## 2 Literature Review on Current Tendency on Renewable and Coal Energy
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Energy (GWh)** & **2019** & **2020** & **2021** & **I-VI 2021** & **I-VI 2022** \\ \hline Production & 158,767 & 152,308 & 173,583 & 83,092 & 89,117 \\ Consumption & 169,391 & 165,532 & 174,402 & 86,365 & 87,409 \\ Balance (Export in +, Import \(-\)) & \(-\)10,624 & \(-\)13,224 & \(-\)819 & \(-\)3273 & 1708 \\ from RES & 14,344 & 16,372 & 18,984 & 10,749 & 16,652 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Total electricity production and consumption by source in Poland (in GWh). Poland, refs. [24; 25; 26] studied green scenarios for Poland and [27; 28; 29] discussed the energy transformation in Poland. On the other hand, several articles on renewable energy have also been written this year (2022). There are papers on climate policy uncertainty and world renewable energy index volatility forecasting [30], ultra-short-term spatiotemporal forecasting of renewable resources: an attention temporal convolutional network-based approach [31], weather forecasting for renewable energy system [32] and modelling the evolution of wind and solar power infeed forecasts [33]. In reference to photovoltaics, the authors of [34] presented forecasting intra-hour solar photovoltaic energy by assembling wavelet-based time-frequency analysis with deep learning neural networks, ref [35] proposed a hybrid model for renewable energy and load forecasting based on data mining and EWT, ref [36] presented solar and wind power generation forecasts using elastic net in time-varying forecast combinations and [37] showed combining transfer learning and constrained long short-term memory for power generation forecasting of newly constructed photovoltaic plants. For other renewable energy sources, there are articles in the literature on wind energy [33; 36; 38], hydro energy [39] and other types of renewables [40]. There are also papers from 2022 on the development of renewable energy in the individual countries, such as China [41; 42; 43], Australia [44], Turkey [45], India [46], Germany [47], Spain [48] and many more. In Poland, the above-mentioned development of capacity in photovoltaics was analyzed by [PERSON] et al. using surveys [49], by [PERSON] et al. using Regional Intelligent Specialization parameters [50] and by [PERSON] et al. using NPV analyses for rack, different size, different value of azimuth and tilt angle [51; 52]. Based on the literature review, it can be claimed that there are many new current predictions and much research about both the global and domestic use of conventional and unconventional resources. The use of individual RES is growing in some countries, but in others, the process of energy transformation, especially decreasing the share of coal energy production, is gradual. With reference to the above-mentioned world political and economic changes, the authors decided to conduct research on the current situation in Poland in the field of renewable energy and coal. Namely, this article describes research on the impact of RES development on the change in the energy generation profile in the case of Poland. The article analyzes the impact of RES on the reduction of CO2 emissions. The paper is divided into 5 sections. Section 3 describes the methodology of the research. Section 4 includes the results of the conducted study. Section 5 summarizes the paper with conclusions.