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  • Power System Balancing on 4 – 11 May 2020

    Consumption

    In the period from 4 to 11 May, the power system continued to retain a downward trend in the consumption of electricity. The average daily consumption in business days dropped to 341 million kWh (-3.4% as compared to the last week and -6.3% as compared to the same period last year).

    During the weekend of 9 to 11 May, the average consumption was 318 million kWh (-2.4% as compared to last week and -10.6% as compared to the same period last year).

    The irregularity of the load schedule (the difference between the night minimum consumption of 11–12 GW and the highest peak of consumption during evening hours of 15–16 GW) on weekdays was 4.5 GW and on weekends and holidays – 3.5 GW.

    RES Generation

    Daily electricity generation by solar and wind power plants (SPP and WPP) varied in a fairly large range: from 18 million kWh to almost 31 million kWh in one day. The peak of RES generation last week fell on 9 May – 30.8 million kWh (SPP – 23.3 million kWh, WPP – 7.5 million kWh).

    At the same time, to ensure the operational security of the IPS of Ukraine the dispatchers had to give limitation instructions to WPP and SPP on 10 May – the day when the consumption was at the lowest level in the week – 315 million kWh. The limitation lasted from 11:18 a.m. to 18:16; the total capacity reached 910 MW. In addition, on this day, to increase the consumption volumes in the power system CHPPs worked in the pump mode (pumping up) for almost 16 hours – from 01:00 a.m. to 17:00.

    Electricity Surplus

    There is still a large surplus of electricity which is mostly created by SE Guaranteed Buyer and NNEGC Energoatom. Last week the daily volume of electricity not sold to the end consumer on average reached about 68 million kWh. All of it was sold in the balancing market to the market participants (producers) who in accordance with the Market Rules submitted downward offers (i.e., agreed to resell to their buyers/consumers someone else’s electricity instead of generating own electricity).

    NPP Generation

    The average daily generation at NPPs dropped slightly compared to indicators of the last week (190.7 million kWh) and reached 186.6 million kWh. However, as of 11 May, starting from the beginning of the month the NPPs generated 2 billion kWh which was 16.8% higher than the volumes projected in the forecast balance. At the same time, the NPP share in the general generation structure starting from early May, as always, made more than half of the total volumes, in particular, about 56%.

    The NPP total load in the period from 4 to 7 May increased by 500 MW (to 8.02 thousand MW) due to the short-term increase of consumption in this period (from 335 million kWh to 347 million kWh). But already on 8 May, the total consumption as expected started to decline due approaching weekend and holidays. As a consequence, the NPP total load during the last three days dropped by 800 MW to 7,200 MW.

    HPP and TPP Generation

    A further reason for NPP load reduction starting from 8 May was the rain floodwater in the Dniester. As advised by PrJSC Ukrhydroenergo it started after the heavy rains in the middle of last week.

    These circumstances led to the need to increase generation at Dniester HPP. At the same time, the total volume of generation at hydro-electric power plants as compared to last week increased by 46% (from 9.6 million kWh to 14.4 million kWh) due to generation at Dniester HPP. From the beginning of the month, the total volume of electricity generation at HPPs reached 149.6 million kWh, which was 1.5% less than projected in the forecast balance.

    The total electricity generation at TPPs as of 11 May reached 890.4 million kWh, which was 17.6% less than the values in the forecast balance.

    Reserve Coverage

    The increase in HPP generation last week somewhat degraded the situation with the reserve deficit in the power system due to the increase of the baseload capacity at HPPs. In most days, the operation modes of the power system remain quite complicated.

    Nowadays, in the trade zone of the IPS of Ukraine, the demand for frequency restoration reserves (FRR) is met partially.   In particular,

    • the average daily coverage of the automatic frequency restoration reserve (aFRR) is about 20%. In night hours the reserves are not available at all
    • the demand for upward manual frequency restoration reserves (mFRR) is covered in the full scope and the hourly downward demand – from 41% to 61%.

    Frequency containment reserves (FCR) for the IPS of Ukraine are not procured because there are no offers from the market participants.

    Ancillary services for Burshtynska TPP Island are not procured due to the absence of its registered suppliers.

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