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  • On operation of the power system on 25-31 May, 2020


    New stages of easing the quarantine restrictions in most regions of Ukraine; Kyiv, Kharkiv, and Dnipro underground railways resumed their work that resulted in some power consumption improvements. Last week, 25-31 May, the average daily consumption on working days increased by 2.1% up to 355.8 million kWhcompared to the previous week. However, this is by 3.3% less than for the same period of the previous year(368 million kWh). At the weekend, 30-31 May, the average consumption was by 1.8% higher than at the weekend of the previous week – 334 million kWh.

    In total, in May 2020, the consumption (according to operational data) amounted to 10.6 billion kWh, that is by5.8% less in May 2019. The average power consumption in May amounted to 341.4 million kWh.

    Irregularity of the load schedule (difference between the night off-peak 11.9 – 12 GW and the evening peak hours 16 – 16.7 GW) on working days amounted to 4-4.5 GW, on days-off – 4 GW. It is worth noting the increase in morning peak hours (09:00 – 11:00) from 14 to 16 GW (on Tuesday 26 May) compared to the quarantine restrictions period.

    RES generation

    Daily solar (SPP) and wind (WPP) power generation oscillated in significant range as before: from 16.9 million to 31.4  million kWh per day. The peak RES generation on previous week amounted to 31.4 million kWh on 30May. This week, on 30 May, WPP generation experienced its maximum for the month – 17.8 million kWh. In addition, on 30-31 May, WPP production exceeded SPP production by 8.4 million kWh. Total RES production amounted to 161.2 million kWh.

    There were no dispatch restrictions on WPP and SPP generations.

    According to May results, WPPs have exceeded power generation by 11.2% (222.5 million kWh compared to the planned 200 million kWh), and SPPs have underproduced 16.4% (618.7 million kWh compared to the planned 740 million kWh).

    On power surplus

    During the last week, daily volumes of undistributed electricity to end-users amounted at average to 30million kWh. These volumes were sold in balancing market to those participants (producers), which applied for unloading according to market rules (in other words, agreed to resell somebody’s else electricity to their buyers/consumers instead of generating their own).

    NPP generation

    Daily average NPP generation has decreased compared to the previous week from 175 million kWh to 164 million kWh. Total NPP loading from 25 to 26 May  remained at the same level compared to the previous week, that is 7.3 GW, and from 27 to 31 May, it has reduced up to 6.6-6.7 GW. NPP capacity reduction in the total power balance was implemented according to NNEGC Energoatom’s application approved by NPC Ukrenergo to implement the measures of the Government Anti-Crisis Plan.

    At the same time, in May, NPPs produced 5.5 billion kWh, that is by 11.2% more than the volumes stipulated in the forecast balance. In May, NPP share in total production structure amounted to half of the total volume, namely 50%.

    As of 31 May, as last week, 10 NPP power units were in operation mode, 4 more power units were shut down for repairing, and 1 unit was switched to standby mode.

    HPP and TPP generation

    The average HPP daily production on 25-31 May compared to the previous week has increased by 5% (from13.2 million kWh to 13.9 million kWh). In May, HPPs produced 425.3 million kWh, that is by 0.6% less than the value stipulated in the May forecast balance. In addition, PSPPs produced 134 million kWh (-2.2% compared to the forecast), and consumed 182.1 million kWh in the pump mode, that is by 4.2% less compared to the forecast value.

    Last week, TPP generation increased by 21.1% (from 735.6 million kWh to 890.9 million kWh). Total TPP power production in May amounted to 3.1 billion kWh, that is by 2% less than the value stipulated in the forecast balance. TPP share in total production structure amounts to approximately 29%.

    Ensuring reserves

    The operation modes of the power system remain mostly complicated. In the IPS trading zone, ensuring automatic frequency restoration reserve (аFRR) during the week amounted to 20% of the need (the need ±372 МW). In particular, in the nighttime zone, reserves are absent, and in the daytime zone (from 8:00 to 23:00) the average purchased amounts from ±97 МW to ±170 МW. At weekend (30-31 May), the average aFRR ensuring amounted to approximately 45%, reserves were purchased for all the hours in the amount from 100 to 217 МW.

    The need for manual frequency restoration reserve (mFRR) was fully ensured for loading (628 МW), and the hourly need for unloading during the week by 70% (30 МW – 49 МW of the needed 49 МW). In days-off, the need for mFRR was completely ensured both for loading and unloading.

    The purchasing of frequency containment reserve (FCR) has commenced (the only market participant proposing it – Kharkivska CHP-5). The need for FCR was ensured only by 10% on 25 and 26 May. On other days, FCR was not being purchased due to the absence of offers in the ancillary services market.

    Ancillary services for “Burshtyn island” are still not purchased due to the absence of registered suppliers.

    On 27 May, Zaporizka TPP of PJSC DTEK Dniproenergo received a certificate of compliance of its electrical installations with requirements for ancillary services and was put on the Register of ancillary services providers.

    The certificates confirm the ability of Zaporizka TPP to provide the following ancillary services:

    • secondary regulation: manual frequency restoration reserve (mFRR) of 183 MW for loading and 132 MW for unloading;
    • tertiary regulation: replacement reserve (RR) of 363 MW both for loading and unloading.

    It is worth noting that total volume of certified FRR in the power system amounts to ±115 МW, aFRR – 1449 МW (±724.5 МW), mFRR – 3666 МВW (-3615), and RR – 4263 МW.

    Power production on 18-24 May and 24-31 May

    On 25-31 May, power consumption amounted to 2.447 billion kWh. On 18-24 May, NPP share in the balance amounted to 49%, and TPP – 30%. Next week, on 25-31 May, after NNEGC Energoatom applied for loading reduction up to 6.650 МW, NPP share in the total balance has reduced to 46%, and TPP share has increased up to 36%. On 18-24 May, NPP share compared to power consumption amounted to 50.7%, and on  25-31 May — 46.9%.

    Power production in May 2020

    Power consumption in May 2020 according to operational data amounts to 10.584 billion kWh, that is by 5.8% more compared to the forecast balance. However, this value is by 6.17% less compared to the same value of May 2019 року (11.28 billion kWh).

    In May 2020, NPP share reduced by 6%, and TPP share increased by 1% compared to May 2019.

    NPP production share relative to consumption in May 2020 amounted to 51.7%, and in May 2019 — 57.9%.



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