Shale Natural Gas vs. Renewable Energy — Guest Blogger Anil

Whether it is head scratching politicians in Copenhagen or industry analysts predicting that peak oil has already happened in one of the past decades, the pointers aim towards a fundamental shift – the process of doing away with carbon-based fuels and looking for renewable sources of energy. The changes are partly triggered by environment concerns and largely by fear of all industrial progress achieved so far coming to a grinding halt.

Needless to say, renewables aren’t trouble-free. Two of the major renewable sources, wind and solar both cost more than gas or coal. Prices are coming down with advances in technology, but intermittent nature of the energy production from renewable sources adds another dimension to the problem and puts the total cost of generating one unit of energy way compared with the fossil fuels. Wind speed becomes optimum for operating turbines at the height of around 800 meters, but creating a tower that high isn’t feasible. Furthermore, current wind turbine installations require around ten times concrete and steel that is required for generating the same amount of nuclear power.

Similarly, solar energy isn’t always available and the solar energy to electricity conversion ratio is just around 25 percent in most efficient crystalline silicon technology. Thus, instead of just focusing on renewables, options including a blend of fossil fuels with renewable sources or less polluting fossil fuels are being considered.

And good-old fossils aren’t letting us down. Although considered most benign of the pack, natural gas only emits around half as much as coal. On a grid level, probably it makes more sense to promote natural gas instead of counting on renewable as instruments to knock coal. Natural gas turbines can accommodate round the clock electricity generation unlike renewable thus helping in bridging the supply and demand gaps.
Last year witnessed a rare confluence of triggers resulting in a year with one of the lowest economic activity since Second World War. Quite predictably (in the hindsight), manufacturers ran high inventory levels with significantly less demand. As it turned out, Solar panel prices nosedived and so did the prices of natural gas. Natural gas prices are still depressed with futures currently trading at around 60 percent below last year’s high in US.

However, looks like the sector is in for a makeover. Apparently, ExxonMobil is betting big on natural gas. The oil giant has made a US$31 billion bid to acquire US natural gas player XTO Energy in an all stock deal. In addition, the company will assume debts amounting to US$10 billion. XTO Energy is an unconventional natural gas play. XTO has rights to large reserves of natural gas in shale, coal bed methane and tightly compressed sands. Shale gas is natural gas contained in shales, a type of sedimentary rock with low porosities and permeability.
But the extraction of gas is both difficult and costly. The extraction process includes drilling of several thousand feet and horizontally drilling through the shale. The process also involves large quantities of water up to 2 -4 million gallon along with sand and chemicals to break open the rock and release the gas.

However, technological advancements such as formation fracturing and horizontal drilling have made it possible to extract gas in an economic manner. The market’s first brush with new technology came in 2004 when natural gas giant Range Resources drilled the first modern well in the Marcellus Shale, spread across Pennsylvania, Ohio and West Virginia.

More on this soon.