Glossary Terms G - L

Please note that each glossary term is followed by the source of the definition.

Generation Company (EEI)
The concept of a company that is solely engaged in the function of generating electricity.

Generator (EEI)
A machine which transforms mechanical energy into electric energy.

Grid (EEI)
An interconnected network of electric transmission lines, and related facilities.

Hourly Price Section (Ameren Illinois Tariff)
The part of the Illinois Auction through which Auction Products are procured for which charges to Retail Customers include a component that varies on an hourly basis.

Illinois Auction (Ameren Illinois Tariff)
A competitive process, conducted in accordance with the ICC's Order entered in the Docket Nos. 05-0160/05-0161/05-0162 (Cons.) and this Rider, through which the Company procures electric power and emery supply it requires for Customers choosing electric power and energy service from the Company. The Illinois Auction may include with other electric utilities that provide for the electric power and energy supply requirements of any such other electric utility's Retail Customers, in accordance with applicable orders issued by the ICC.

Illinois Auction Rules (Ameren Illinois Tariff)
The rules for the Illinois Auction established by the Auction Manager in compliance with this Rider and orders from the ICC.

Illinois Commerce Commission (ICC) or Commission (Ameren Illinois Tariff)
The Illinois Commerce Commission or any duly constituted successor to the Commission.

Independent System Operator (ISO) (EEI)
An independent, federally regulated control area operator with the primary responsibility of ensuring short-term reliability of the transmission grid. An ISO performs essentially the same function as a Regional Transmission Organization (RTO), but may not have the same requirements for regional configuration as an RTO.

Investor-owned Utility (EEI)
A privately-owned electric utility whose stock is publicly traded. It is rate regulated and authorized to achieve an allowed rate of return. Also known as a Shareholder-Owned Electric Utility or IOU.

Kilovar (kVAr) (EEI)
1,000 reactive voltamperes.

Kilowatt (kW) (Ameren Illinois Tariff)
A unit of measurement of the demand for electricity or rate at which electricity is used.

Kilowatt-hour (kWh) (Ameren Illinois Tariff)
A unit of measurement of the amount of electricity used.

kW-Day (Ameren Illinois Tariff)
The highest average load in kW during any fifteen minute interval during the calendar day for Customers in the Self-Generating Customer Group, and MW-Day/1000 for all other Customers.

Landlords and Property Managers
Landlords and property manages can use Ameren's Property Management site to help manage their units. The service provides managers with the ability to turn on/turn off service, receive notification of disconnection and much more.

Letter of Agency (LOA) (Ameren Illinois Tariff)
A document, as described in Section 2EE(2) of the Consumer Fraud and Deceptive Business Practices Act (815 ILCS 505/2EE(2)), provided by a Customer to the Retail Electric Supplier or Metering Services Provider to authorize that RES or MSP to change or provide certain services for such Customer.

Line Extension (Ameren Illinois Tariff)
Line Extension, for purposes of calculating Extension charges, is that portion of a single- or multi-phase Distribution System Extension on public right-of-way built to potentially serve additional Customers.

LMP (Locational Marginal Price) Market (Public Utilities Act)
An energy market operated by the MISO in which Energy is bought and sold at prices that vary with the points of delivery.

Load (EEI)
The term "load" is considered synonymous with "demand". "Load" may also be defined as an end-use device or an end-use customer that consumes power. Using this definition of "load," "demand" is the measure of power that a "load" receives or requires.

Load Forecast (EEI)
Predicted demand for electric power. A load forecast may be short-term (e.g., 15 minutes) for system operation purposes, long-term (i.e., 5 to 20 years ) for generation planning purposes, or for any range in between. Load forecasts may include peak demand (kW), energy (kWh), reactive power (kVAr) and/or load profile. Forecasts may be made of total system load, transmission load, substation/feeder load, individual customers' loads, and /or appliances.

Load Profile (EEI)
Shows the quantity of energy used by a class of customers or individual customer at specific time/intervals over a 24-hour period.

Local Distribution Utility (LDU) (EEI)
The utility that delivers electricity to a retail customer’s home or business along the distribution poles, wires and other necessary equipment, that the LDU either owns or operates (formerly a local electric utility).

Locational Marginal Price (LMP) (Ameren Illinois Tariff)
The price calculated and published by the MISO for a given point of delivery or collection of points of delivery.

Long-Term Firm Point-to-Point Transmission Service (Ameren RES Handbook)
Firm Point-to-Point Transmission Service under Part II of MISO's EMT with a term of one year or more.
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