(A - E) (F - J) (K - O) (P - T) (U - Z)

  • Marginal Cost : The sum that has to be paid the next increment of product of service. The marginal cost of electricity is the price to be paid for kilowatt-hours above and beyond those supplied by presently available generating capacity.
  • Marginal Cost : The cost to the utility or providing the next (marginal) kilowatt-hour of electricity, irrespective of sunk costs.
  • Market Eligibility : The percentage of equipment still available for retrofit to the demand-side management measure. For example, if 20 percent of customers where demand controllers are feasible have already purchased demand controllers, then the eligible market eligibility factor is 80 percent.
  • Market-Based-Price : A price set by the mutual decisions of many buyers and sellers in a competitive market.
  • Marketer : An agent for generation projects who markets power on behalf of the generator. The marketer may also arrange transmission, firming or other ancillary services as needed. Though a marketer may perform many of the same functions as a broker, the difference is that a marketer represents the generator while a broker acts as a middleman.
  • Maximum Demand : Highest demand of the load within a specified period of time.
  • Maximum Demand : Highest demand of the load occurring within a specified period of time.
  • Measure Life : The length of time that the demand-side management technology will last before requiring replacement. The measure life equals the technology life. These terms are used synonymously.
  • Megawatt : One million watts.
  • Megawatt-hour (MWh) : One thousand kilowatt-hours or one million-watt hours.
  • Member System : An eligible customer operating as part of an agency composed exclusively of other eligible customers.
  • Meter Constant : This represents the ratio between instrument transformers (CTs, PTs) and the meter. It is used as a multiplier of the difference between meter readings to determine the kWh used. The meter constant is also used as a multiplier of the demand reading to determine the actual demand.
  • Mid-America Interconnected Network (MAIN : One of the ten regional reliability councils that make up the North American Electric Reliability Council (NERC).
  • Mid-Atlantic Area Council (MAAC) : One of the ten regional reliability councils that make up the North American Electric Reliability Council (NERC).
  • Mid-Continent Area Power Pool (MAPP); : One of the ten regional reliability councils that make up the North American Electric Reliability Council (NERC).
  • Mill : One mill is equal to one-thousandth of a dollar.
  • Mobile Substation : This is a movable substation which is used when a substation is not working or additional power is needed.
  • Monopoly : The only seller with control over market sales.
  • Monopsony : The only buyer with control over market purchases.
  • Municipal Electric Utility : A power utility system owned and operated by a local jurisdiction.
  • Municipal Solid Waste : A Biomass resource that can be used to produce energy by the process of incineration.
  • Municipalization : The process by which a municipal entity assumes responsibility for supplying utility service to its constituents. In supplying electricity, the municipality may generate and distribute the power or purchase wholesale power from other generators and distribute it.

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