Xcel Energy 2009 Annual Report Download - page 16

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PJM Pennsylvania-New Jersey-Maryland Interconnection
PSP Performance share plan
PURPA Public Utility Regulatory Policies Act of 1978
rate base The investor-owned plant facilities for generation, transmission and distribution and other assets
used in supplying utility service to the consumer.
REC Renewable energy credit
RECB Regional Expansion Criteria Benefits
RFP Request for Proposal
ROE Return on equity
RPS Renewable Portfolio Standard, is a regulation that requires the increased production of energy
from renewable energy sources, such as wind, solar, biomass, and geothermal.
RTO Regional Transmission Organization. An independent entity, which is established to have
‘‘functional control’’ over a utility’s electric transmission systems, in order to provide
non-discriminatory access to transmission of electricity.
SO2Sulfur dioxide
SPP Southwest Power Pool, Inc.
Standard & Poor’s Standard & Poor’s Ratings Services
TSR Total shareholder return
unbilled revenues Amount of service rendered but not billed at the end of an accounting period. Cycle meter-
reading practices result in unbilled consumption between the date of last meter reading and the
end of the period.
underlying A specified interest rate, security price, commodity price, foreign exchange rate, index of prices
or rates, or other variable, including the occurrence or nonoccurrence of a specified event such
as a scheduled payment under a contract.
wheeling or transmission An electric service wherein high-voltage transmission facilities of one utility system are used to
transmit power generated within or purchased from another system.
working capital Funds necessary to meet operating expenses.
Measurements
Bcf Billion cubic feet
Btu British thermal unit. A standard unit for measuring thermal energy or heat commonly used as a
gauge for the energy content of natural gas and other fuels.
GWh Gigawatt hours. One gigawatt hour equals one billion watt hours.
KV Kilovolts (one KV equals one thousand volts)
KW Kilowatts (one KW equals one thousand watts)
Kwh Kilowatt hours
Mcf Thousand cubic feet
MMBtu One million Btus
MW Megawatts (one MW equals one thousand KW)
Volt The unit of measurement of electromotive force. Equivalent to the force required to produce a
current of one ampere through a resistance of one ohm. The unit of measure for electrical
potential. Generally measured in kilovolts.
Watt A measure of power production or usage.
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