By David Hughes
Abstract
Natural gas has increasingly been touted as a “bridge fuel” from high-carbon sources of energy like
coal and oil to a renewable energy future. This is based on renewed optimism on the ability of
horizontal drilling and hydraulic fracturing to access natural gas from previously inaccessible shale
gas deposits. A review of the latest outlook (2011) of the U.S. Energy Information Administration
(EIA) reveals that all eggs have been placed in the shale gas basket in terms of future growth in U.S.
gas production. Without shale gas, U.S. domestic gas production is projected to fall by 20% through
2035.
Shale gas is characterized by high-cost, rapidly depleting wells that require high energy and water
inputs. There is considerable controversy about the impacts of hydraulic fracturing on the
contamination of surface water and groundwater, as well as the disposal of toxic drilling fluids
produced from the wells. A moratorium has been placed on shale gas drilling in New York State.
Other analyses place the marginal cost of shale gas production well above current gas prices, and
above the EIA’s price assumptions for most of the next quarter century. An analysis of the EIA’s gas
production forecast reveals that record levels of drilling will be required to achieve it, along with
incumbent environmental impacts. Full-cycle greenhouse gas (GHG) emissions from shale gas may
also be worse than previously understood, and possibly worse than coal.
Even assuming the EIA forecast for growth in shale gas production can be achieved, there is little
scope for wholesale replacement of coal for electricity generation or oil for transportation in its
outlook. Replacing coal would require a 64% increase of lower-48 gas production over and above
2009 levels, heavy vehicles a further 24% and light vehicles yet another 76%. This would also
require a massive build out of new infrastructure, including pipelines, gas storage and refueling
facilities, and so forth. This is a logistical, geological, environmental, and financial pipe dream.
Although a shift to natural gas is not a silver bullet, there are many other avenues that can yield lower
GHG emissions and fuel requirements and thus improve energy security. More than half of the coalfired electricity generation fleet is more than 42 years old. Many of these plants are inefficient and
have few if any pollution controls. As much as 21% of coal-fired capacity will be retired under new
U.S. Environmental Protection Agency (EPA) regulations set to take effect in 2015. Best-in-class
technologies for both natural-gas- and coal-fired generation can reduce CO2 emissions by 17% and
24%, respectively, and reduce other pollutants. Capturing waste heat from these plants for district
and process heating can provide further increases in overall efficiency. The important role of natural
gas for uses other than electricity generation in the industrial, commercial, and residential sectors,
which constitute 70% of current natural gas consumption and for which there is no substitute at this
time, must also be kept in mind. Natural gas vehicles are likely to increase in a niche role for highmileage, short-haul applications.
Strategies for energy sustainability must focus on reducing energy demand and optimizing the use of
the fuels that must be burnt. At the end of the day, hydrocarbons that aren’t burnt produce no
emissions. Capital- and energy-intensive “solutions” such as carbon capture and storage (CSS) are
questionable at best and inconsistent with the whole notion of energy sustainability at worst.
AbstractNatural gas has increasingly been touted as a “bridge fuel” from high-carbon sources of energy like coal and oil to a renewable energy future. This is based on renewed optimism on the ability of horizontal drilling and hydraulic fracturing to access natural gas from previously inaccessible shale gas deposits. A review of the latest outlook (2011) of the U.S. Energy Information Administration (EIA) reveals that all eggs have been placed in the shale gas basket in terms of future growth in U.S. gas production. Without shale gas, U.S. domestic gas production is projected to fall by 20% through 2035. Shale gas is characterized by high-cost, rapidly depleting wells that require high energy and water inputs. There is considerable controversy about the impacts of hydraulic fracturing on the contamination of surface water and groundwater, as well as the disposal of toxic drilling fluids produced from the wells. A moratorium has been placed on shale gas drilling in New York State. Other analyses place the marginal cost of shale gas production well above current gas prices, and above the EIA’s price assumptions for most of the next quarter century. An analysis of the EIA’s gas production forecast reveals that record levels of drilling will be required to achieve it, along with incumbent environmental impacts. Full-cycle greenhouse gas (GHG) emissions from shale gas may also be worse than previously understood, and possibly worse than coal. Even assuming the EIA forecast for growth in shale gas production can be achieved, there is little scope for wholesale replacement of coal for electricity generation or oil for transportation in its outlook. Replacing coal would require a 64% increase of lower-48 gas production over and above 2009 levels, heavy vehicles a further 24% and light vehicles yet another 76%. This would also require a massive build out of new infrastructure, including pipelines, gas storage and refueling facilities, and so forth. This is a logistical, geological, environmental, and financial pipe dream. Although a shift to natural gas is not a silver bullet, there are many other avenues that can yield lower GHG emissions and fuel requirements and thus improve energy security. More than half of the coalfired electricity generation fleet is more than 42 years old. Many of these plants are inefficient and have few if any pollution controls. As much as 21% of coal-fired capacity will be retired under new U.S. Environmental Protection Agency (EPA) regulations set to take effect in 2015. Best-in-class technologies for both natural-gas- and coal-fired generation can reduce CO2 emissions by 17% and 24%, respectively, and reduce other pollutants. Capturing waste heat from these plants for district and process heating can provide further increases in overall efficiency. The important role of natural gas for uses other than electricity generation in the industrial, commercial, and residential sectors, which constitute 70% of current natural gas consumption and for which there is no substitute at this time, must also be kept in mind. Natural gas vehicles are likely to increase in a niche role for highmileage, short-haul applications. Strategies for energy sustainability must focus on reducing energy demand and optimizing the use of the fuels that must be burnt. At the end of the day, hydrocarbons that aren’t burnt produce no emissions. Capital- and energy-intensive “solutions” such as carbon capture and storage (CSS) are questionable at best and inconsistent with the whole notion of energy sustainability at worst.
Read full report at:
http://www.postcarbon.org/reports/PCI-report-nat-gas-future-plain.pdf
Monday, December 19, 2011 at 9:50AM 
