• The backing down of wind and solar generation is done after giving instructions to all thermal generators for backing down upto technical limits.
  • The following are relavent regulatory clauses for backing down.
  • Compendium of CERC(DSM Regulations) clause 7.1 The over drawl/Under drawl by any buyer shall not exceed 250MWfor renewable rich state.
  • compendium of CERC(IEGC) Regulations clause 5.4.2(a) SLDC/SEB/Discom shall intiate action to restrict the drawl of its control area, from the Grid within the drawl schedule.
  • compendium of CERC(IEGC) Regulations clause 5.2.(m) all SEBs,SLDCs,RLDCs and NLDC shall take all possible measures to ensure that Grid frequency remains with in (49.90Hz-50.05Hz) the band.

Following are the instructions issued from SLDC for curtailment of wind generation with written justification

 
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DateBlock NoTimeSolar cutailment MWTotal Solar CurtailmentSolar generation MWReasons for Backing down
23-09-20193308:04:005050646 curtailed to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
23-09-20193308:06:00200200733 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
23-09-20193408:17:00100100834 curtailed to maintain grid security and safety as per IEGC REGULATION (Talaricheruvu SS)
23-09-20193408:19:005050768 curtailed to maintain grid security and safety as per IEGC REGULATION (Jammalamadugu SS (Mylavaram))
23-09-20193408:21:0050100739 curtailed to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
23-09-20193809:22:00200400767 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
23-09-20194811:46:00-200200619 released to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
23-09-20194811:59:00-500741 released to maintain grid security and safety as per IEGC REGULATION (Jammalamadugu SS (Mylavaram))
23-09-20194912:01:00-1000773 released to maintain grid security and safety as per IEGC REGULATION (Talaricheruvu SS)
23-09-20194912:11:00-100100840 released to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
23-09-20195012:30:001002001291 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
23-09-20195313:06:002004001312 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
23-09-20196014:55:00-200200705Released to maintain Grid security and safety as per IEGC regulation (Ghani SS).
23-09-20196115:12:00-5050700Released to maintain Grid security and safety as per IEGC regulation ( Distributed stations in percentage ).
23-09-20196516:00:00-2000570Released to maintain Grid security and safety as per IEGC regulation (Ghani SS).
23-09-20196616:20:00-500470Released to maintain Grid security and safety as per IEGC regulation ( Distributed stations in percentage ).
24-09-20193107:43:00100100388 curtailed to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
24-09-20193207:48:00100100449 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
24-09-20193207:54:00100100552 curtailed to maintain grid security and safety as per IEGC REGULATION (Talarichruvu)
24-09-20193207:55:003030567 curtailed to maintain grid security and safety as per IEGC REGULATION (Jammalamadugu (Mylavaram))
24-09-20193408:23:00100200450 curtailed to maintain grid security and safety as per IEGC REGULATION (Talarichruvu)
24-09-20193408:29:00100200517 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
24-09-20193508:34:00120150592 released to maintain grid security and safety as per IEGC REGULATION (Jammalamadugu (Mylavaram))
24-09-20193809:19:00-100100300 released to maintain grid security and safety as per IEGC REGULATION (Talarichruvu)
24-09-20193809:19:00-10050300 released to maintain grid security and safety as per IEGC REGULATION (Jammalamadugu (Mylavaram))
24-09-20193809:27:00-100100388 released to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
24-09-20194511:02:00-1000599 released to maintain grid security and safety as per IEGC REGULATION (Talarichruvu)
24-09-20194511:03:00-500610 released to maintain grid security and safety as per IEGC REGULATION (Jammalamadugu (Mylavaram))
24-09-20194711:32:00-6040886 released to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
24-09-20194711:43:00-400952 released to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
24-09-20195313:04:002002001363 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
24-09-20196215:23:00-50501062 released to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
24-09-20196315:46:00-500797 released to maintain grid s ecurity as per IEGC REGULATION ( Distributed stations in percentage )
24-09-20196415:54:00-2000758 released to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
25-09-20194009:58:001001001244 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
25-09-20194009:58:0050501244 curtailed to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
25-09-20194110:12:001002001248 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
25-09-20194210:19:001501501339 curtailed to maintain grid security and safety as per IEGC REGULATION (Talaricheruvu)
25-09-20194310:30:001001001242 curtailed to maintain grid security and safety as per IEGC REGULATION (Mylavaram)
25-09-20194310:30:00501001242 curtailed to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
25-09-20194511:03:001003001152 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
25-09-20194711:38:00-100200948 released to maintain grid security and safety as per IEGC regulation (Ghani SS)
25-09-20194711:44:00-1500909 released to maintain grid security and safety as per IEGC REGULATION (Talaricheruvu)
25-09-20194711:44:00-1000909 released to maintain grid security and safety as per IEGC REGULATION (Mylavaram)
25-09-20194711:44:00-5050909 released to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
25-09-20195112:35:00-1001001441 released to maintain grid security and safety as per IEGC regulation (Ghani SS)
25-09-20195112:35:00-5001441 released to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
25-09-20195313:04:001002001632 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
25-09-20195714:03:0050501509 curtailed to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
25-09-20196014:53:00-20001004 released to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
25-09-20196014:58:00-5001057 released to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
26-09-20193308:09:00100100543 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
26-09-20193308:10:005050545 curtailed to maintain grid security and safety as per IEGC REGULATION (Talaricheruvu SS)
26-09-20193308:10:002525545 curtailed to maintain grid security and safety as per IEGC REGULATION (Mylavaram SS)
26-09-20193408:20:005050577 curtailed to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
26-09-20193408:20:00100200577 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
26-09-20193909:43:00100300940 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
26-09-20193909:43:0050100940 curtailed to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
26-09-20194009:50:0050100824 curtailed to maintain grid security and safety as per IEGC REGULATION (Talaricheruvu SS)
26-09-20194009:50:00100125824 curtailed to maintain grid security and safety as per IEGC REGULATION (Mylavaram SS)
26-09-20194310:41:00100400760 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
26-09-20194912:08:00-100300746 released to maintain grid security and safety as per IEGC regulation (Ghani SS)
26-09-20195814:25:00-1250805 released to maintain grid security and safety as per IEGC REGULATION (Mylavaram SS)
26-09-20195914:36:00-1000726 released to maintain grid security and safety as per IEGC REGULATION (Talaricheruvu SS)
26-09-20195914:45:00-3000743 released to maintain grid security and safety as per IEGC regulation (Ghani SS)
26-09-20196415:49:00-1000663 released to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
27-09-20193508:31:0050501024 curtailed to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
27-09-20193809:25:00-5001145 released to maintain grid security and safety as per IEGC REGULATION ( Distributed stations in percentage )
27-09-20195613:48:003503501538 curtailed to maintain grid security and safety as per IEGC REGULATION (200MW at Ghani SS, 50 MW at Jammalamadugu & 100MW at Talaricheruvu )
27-09-20195714:05:002005501204 curtailed to maintain grid security and safety as per IEGC REGULATION (100MW at Ghani, 50MW & Jammalamadugu & 50MW at Talaricheruvu ) , Now total curtailment is ( 300MW at Ghani SS, 100 MW at Jammalamadugu & 150MW at Talaricheruvu)
27-09-20195814:18:00-2001001073 released to maintain grid security and safety as per IEGC regulation (Ghani SS)
27-09-20195914:35:00-3500879 released to maintain grid security and safety as per IEGC REGULATION (-100MW at Ghani SS, -100 MW at Jammalamadugu & -150MW at Talaricheruvu)
28-09-20195513:32:001501501764 curtailed to maintain grid security and safety as per IEGC REGULATION (Ghani SS)
28-09-20195714:01:001501501642 curtailed to maintain grid security and safety as per IEGC REGULATION (50MW at Jammalamadugu SS, 100MW at Talarcheru )
28-09-20195814:15:00-10001478 released to maintain grid security and safety as per IEGC REGULATION ( -100MW at Talarcheru ), Now total curtailment is (0MW at Talarcheru )
28-09-20195814:20:00-5001515 released to maintain grid security and safety as per IEGC REGULATION (-50MW at Jammalamadugu SS) , Now total curtailment is (0MW at Jammalamadugu SS)
28-09-20196014:43:00-15001509 released to maintain grid security and safety as per IEGC regulation (Ghani SS)
29-09-20193408:16:002002001017 curtailed to maintain grid security and safety as per IEGC REGULATION (100MW at Ghani SS, 50mw at Jammalamadugu SS, 50MW at Talarcheru)
29-09-20193408:29:002504501096 curtailed to maintain grid security and safety as per IEGC REGULATION (150MW at Ghani SS, 50mw at Jammalamadugu SS, 50MW at Talarcheru ) , Now total curtailment is (250MW at Ghani SS, 100mw at Jammalamadugu SS, 100MW at Talarcheru)
29-09-20193608:48:00-4500935 released to maintain grid security and safety as per IEGC REGULATION (-250MW at Ghani SS, -100mw at Jammalamadugu SS, -100MW at Talarcheru)
29-09-20194210:23:002502501743 curtailed to maintain grid security and safety as per IEGC REGULATION (100MW at Ghani SS, 50mw at Jammalamadugu SS, 100MW at Talarcheru)
29-09-20194310:40:001003501758 curtailed to maintain grid security and safety as per IEGC REGULATION (100MW at Ghani SS) , Now total curtailment is (200MW at Ghani SS, 50mw at Jammalamadugu SS, 100MW at Talarcheru)
29-09-20194511:07:00-1002501558 released to maintain grid security and safety as per IEGC REGULATION (-100MW at Talarcheru SS) , Now total curtailment is (200MW at Ghani SS, 50mw at Jammalamadugu SS, 0MW at Talarcheru)
29-09-20194811:48:00-1501001706 released to maintain grid security and safety as per IEGC REGULATION (-100MW at Ghani SS, -50MW at Jammalamadugu SS ) , Now total curtailment is( 100MW at Ghani SS )
29-09-20194811:58:00-10001768 released to maintain grid security and safety as per IEGC regulation (Ghani SS)
29-09-20195313:07:002002001815 curtailed to maintain grid security and safety as per IEGC regulation (Ghani SS)
29-09-20195413:23:00-20001688 released to maintain grid security and safety as per IEGC regulation (Ghani SS)