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pay for the costs of installing necessary metering equipment. (Net metering and dual
metering are not available to systems greater than 2 MW.)
For systems up to 40 kW in capacity, any net excess generation (NEG) during a billing
period is carried over as a kilowatt-hour (kWh) credit to the following billing period. At the
end of an annualized period, any remaining NEG credits in the customer's account
expire. Customers may select an annualized period that ends with last day of either their
April or October billing period for this purpose. All net-metering customers (and dualmetering
customers) hold ownership and title to all renewable-energy credits (RECs)
and greenhouse-gas credits associated with customer generation.
For customers taking service under a time-of-use (TOU) tariff, any monthly consumption
of electricity is calculated according to the terms of the contract or tariff to which the
same customer would be assigned to or be eligible for if the customer was not a netmetering
customer. When net-metering customers under TOU tariffs are net generators
during any discrete TOU period, the net kWh produced are valued at the same price per
kWh as the utility would charge for retail kWh sales during that same time of use period.
Credits for NEG may be used to offset other charges assessed by the electricity
provider.
Each utility must provide net metering and dual metering until the load of its net-metering
customers and dual-metering customers equals 1% of the total peak demand supplied
by the utility during the previous year. The number of new eligible customers with
generators that have a nameplate rating of 40 kW or less is limited to 200 total new
billing accounts for Ameren Companies, ComEd and MidAmerican for the period of April
1, 2008, through March 31, 2009. Utilities are directed to establish an open enrollment
period during the first month that net metering is offered. If applications during the open
enrollment period exceed the limits described above, enrollment priority will be
determined by lottery. Utilities may initially give preference to customers already enrolled
in net billing or similar programs at their discretion. Subsequent applications will be
addressed on a first-come, first-served basis.
* Illinois allows dual metering for systems greater than 40 kW but not greater than two
megawatts (MW), although the customer must pay for the metering equipment, and
nonresidential customers must pay for "all taxes, fees and utility delivery charges" for the
gross amount of electricity delivered by the utility. As an economic incentive, dual
metering is generally less favorable to customers than net metering.
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