A-C | D-E | F-I | L-N| O-Q | R | S-Z | Acronyms
lead participant - The primary representative and bidder for a resource.
line loss - The power lost (turned to heat) during the transmission or distribution of electricity.
LMP Calculator - The software tool used to calculate locational marginal prices.
load - Demand; the amount of electrical power used; the level of electricity consumption at a particular time measured in megawatts.
load factor - The ratio of the average hourly use of electric energy (average load in kilowatts) to the maximum hourly use of electric energy (peak load), expressed as a percentage.
load management - The use of installed measures, systems, or strategies by end-use customers to curtail their electrical usage during peak hours or shift electrical use to off-peak hours to reduce the amount of capacity needed to deliver an acceptable level of service to those facilities..
load response - A reduction of load by demand-side resources
load obligation - The sum of metered load, exports, and load-shifting contracts for which a lead participant is financially responsible.
load pockets - Areas of the system where the transmission capability is not adequate to import capacity from other parts of the system and demand is met by relying on local generation.
load-serving entity (LSE) - An entity that secures electric energy, transmission service, and related services to serve the demand of its customers.
load shedding - Controlled or scheduled power outages (controlled blackouts) to balance the demand for electricity with limited supply.
load zone - An aggregation of nodes within a specific area. There are currently 8 load zones in New England, and they have the same boundaries as the New England reliability regions.
local sourcing requirement - The portion of the total capacity requirement of the load in an FCM capacity zone that must be purchased from resources within that zone after accounting for the capacity that can reliably be imported into that zone.
location - A node, external node, load zone, or hub.
Locational Forward Reserve Market - see Forward Reserve Market.
locational marginal price (LMP) - The calculated price of electric energy at a node, load zone, reliability region, and the hub.
loss-of-load evaluation (LOLE) - An analysis that determines the amount of installed capacity the system needs to meet the NPCC and ISO resource adequacy planning criterion to not disconnect firm load more frequently than one day in 10 years.
marginal - Just barely covering costs.
marginal loss component - The component of the nodal price that reflects the marginal loss at a node.
marginal resource - The price-setting generator; the last unit committed to meet load in economic dispatch.
market participant - An entity that conducts business in one or more electricity market. Specifically, an entity in New England that has executed a Market Participant Service Agreement or on whose behalf an unexecuted Market Participant Service Agreement has been filed with the Federal Energy Regulatory Commission (FERC).
merit order - The order that ISO New England designates generators to operate based on the lowest to highest cleared offers, until the demand for electric energy is met.
mileage payment - A payment to a generator providing regulation service according to how much the generators output fluctuates (in megawatts) in response to a regulation signal sent by the ISO.
minimum generation emergency - An emergency declared by the ISO in which the ISO anticipates requesting one or more generating resources to operate at or below its economic minimum limit so that it can manage, alleviate, or end the emergency.
N-1 - A first contingency; the largest impact on the system when a first power element (generation or transmission facility) of a system is lost.
N-1-1, N-2 - A second contingency; the loss of the facility that would have the largest impact on the system after the first facility is lost.
nameplate capacity, nameplate - The rating of a generator and a measure of its ability to produce electricity.
Net Commitment-Period Compensation (NCPC) - The payment to an eligible resource that did not fully recover its costs from the either the Day-Ahead or Real-Time Energy Market. The accounting for the provision of these credits is performed daily for each market and considers a resource's total offer amount for generation, including start-up fees and no-load fees, compared with its total energy-market value during the day. If the total value is less than the offer amount, the difference is credited to the market participant.
net energy for load - The net generation output within a control area, accounting for energy imports from other areas and subtracting energy exports to others. It includes system losses but excludes the energy required to operate pumped storage plants.
network model - The computer-based representation of physical transmission system assets used by ISO New England.
New England Power Pool (NEPOOL) - A group formed in 1971 by the region's private and municipal utilities to foster cooperation and coordination among the utilities in the six-state region for ensuring a dependable supply of electricity. Today, NEPOOL members are ISO stakeholders and market participants.
nodal price - The price for electric energy received or furnished at a node for any given hour.
node (or nodal) - A point on the transmission system for which nodal prices are calculated.
no-load cost or fee- The amount, in dollars per hour, that must be paid to a generating unit scheduled to operate in the New England market. A payment in addition to the start-up fee and price offered to supply electric energy for each hour.
noncoincident peak load - The sum of contributor peak loads (MW) that occurred on different days and hours.
nonfirm gas - Gas delivered under a contract that includes transportation service subject to interruption to avoid interfering with or restricting gas deliveries having a higher priority.
no-notice service - When gas pipeline companies provide gas on short notice.
nonspinning - Off-line generation not synchronized to the system.
nonspinning reserve, nonsynchronized reserve - Off-line generation that can quickly be electrically synchronized to the system and increase output to respond to a contingency and serve demand.
NX-12 and/or NX-12E - Forms submitted to ISO New England that identify technical data associated with assets.