Wheeling (electric power transmission) | Wikipedia audio article

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In electric power transmission, wheeling is
the transportation of electric energy (megawatt-hours) from within an electrical grid to an electrical
load outside the grid boundaries. Two types of wheeling are 1) a wheel-through,
where the electrical power generation and the load are both outside the boundaries of
the transmission system and 2) a wheel-out, where the generation resource is inside the
boundaries of the transmission system but the load is outside. Wheeling often refers to the scheduling of
the energy transfer from one Balancing Authority to another. Since the wheeling of electric energy requires
use of a transmission system, there is often an associated fee which goes to the transmission
owners. In a simpler sense, it refers to the process
of transmission of electricity through the transmission lines.==Transmission ownership==
Under deregulation, many vertically integrated utilities were separated into generation owners,
transmission and distribution owners, and retail providers. In order to recover capital costs, operating
costs, and earn a return on investment, a transmission revenue requirement (TRR) is
established and approved by a national agency (such as the Federal Energy Regulatory Commission
in the United States) for each transmission owner. The TRR is paid through transmission access
charges (TACs), load-weighted fees charged to internal load and energy exports for use
of the transmission facilities. The energy export fee is often referred to
as a wheeling charge. When wheeling-through, the transmission access
charge only applies to the exported amount.==Wheeling charge==
A wheeling charge is a currency per megawatt-hour amount that a transmission owner receives
for the use of its system to export energy. The total amount due in TAC fees is determined
by the equation Total wheeling fee=Wc ($/MWh) * Pw (MW)
* t (h) The fee associated with wheeling is referred
to as a “wheeling charge.” This is an amount in $/MWh which transmission
owner recovers for the use of its system. If the resource entity must go through multiple
[transmission owner]s, it may be charged a wheeling charge for each one. The reasons for a wheeling charge are manifold. It may be simply to recover some costs of
transmission facilities or congestion. However, another motivation would be to keep
prices low. For instance, if the electricity prices in
Arizona are 30 $/MWh and prices in California are 50 $/MWh, resources in Arizona would want
to sell to the California market to make more money. The utilities in Arizona would then be forced
to pay 50 $/MWh if they needed these resources. If Arizona charged a wheeling charge of 10
$/MWh, Arizona would only have to pay 40 $ /MWh to compete with California. However, Arizona would not want to charge
too much, as this could impact advantages of trading electric energy between systems. In this way, it works similarly to [tariff]s.==See also==
Power outage V2G

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