At the start of summer, we have a large set of updates for you. These include visual changes, data improvements, and usability enhancements. The most important ones concern time changes and time zones, downloading data by selected aggregation, as well as storage and colours in generation and capacity charts.
Using the website:
- Download data by selected aggregation – no more downloading thousands of hourly or 15-minute records when you only need a monthly average!
- The date picker automatically jumps to the end date after you select the start date
- Need to paste data into your own chart? Or perhaps you want to process data programmatically and need to ensure record uniqueness (e.g. during daylight saving time transition)? Downloaded files now include a column with Polish local time in an easy-to-use date format, and a column with universal UTC time in the ISO 8601 standard
- The date format in downloaded files matches the selected aggregation – for example, when downloading monthly averages, the file will contain only a Polish time column in YYYY-MM format
- The data tooltip on charts now shows the time zone currently in effect in Poland. Note how, during the DST transition on 26.10.26, 02:00 UTC+2 is followed by 02:00 UTC+1.
Data and chart content:
- Battery energy storage has been added to the Generation capacity source: ARE chart (dark brown colour). The data comes from the Energy Market Agency’s quarterly report Sytuacja w Elektroenergetyce (“Power Industry Bulletin”). Since the visualisation is at monthly granularity, we display the same value for each month within a given quarter. Due to the publication schedule of the quarterly report, data is updated once per quarter, up to 3 months after the quarter ends. Energy generation data is not currently available at a granularity suitable for inclusion in monthly charts.
- Storage in general: across all installed capacity and generation charts (sourced both from EMA and ENTSO-E), storage is now assigned shades of brown: pumped-hydro energy storage plants in light brown, and battery storage in dark brown. Category names clearly indicate that these differ from sources that generate their own energy. Storage is excluded from percentage share charts for installed capacity and energy generation (with the exception of the ENTSO-E generation chart showing current data).
- A new category Other RES (light blue) has been added to the generation capacity and production charts (source: ARE). It groups source data from hybrid RES and other RES (unspecified) technologies. The category accounts for around 0.4% of monthly energy generation (approx. 50 GWh).
- Generation charts now indicate that both utility-scale and prosumer PV installations are included. Alongside the changes described above, the chart descriptions have been broadly revised.
- Updated ENTSO-E production data: we re-fetched three years of ENTSO-E generation data due to updates and minor errors in the source (including occasional erroneous entries showing small but noticeable PV generation at night).
- We rebuilt our databases and scripts to make them more robust against DST transitions and varying data formats provided by different data suppliers.
- We fixed several outages caused by issues in source data
We hope these improvements make the website significantly more convenient to use. More updates and fixes coming soon!
