AGS: Stands for Alternative Gas Supplier. A non-utility who is approved by the Illinois
Commerce Commission to sell natural gas.
ARES: Stands for Alternative Retail Electric Supplier. A non-utility who is
approved by the Illinois Commerce Commission to sell electricity.
Ampere: The standard unit of electrical current. Often referred to as an amp.
Baseload: The minimum amount of power that a buyer needs to meet their demands.
Broker: An independent marketer who sells energy to commercial and/or residential
customers. Brokers are not part of a utility and often work with ARES and AGS suppliers.
Btu (British Thermal Unit): Standard unit of measurement often seen on
appliances that measures the heat of a fuel source.
Capacity: The maximum amount of power that a system or subsystem can carry or
produce at a specific moment. Capacity is typically measured in megawatts.
Capacity Charge: An additional charge that covers the difference between a customer's
peak energy use and their normal use during the same billing cycle.
Circuit: A conductor or a system of conductors through which electric current flows.
Contract Price: An agreed upon price between the seller and the buyer. The terms can be monthly, quarterly, yearly.
Day-Ahead Market: The market for energy for the following day.
Day-Ahead Schedule: Scheduling your energy needs 24 hrs in advance of your requirement,
allowing more flexibility to adjust energy needs.
Delivery: The physical of of delivering electricity or gas over the utility's system.
Demand: the rate at which electricity is delivered to or required over a
designated period, usually expressed in kilowatts or megawatts.
Deregulation: click here for more information.
Direct Access: The ability of a retail energy customer to purchase energy directly
on the wholesale market without going through the utility.
Distribution: Transporting energy to customers/end-users.
Energy Efficiency: The effective use of, management of, or creation of energy to minimize waste.
Federal Energy Regulatory Commission (FERC): United States Commission that
paved the way for de-regulation of the energy industry.
Firm Gas: Also referred to as uninterruptible, it is gas required to be
delivered and taken under the terms of an agreement.
Firm Power: Guaranteeing a pre-determined amount of energy is available at a specific timeframe.
Fixed Rate: A rate that will not change over the course of the agreement.
Forced Outage: A shutdown in energy delivery stemming from unanticipated breakdowns during generation or transmission.
Futures Market: Market for not-yet-produced commodities. These commodities are
bought and sold to mainly hedge against future price increases.
Generation: Producing energy.
Generator: A producer of energy.
Gigawatt: Unit of measure used for large power plants or grids, equals 1000 megawatts.
Hedging Contracts: Locking in at a predetermined cost for energy that is
independent from the market value at the time it is delivered. A hedging contract
allows you to lock-in to a rate that is equal to or slightly more than the
current market price for an extended period of time to protect against market increases.
ICAP: Installed Capacity: Generating capacity of a system.
Independent Power Producers: A producer that is not a public utility.
Index Rate: A rate plan that changes based on a specific market.
Kilowatt (kW): Unit of measure typically used to outline power consumption of a device.
Kilowatthour (kWh): Most commonly used unit to measure electricity usage.
Refers to usage of 1000 watts of power over the course of one hour.
Load (Electric): The power required of an energy generation system for a particular area at a specific time.
Market-Based Pricing: A price agreed upon by the buyer and seller based on current market conditions and the energy spot market.
Market Clearing Price: The highest price that can be expected given that all demand is met and supply is sold.
Maximum Demand: The highest average value of power taken from averages of successive time periods.
Megawatt (MW): Equals one million watts, typically reserved for a large commercial building or application.
Megawatthour (MWh): Term used for metering larger commercial customers.
Non-Firm Power: Purchase of available energy that is not required by customers who arranged for its production.
Off-Peak Gas: Gas obtained when it is not at its peak demand.
Open Access: When a utility’s transmission lines are available for use to receive energy from another supplier.
Outage: Interruption in service that prevents power from being delivered.
Peak Demand: Maximum amount of power required to service customers that are on a particular system.
Peaking Capacity: Generating capacity to meet peak supply needs.
Power Exchange: "Stock Exchange" for energy producers to buy and sell energy.
Reliability: The ability of your provider to have sufficient supply and quality transmission.
Renewable Resources: Energy sourced that is restored by the environment or natural processes with assistance by people.
Reserve Margin: Available power beyond what is needed to meet normal peak demand.
Retail Wheeling: Ability for a consumer to purchase or a supplier to transmit energy over another utility’s line.
Scheduled Outage: Interruption in service that has been pre-planned, typically for maintenance to a transmission system.
Spinning Reserve: Back-up capacity that can be available in ten minutes and operate for two hours.
Spot Purchases: Fast and fair transactions among energy producers and consumers for power
required in the near future over short periods of time.
Transmission: Transportation of energy across a grid or power lines.
Usage: Amount of energy consumed typically measured in KWh.
Variable Rate: A cost that changes based on variables: energy generation, transportation, delivery, maintenance, etc.