Wind power in Bulgaria

Wind share of total electricity consumption in Bulgaria was 2% by the end of 2010. Overall in the EU, in a normal wind year, installed wind capacity at the end of 2010 meets 5.3% of the EU’s electricity needs (10).

Hydropower in Bulgaria

For 2070-2099 compared with 1971-2000, declines in hydropower potential >15% are projected for south-eastern Europe (Balkan countries like Greece, Bulgaria, Romania, Serbia, Macedonia) (12).

Cooling water in Bulgaria

For 2070-2099 compared with 1971-2000, European countries with the largest projected increases in water temperature are: Luxembourg, Bulgaria, Poland, Hungary and Macedonia. Most of these countries are also expected to experience strong declines in low flow (Q10). The combination of strong increases in water temperature and declines in low flow are expected to be most critical for cooling water use by the energy sector in these regions (12).

Vulnerabilities Europe

Supply

The current key renewable energy sources in Europe are hydropower (19.8% of electricity generated) and wind. By the 2070s, hydropower potential for the whole of Europe is expected to decline by 6%, translated into a 20 to 50% decrease around the Mediterranean, a 15 to 30% increase in northern and eastern Europe and a stable hydropower pattern for western and central Europe (1,3,4). In areas with increased precipitation and runoff, dam safety may become a problem due to more frequent and intensive flooding events (5).

It has become apparent during recent heat waves and drought periods that electricity generation in thermal power plants may be affected by increases in water temperature and water scarcity. In the case of higher water temperatures the discharge of warm cooling water into the river may be restricted if limit values for temperature are exceeded. Electricity production has already had to be reduced in various locations in Europe during very warm summers (e.g. 2003, 2005 and 2006) (5,8).

Extreme heat waves can pose a serious threat to uninterrupted electricity supplies, mainly because cooling air may be too warm and cooling water may be both scarce and too warm (9).

Climate change will impact thermoelectric power production in Europe through a combination of increased water temperatures and reduced river flow, especially during summer. In particular, thermoelectric power plants in southern and south-eastern Europe will be affected by climate change. Using a physically based hydrological and water temperature modelling framework in combination with an electricity production model, a summer average decrease in capacity of power plants of 6.3–19% in Europe was shown for 2031–2060 compared with 1971-2000, depending on cooling system type and climate scenario (SRES B1 and A2) (11).

Overall, a decrease in low flows (10th percentile of daily distribution) for Europe (except Scandinavia) is projected with an average decrease of 13-15% for 2031–2060 and 16-23% for 2071-2100,compared with 1971-2000. Increases in mean summer (21 June - 20 September) water temperatures are projected of 0.8-1.0°C for 2031–2060 and 1.4-2.3°C for 2071-2100, compared with 1971-2000. Projected water temperature increases are highest in the south-western and south-eastern parts of Europe (11).

By the 22nd century, land area devoted to biofuels may increase by a factor of two to three in all parts of Europe (2).

Demand

It may become more challenging to meet energy demands during peak times due to more frequent heat waves and drought conditions (1). Strong distributional patterns are expected across Europe — with rising cooling (electricity) demand in summer in southern Europe, compared with reduced heating (energy) demand in winter in northern Europe (7).

References

The references below are cited in full in a separate map 'References'. Please click here if you are looking for the full references for Bulgaria.

1. Lehner et al. (2005), in: Alcamo et al. (2007)
2. Metzger et al. (2004), in: Alcamo et al. (2007)
3. Kirkinen et al. (2005), in: Anderson (ed.) (2007)
4. Veijalainen and Vehviläinen (2006); Andréasson et al. (2006), in: Anderson (ed.) (2007)
5. Anderson (ed.) (2007)
6. Rothstein et al. (2006), in: Anderson (ed.) (2007)
7. Alcamo et al., 2007
8. EEA, JRC and WHO (2008)
9. Behrens et al. (2010)
10. European Wind Energy Association (2011)
11. Van Vliet et al. (2012)
12. Van Vliet et al. (2015)