Aggregator

a company intermediary or agent that combines the energy needs of multiple customers and then buys or provides the energy and services needed

British Thermal Unit (BTU)

a basic unit used to measure natural gas; the amount of natural gas needed to raise the temperature of one pound of water by one degree Fahrenheit

Competitive Supply Business

the portion of our business that provides energy and related value-added services to wholesale and retail customers in competitive markets

Dekatherm (DTH)

a standard measurement of natural gas; 10 therms or one million BTUs

Deregulation

in the industry the process by which regulated markets become competitive markets giving customers the opportunity to choose their energy supplier

Distribution

the delivery of energy to locations where customers use it - including homes businesses and industrial facilities

Estimated Proved Reserves

estimated quantities of crude oil natural gas and natural gas liquids that geological and engineering data show with reasonable certainty to be recoverable in future years from known reservoirs under existing economic and operating conditions

Federal Energy Regulatory Commission (FERC)

the U.S. agency that regulates interstate energy activities

Full Requirements Service

a product offering that handles all of a customer?s energy needs through a combined service that may include generating or buying energy managing load and power purchase agreements scheduling delivery managing risk settling accounts and other related activities

Generating Capacity

the amount of electricity that can be produced by a specifi c generating facility

Generation

the process of transforming other forms of energy - coal natural gas uranium oil wind water or sun - into electricity

Hedging

entering into transactions to manage various types of risk such as commodity price risk

Independent System Operator

an independent regulated entity established to manage a regional transmission system in a non-discriminatory manner and to help ensure the safety and reliability of the bulk power system

Load-Serving

the process of providing customers with the energy they need

Mark-to-Market

the valuation of a security commodity or fi nancial instrument to refl ect current market values

Maryland Public Service Commission

the agency responsible for regulating public utilities doing business in Maryland

Megawatt (MW)

one million watts of electricity enough electricity to light 10000 100-watt light bulbs for one hour

Nuclear Regulatory Commission (NRC)

the U.S. agency that regulates commercial nuclear power plants and the civilian use of nuclear materials

Origination

the initiation of wholesale energy purchases and sales that may include value-added services along with the energy

Peak Load

a measure of the maximum amount of electricity delivered at a point in time

Portfolio Management and Trading

using energy and energy-related commodities to manage our portfolio of purchases and sales to customers through structured transactions and trading energy and energyrelated commodities to deploy risk capital to earn additional returns

Regional Transmission Organization (RTO)

a group of companies with responsibility for the planning and use of power transmission lines in a geographic region

Regulated Business

the portion of our business whose primary operations and prices are set and controlled by the rules and activities of a state utility commission

Securities and Exchange Commission (SEC)

the U.S. agency charged with protecting investors maintaining fair orderly and effi cient markets and facilitating capital formation

Standard Offer Service

in Maryland the obligation of a utility - such as Baltimore Gas and Electric - to supply electricity to residential customers and to serve as the provider of last resort (POLR) for those customers who have not chosen an alternate supplier

Term

Definition

Tolling Contract

an agreement where a buyer pays a plant owner a fi xed amount per month to have the right to convert fuel provided by the buyer into electric energy

Transmission

the sending of electricity at high voltage usually on lines running along high towers from generating plants to substations where it is then reduced to a lower voltage that is delivered to homes businesses and industrial facilities

Unit Contingent Power Purchase Agreement

a contract with a power plant operator where the buyer receives the specifi ed output from the plant unless the plant is not operating

Value at Risk (VaR)

a statistical measure that helps evaluate risk by showing how much the value of our derivative assets and liabilities subject to mark-to-market accounting may change under various circumstances

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