we mainly obtain from fossil fuels. Whilst wind power is not the main source of renewable energy today, the demand for it sure is growing. Figure 1 below shows where our energy came from in 2009.

 Figure 1.

Source: Renewable Energy Policy,2011. Renewable energy share of global final energy consumption and the different methods of obtaining renewable energies and their share.

Although wind power currently does not represent a significant amount of the world energy, Renewable Energy Policy Report produced in 2011 reported that the market for it is rapidly expanding and in 2011 for the first time ever recorded, the majority of new wind power capacity was added in developing countries and emerging countries such as China (Renewable Energy Policy, 2011). Prior to that, wind power is mainly used in European countries such as Denmark, UK and Spain, as well as in the USA. Wind farms are now seen both onshore and offshore and investments are made into more wind power plants. Figure 2 below shows the rise of demand and energy generated by wind power.

Figure 2.

Source: Renewable Energy Policy,2011. Wind power, existing world capacity, 1996-2010.

The video below explains how electricity is produced from wind turbines.

However whilst there certainly are advantages to obtaining energy using this method, there are also some disadvantages. Below I provide a list of advantages and disadvantages of wind power.

Advantages:

• ·      Wind turbines only use 1-10% of the wind areas which allows for farming on the surrounding land (Fthenakis, 2009)- much less land is required compared to say, biofuels production.
• ·      The turbines don’t require anything except wind power to keep them going thus no emissions are produced and they are very environmentally friendly. J
• ·      The energy used for the construction of a turbine is re generated by one turbine within 6 months.
• ·      The lifecycle of a wind turbine is 25 years thus it can produce a lot of energy in those 25 year where each turbine can support up to 1219 homes per year.
• ·      Wind turbines provide the cheapest renewable energy.
• ·      Wind turbines also do not need any special conditions and can be used everywhere in the world thus they are abundant.
• ·      Finally each wind turbine produces the same amount of energy as 16,000 solar panels hence they produce plenty of energy.
• ·      Wind farms are cheap to operate.

Disadvantages

• ·      Wind turbines rely on wind to generate power and wind does not always blow. Although wind turbines spin 70-80% of the time, this still means that they are potentially unpredictable and one cannot rely on power purely from wind turbines alone unless power is stored (Holttinen, 2006). However the current storage methods available are very expensive.
• ·      Although wind farms are cheap to operate, they are also very expensive to build so governments don’t always want to invest in them, especially when there are cheaper and easier fossil fuel alternative still available.
• ·      The location of wind farms is often derelict open spaces that are far away from city centers, where energy is required therefore long transmission lines are required to get electricity to its final destination. These are expensive and provide visual pollution.
• ·      The wind turbines themselves provide visual and noise pollution thus not all members of the public support them. For example there were major protests against the wind turbines that were installed in three mountainous passes in California- the Altamount Pass, east of San Francisco; the Tehachapi Pass, northeast of LA; and the San-Gor-gonio Pass near Palm Springs as people believed the wind turbines ruined the scenery of mountainous landscapes (Gipe, 1993).

Considering all the advantages and disadvantages of wind power, I think it is safe to say that it is all just a matter of time until wind power becomes more widely used. The main disadvantages are costs and ramblings of the public who are unwilling to accept new things in their familiar landscapes thus these disadvantages are only significant whilst the oil prices remain low making building of wind farms expensive and the public having no troubles affording their energy.