While wind energy is a widely supported and a rapidly growing renewable energy source, it is well known that most land-based wind blows at night. The problem is peak energy usage is during the day, and peak prices are paid for electricity during the day. The diurnal movement of power from night to day, thus, presents a huge future opportunity for the wind and renewable energy industry. Mass storage in the many megawatt (MW) level is a critical next step in the renewable energy industry. A recent transaction may bode well for this nascent industry.
FirstEnergy Generation Corp., a subsidiary of Akron, Ohio-based FirstEnergy Corp. ( purchased the rights to develop a
compressed-air electric generating plant on a 92-acre site in Norton,
Ohio, from CAES Development Company, LLC. The transaction includes
rights to a 600-acre underground cavern, formerly operated as a
limestone mine, to be used for energy storage.
"The
compressed-air technology envisioned at this site would essentially
operate like a large battery, storing energy at night for use during
the day when it is needed," said Anthony J. Alexander, president and
chief executive officer of FirstEnergy. "Because many renewable energy
sources - such as wind - are intermittent, they don't always produce
power when electricity demand is high. The energy storage aspects of
this project would provide a way to harness renewable energy to be used
when customers need it, making this project a key component to our
region's overall renewable energy strategy."
"This
project has the potential to create hundreds of construction jobs and
provide support for the development of a vibrant renewable energy
business - and additional 'green energy' jobs - in Ohio," said Ohio
Governor Ted Strickland. "This is an example of how we can leverage
technology and our natural resources to grow our economy and ensure our
energy future."
Similar
to pumped-hydro storage - where water is pumped up to a reservoir then
released through a turbine to produce electricity during peak periods -
compressed-air technology involves compressing air in an underground
cavern or other chamber during the evening - when electricity demand is
lower - and releasing it during the day, when the need for electricity
is greater.
"A
compressed-air energy storage project of this size has the potential to
be a major step in advancing electricity storage and balancing load
demand," said Arshad Mansoor, vice president of Power Delivery and
Utilization at the Electric Power Research Institute. "This could be a
key component in integrating large-scale intermittent renewables onto
the nation's grid system."
The
company is evaluating its options related to the project, but has not
yet committed to development scope or timing. However, an initial phase
could involve installing two to four units capable of generating a
minimum of 268 megawatts (MW) of electricity. With 9.6 million cubic
meters of storage, the Norton Energy Storage Project has the potential
to be expanded to up to 2,700 MW of capacity.
Currently,
there are two commercial-scale compressed air electric generating
facilities: a 110 MW plant in McIntosh, Ala., operated by PowerSouth
Cooperative that began service in 1991; and a 290 MW facility in
Bremen, Germany, that has been in operation since 1978. While there are
other compressed-air projects under development, none is expected to be
comparable in size and scope to the Norton facility.
Compressed-air
storage, when combined with renewable energy resources, provides for
low-emitting power generation that is dispatched when customers need
it. FirstEnergy currently has more than 800 MW of renewable capacity,
including pumped-storage hydro and wind power. By the end of 2012, when
the biomass project at the Burger Plant is complete, the company's
renewable capacity could be more than 1,000 MW.
Other energy storage technologies under development include heat storage in molten salt and heat storage in rock, fly wheels, water storage behind dams or water towers, and large "batteries". The Department of Energy is investing in research in some of these areas, but more incentives, private investment, and research are needed to further develop storage technology.
Recent Comments