UI rate @50Hz= 155ps/uMedian of of Average cost of Coal/

Lignite for 08/09-01/10 UI rate @49.7Hz= 403ps/u

sufficient incentive to the generating station based on coal including imported coal

UI rate @49.5Hz= 873 ps/uhighest of the average energy charges

of generating stations for 08/09-01/10

Generators under APM fuel: If the UI rate in a time block exceeds 403 ps/u

then the UI rate for the station is restricted to = 403ps/u

Restricted cap rates For over-generation in a time block beyond

105% of the Declared Capacity i.e. if the generation is 105% to 107% (say) then for the extra 2% beyond 105% the rate = 155ps/u

For over-generation when the generation exceeds 101% of the Declared Capacity over an entire day then for any time block in that day,when the generation is say 104% then for the extra 3% (104%-101%) the rate is = 155ps/u

Beneficiary or Buyer : For Underdrawal upto10% or 250MW

whichever is less = No cap For Underdrawal beyond 10% or 250MW shall

not exceed 403ps/u For Eg:- if AP has schedule of 100 MW,but is

underdrawing at 91MW then for the 9MW the prevailing rate applies.But if it is underdrawing at 88MW and if the rate is 873ps/u (i.e. more than 403ps/u) then for 2MW (i.e. 100-10% of 100=90;90-88=2) the rate will be restricted to 403ps/u

For Sellers For Overgeneration upto 120% of

Schedule = No cap For Overgeneration beyond 120% of

Schedule but upto 100% of Installed capacity =403ps/u

Restricted Cap Rates For Overgeneration beyond 105% of IC in

a block or 101% of IC in a day = 155ps/u

Additional UI is independent of individual behaviour of any constituents/ISGS/Seller

It is dependent solely on frequency. Two frequency slabs1. 49.5 Hz < SR/ER frequency < 49.2 Hz2. SR/ER frequency < 49.2 Hz

For Beneficiary/Seller If Overdrawing then

40 % of rate at 49.5 Hz i.e. 40% of 873ps/u If Underinjecting then

20% of rate at 49.5 Hz i.e. 20% of 873ps/u For ISGS

Only for underinjecting20% of rate at 49.7 Hz i.e. 20% of 403ps/u

For Beneficiary/Seller If Overdrawing then

100 % of rate at 49.5 Hz i.e. 873ps/u If Underinjecting then

40% of rate at 49.5 Hz i.e. 40% of 873ps/u For ISGS

Only for underinjecting40% of rate at 49.7 Hz i.e. 40% of 403ps/u

UI = Schedule – Actual Taken from .tn1/kp1/… & .re1 files Nuclear UI Adjustment to be taken into

picture.

Case study: Suppose KAPS has a Schedule of 100MW.As per

schedule its allocation has been split equally between KA,KL,TN,AP.

Now,let its Actual be 104MW. So, KA gets 26MW=KL=TN=AP. Each state gets an extra of 1MW. If there was no nuclear UI,then let UI of each state

be 100,200,300,400 MW respectively Now, when there is nuclear UI,then the UI of each

state is adjusted by 1MW. Resultant UI becomes 99,199,299,399MW.

After the nuclear adjustment is done (for all 4 nuclear PPs) this resultant/effective/total UI is from now on taken as the normal UI.

So amount for the UI = 2.5 * UI (in MW) * rate (in ps/KWh)

Calculation of quantity of UI to be restricted = X (say…)

Restricted amount = 2.5*restricted rate * X

Restricted rate = 155ps/u iff prevailing rates more than 155ps/u

Valid only for ISGS & Seller

For ISGS/Seller –> Quantity of UI to be capped = UI – X

Capped amount = 2.5*(UI - X)*capped rate(403ps/u)

For beneficiary,Capped amount = 2.5*quantity*capped rate(403ps/u)

Quantity = beyond 10% of Schedule or 250MW,whichever is less.

For seller Rate = 403ps/u when UI > 120% of

schedule but when UI < 105% of IC. Capped amount = 2.5*UI*rate. Quantity = UI

Applicable only when frequency is lower than ideal frequency band.

Amount = 2.5*rate*UI Rate is dependent on frequency, type of

constituents and overdrawal/underinjection.

Differential amount arised from capping (due to U/D & O/I) = UI amount w/o capping – UI amount with capping

Differential amount arised from capping = UI amount w/o capping – (restricted amount + APM capping)

Valid only for generators & Sellers

When payable > receivable then payable is made equal to receivable by curtailing the payable of states only,so that total payable = total receivable.

Say, when receivable = 100 crores, payable = 110 crores.

However, in the payable column, among states say if KA only has to pay 8 crores.

When restricting,the states amount has to be curtailed by 10 crores so that payable = receivable.

In this case if it is curtailed,then KA receives 2 crores instead of paying 8 crores.

Hence, to avoid this, KA payable is made = 0,the extra 2 Crores go to SR UI Pool.