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Solar power in Germany

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Solar power Germany 2016 fact sheet: electricity generation, development, investments, capacity, employment and the public opinion.[1]
German electricity by source in 2023
Brown coalHard coalNatural gasWindSolarBiomassNuclearHydroOilOther
  •   Brown coal: 77.5 TW⋅h (17.7%)
  •   Hard coal: 36.05 TW⋅h (8.3%)
  •   Natural gas: 45.79 TW⋅h (10.5%)
  •   Wind: 139.77 TW⋅h (32.0%)
  •   Solar: 53.48 TW⋅h (12.2%)
  •   Biomass: 42.25 TW⋅h (9.7%)
  •   Nuclear: 6.72 TW⋅h (1.5%)
  •   Hydro: 19.48 TW⋅h (4.5%)
  •   Oil: 3.15 TW⋅h (0.7%)
  •   Other: 12.59 TW⋅h (2.9%)
Net generated electricity in 2023[2]

Solar power in Germany consists almost exclusively of photovoltaics (PV) and accounted for an estimated 8.2 percent of the country's gross-electricity generation in 2019.[3][4][5] About 1.5 million photovoltaic systems were installed around the country in 2014, ranging from small rooftop systems, to medium commercial and large utility-scale solar parks.[3]: 5  Germany's largest solar farms are located in Meuro, Neuhardenberg, and Templin with capacities over 100 MW.

Germany has been among the world's top PV installer for several years, with total installed capacity amounting to 41.3 gigawatts (GW) by the end of 2016,[1] behind only China. However, new installations of PV systems have declined steadily since the record year of 2011.[6] It's estimated that by 2017 over 70% of the country's jobs in the solar industry have been lost in the solar sector in recent years.[1] Proponents from the PV industry blame the lack of governmental commitment, while others point out the financial burden associated with the fast-paced roll-out of photovoltaics, rendering the transition to renewable energies unsustainable in their view.[7]

Germany's official governmental goal is to continuously increase renewables' contribution to the country's overall electricity consumption. Long-term minimum targets are 35% by 2020, 50% by 2030 and 80% by 2050.[3]: 6  The country is increasingly producing more electricity at specific times with high solar irradiation than it needs, driving down spot-market prices[8] and exporting its surplus of electricity to its neighboring countries, with a record exported surplus of 34 TWh in 2014.[9] A decline in spot-prices may however raise the electricity prices for retail customers, as the spread of the guaranteed feed-in tariff and spot-price increases as well.[3]: 17  As the combined share of fluctuating wind and solar is approaching 17 percent on the national electricity mix [citation needed], other issues are becoming more pressing and others more feasible. These include adapting the electrical grid, constructing new grid-storage capacity, dismantling and altering fossil and nuclear power plants – brown coal and nuclear power are the country's cheapest suppliers of electricity, according to today's calculations – and to construct a new generation of combined heat and power plants.[3]: 7 

Concentrated solar power (CSP), a solar power technology that does not use photovoltaics, has virtually no significance for Germany, as this technology demands much higher solar insolation. There is, however, a 1.5 MW experimental CSP-plant used for on-site engineering purposes rather than for commercial electricity generation, the Jülich Solar Tower owned by the German Aerospace Center.

History

Price of solar PV systems

History of PV roof-top prices in euro per kilowatt (€/kW).[10]

Germany was one of the first countries to deploy grid-scale PV power. In 2004, Germany was the first country, together with Japan, to reach 1 GW of cumulative installed PV capacity. Since 2004 solar power in Germany has been growing considerably due to the country's feed-in tariffs for renewable energy, which were introduced by the German Renewable Energy Sources Act, and declining PV costs.

Prices of PV systems/solar power system decreased more than 50% in the 5 years since 2006.[11] By 2011, solar PV provided 18 TWh of Germany's electricity, or about 3% of the total.[7] That year the federal government set a target of 66 GW of installed solar PV capacity by 2030,[12] to be reached with an annual increase of 2.5–3.5 GW,[13] and a goal of 80% of electricity from renewable sources by 2050.[14]

More than 7 GW of PV capacity were installed annually during the record years of 2010, 2011 and 2012. For this period, the installed capacity of 22.5 GW represented almost 30% of the worldwide deployed photovoltaics.

Since 2013, the number of new installations declined significantly due to more restrictive governmental policies.

Governmental policies

Further information: Feed-in tariffs in Germany and German Renewable Energy Sources Act

Feed-in tariff for rooftop solar[15]

History of German feed-in tariffs in ¢/kWh for rooftop solar of less than 10 kWp since 2001. For 2016, it amounted to 12.31 ¢/kWh.[15]

As of 2012, the feed-in tariff (FiT) costs about €14 billion (US$18 billion) per year for wind and solar installations. The cost is spread across all rate-payers in a surcharge of 3.6 €ct (4.6 ¢) per kWh[16] (approximately 15% of the total domestic cost of electricity).[17] On the other hand, as expensive peak power plants are displaced, the price at the power exchange is reduced due to the so-called merit order effect.[18] Germany set a world record for solar power production with 25.8 GW produced at midday on 20 and 21 April 2015.[19]

According to the solar power industry, a feed-in tariff is the most effective means of developing solar power.[20] It is the same as a power purchase agreement, but is at a much higher rate. As the industry matures, it is reduced and becomes the same as a power purchase agreement. A feed-in tariff allows investors a guaranteed return on investment – a requirement for development. A primary difference between a tax credit and a feed-in tariff is that the cost is borne the year of installation with a tax credit, and is spread out over many years with a feed-in tariff. In both cases the incentive cost is distributed over all consumers. This means that the initial cost is very low for a feed-in tariff and very high for a tax credit. In both cases the learning curve reduces the cost of installation, but is not a large contribution to growth, as grid parity is still always reached.[21]

Since the end of the boom period, national PV market has since declined significantly, due to the amendments in the German Renewable Energy Sources Act (EEG) that reduced feed-in tariffs and set constraints on utility-scaled installations, limiting their size to no more than 10 kW.[22]

The previous version of the EEG only guaranteed financial assistance as long as the PV capacity had not yet reached 52 GW. This limit has now been removed. It also foresees to regulate annual PV growth within a range of 2.5 GW to 3.5 GW by adjusting the guaranteed fees accordingly. The legislative reforms stipulates a 40 to 45 percent share from renewable energy sources by 2025 and a 55 to 60 percent share by 2035.[23]

As of November 2016, tenants in North Rhine-Westphalia (NRW) will soon be able to benefit from the PV panels mounted on the buildings in which they live. The state government has introduced measures covering the self-consumption of power, allowing tenants to acquire the electricity generated onsite more cheaply than their regular utility contracts stipulate.[24][25]

Grid capacity and stability issues

German electricity generation on 25 and 26 May 2012

In 2017, approximately 9 GW of photovoltaic plants in Germany were being retrofitted to shut down[26] if the frequency increases to 50.2 Hz, indicating an excess of electricity on the grid. The frequency is unlikely to reach 50.2 Hz during normal operation, but can if Germany is exporting power to countries that suddenly experience a power failure. This leads to a surplus of generation in Germany, that is transferred to rotating load and generation, which causes system frequency to rise. This happened in 2003 and 2006.[27][28][29]

However, power failures could not have been caused by photovoltaics in 2006, as solar PV played a negligible role in the German energy mix at that time.[30] In December 2012, the president of Germany's "Bundesnetzagentur", the Federal Network Agency, stated that there is "no indication", that the switch to renewables is causing more power outages.[31] Amory Lovins from the Rocky Mountain Institute wrote about the German Energiewende in 2013, calling the discussion about grid stability a "disinformation campaign".[32]

Potential

Map of average solar radiation in Germany. For most of the country annual average values are in between 1100 and 1300 kWh per square metre.
Solar potential

Germany has about the same solar potential as Alaska, which has an average of 3.08 sun hours/day in Fairbanks.[citation needed]

Bremen Sun Hours/day (Avg = 2.92 hrs/day)

Stuttgart Sun Hours/day (Avg = 3.33 hrs/day)

Source: NREL, based on an average of 30 years of weather data.[33]

Statistics

Annual Solar Capacity Added
Comparison of renewable technologies and conventional power plants in Germany in EuroCent per kWh (2018)[34]
The share of solar PV in the country's electricity consumption plotted against an exponential growth curve from 1990 to 2015, doubling every 1.56 years, or growing 56% annually on average. The doubling time and growth rate differ from those of average power and installed capacity as the overall consumption also increased over time. After 2012 the trend slowed down significantly, with only 8.2% of the electricity coming from solar power in 2019.

The history of Germany's installed photovoltaic capacity, its average power output, produced electricity, and its share in the overall consumed electricity, showed a steady, exponential growth for more than two decades up to about 2012. [dubious – discuss] Solar PV capacity doubled on average every 18 months in this period; an annual growth rate of more than 50 percent. Since about 2012 growth has slowed down significantly.

Generation

Year Capacity (MW) Net annual generation (GWh) % of gross electricity consumption Capacity Factor (%)
1990 2 1 2e-04 5.7
1991 2 1 2e-04 5.7
1992 6 4 7e-04 7.6
1993 9 3 6e-04 3.8
1994 12 7 0.001 6.7
1995 18 7 0.001 4.4
1996 28 12 0.002 4.9
1997 42 18 0.003 4.9
1998 54 35 0.006 7.4
1999 70 30 0.005 4.9
2000 114 60 0.01 6.0
2001 176 76 0.013 4.9
2002 296 162 0.028 6.2
2003 435 313 0.052 8.2
2004 1105 557 0.091 5.8
2005 2056 1282 0.21 7.1
2006 2899 2220 0.36 8.7
2007 4170 3075 0.49 8.4
2008 6120 4420 0.72 8.2
2009 10566 6583 1.13 7.1
2010 18006 11729 1.9 7.4
2011 25916 19599 3.23 8.6
2012 34077 26220 4.35 8.8
2013 36710 30020 5.13 9.6
2014 37900 34735 6.08 10.9
2015 39224 37330 6.5 11.3
2016 40679 36820 6.4 10.7
2017 42293 38001 6.6 10.6
2018 45158 43451 7.7 11.6
2019 48914 44334 8.2 11.1
2020 53721 48525
2021 58728 49011
Source: Federal Ministry for Economic Affairs and Energy, for capacity figures[5]: 7  and other figures[5]: 16–41 
Note: This table does not show net-consumption but gross electricity consumption, which includes self consumption of nuclear and coal-fire power plants. For 2014, net-consumption stands at approximately 6.9% (vs. 6.1% for gross-consumption).[3]: 5 
Nationwide PV capacity in megawatts on a linear scale since 1990.
Source: Federal Ministry for Economic Affairs and Energy[5]: 7 

Solar PV by type

Installed PV capacity in Germany by class size 2017[35]
<10 kW 14.2%
10–100 kW 38.2%
100–500 kW 14.1%
>500 kW 33.5%

Systems of less than 10 kW accounted for 14.2% of totalled installed capacity. These are single direct use systems, mostly residential solar pv systems. Systems rated 10–100 kW represented 38.2% of capacity and represents systems used collectively within one place such as a large residential block or large commercial premise or intensive agricultural units. The next class size of systems 100–500 kW represented 14.1% of capacity and would typically be larger commercial centres, hospitals, schools or industrial / agricultural premises or smaller ground mounted systems. The final category of systems rated over 500 kW accounted for 33.5% and mostly represent district power systems, ground mounted panels providing power to perhaps a mix of industrial and commercial sites. It is interesting to note that whilst large power plants receive a lot of attention in solar power articles, installations under 0.5 MW in size actually represent nearly two thirds of the installed capacity in Germany in 2017.

PV capacity by federal states

Watts per capita by state in 2013[36]
  10 – 50 Watts
  50 – 100 Watts
  100 – 200 Watts
  200 – 350 Watts
  350 – 500 Watts
  500 – 750 Watts
  >750 Watts

Germany is made up of sixteen, partly sovereign federal states or Länder. The southern states of Bavaria and Baden-Württemberg account for about half of the total, nationwide PV deployment and are also the wealthiest and most populous states after North Rhine-Westphalia. However, photovoltaic installations are widespread throughout the sixteen states and are not limited to the southern region of the country as demonstrated by a watts per capita distribution.

PV capacity in MW[37][38][39][40][41][42][43][44]
State 2008  2009  2010  2011  2012  2013  2014  2015 
Baden-Württemberg 1,245 1,772 2,907 3,753 5,838.0 6,111.8 4,984.5 5,117.0
Bavaria 2,359 3,955 6,365 7,961 9,700.5 10,424.7 11,099.8 11,309.2
Berlin 11 19 68 50 63.2 68.6 80.5 83.9
Brandenburg 72 219 638 1,313 2,576.1 2,711.2 2,901.0 2,981.5
Bremen 4 5 14 30 32.3 35.3 39.9 42.2
Hamburg 7 9 27 25 32.1 35.8 36.5 36.9
Hesse 350 549 868 1,174 1,520.9 1,661.8 1,768.5 1,811.2
Lower Saxony 352 709 1,479 2,051 3,045.1 3,257.4 3,490.6 3,580.4
Mecklenburg-Vorpommern 48 88 263 455 957.7 1,098.5 1,337.9 1,414.4
North Rhine-Westphalia 617 1,046 1,925 2,601 3,582.0 3,878.5 4,234.9 4,363.7
Rhineland-Palatinate 332 504 841 1,124 1,528.2 1,670.8 1,862.2 1,920.5
Saarland 67 100 158 218 318.8 365.4 407.3 415.8
Saxony 168 288 529 836 1,280.8 1,412.3 1,575.1 1,607.5
Saxony-Anhalt 94 181 450 817 1,377.9 1,556.1 1,828.7 1,962.6
Schleswig-Holstein 159 310 695 992 1,351.5 1,407.8 1,468.6 1,498.3
Thuringia 95 159 327 467 871.7 1,013.9 1,119.9 1,187.4
Cumulative total installed 5,979 9,913 17,554 23,866 34,076.7 36,710.1 38,236.0 39,332.4
Capacity added — 3,934 7,641 6,312 10,210.7 2,633.4 1,525.9 1,096.4

Photovoltaic power stations

Main article: List of photovoltaic power stations
Largest German photovoltaic power stations (20 MW or larger)[45]
PV Power station Capacity
in MW p 		Notes
Solarpark Meuro 166 70 MW completed 2011, 166 MW in 2012[45]
Neuhardenberg Solar Park 145 Completed September 2012[45][46]
Templin Solar Park 128.5 Completed September 2012[45][47]
Brandenburg-Briest Solarpark 91 Commissioned in December 2011
Solarpark Finow Tower 84.7 Completed in 2010/2011
Eggebek Solar Park 83.6 Completed in 2011
Senftenberg Solarpark 82 Phase II and III completed 2011, another 70 MW phase planned[48]
Finsterwalde Solar Park 80.7 Phase I completed 2009, phase II and III 2010[49][50]
Lieberose Photovoltaic Park 71.8 Completed in 2009[51][52]
Solarpark Alt Daber 67.8 Completed in 2011[45]
Strasskirchen Solar Park 54 Commissioned in December 2009[45]
Walddrehna Solar Park 52.3 Completed June 2012
Waldpolenz Solar Park 52 550,000 CdTe modules. Completed December 2008[53][54]
Tutow Solar Park 52 Tutow I completed in 2009, II in 2010, III in 2011
Kothen Solar Park 45 Operational since 2009
Jura Solar Park 43 Completed in 2014[55]
Jännersdorf Solar Park 40.5 Commissioned in 2012
Fürstenwalde Solar Park 39.6 Commissioned in 2011
Reckahn Solar Park 36 Completed in 2011
Perleberg Solar Park 35 Completed in 2012
Krughütte Solar Park 29.1 Completed in 2012
Solarpark Heideblick 27.5 Completed in 2011
Solarpark Eiche 26.5 Completed in 2011
Lauingen Energy Park 25.7 Completed in 2010
Pocking Solar Park 22 Completed in March 2006
Mengkofen Solar Park 21.7 Commissioned in December 2009
Rothenburg Solar Park 20 Commissioned in 2009
Other notable photovoltaic (PV) power plants[56]
Name & Description Capacity
in MW p 		Location Annual yield
in MWh 		Capacity factor Coordinates
Erlasee Solar Park, 1408 SOLON 12 Arnstein 14,000 0.13 50°0′10″N 9°55′15″E / 50.00278°N 9.92083°E / 50.00278; 9.92083 (Erlasee Solar Park)
Gottelborn Solar Park 8.4 Göttelborn n.a. n.a. –
Bavaria Solarpark, 57,600 solar modules 6.3 Mühlhausen 6,750 0.12 49°09′29″N 11°25′59″E / 49.15806°N 11.43306°E / 49.15806; 11.43306 (Bavaria Solarpark)
Rote Jahne Solar Park, 92,880 thin-film modules,
First Solar, FS-260, FS-262 and FS-265[57][58] 		6.0 Doberschütz 5,700 0.11 –
Bürstadt Solar Farm, 30,000 BP Solar modules 5.0 Bürstadt 4,200 0.10 49°39′N 8°28′E / 49.650°N 8.467°E / 49.650; 8.467
Espenhain, 33,500 Shell Solar modules 5.0 Espenhain 5,000 0.11 51°12′N 12°31′E / 51.200°N 12.517°E / 51.200; 12.517
Geiseltalsee Solarpark, 24,864 BP solar modules 4.0 Merseburg 3,400 0.10 51°22′N 12°0′E / 51.367°N 12.000°E / 51.367; 12.000 (Geiseltalsee Solarpark)
Hemau Solar Farm, 32,740 solar modules 4.0 Hemau 3,900 0.11 49°3′N 11°47′E / 49.050°N 11.783°E / 49.050; 11.783
Solara, Sharp and Kyocera solar modules 3.3 Dingolfing 3,050 0.11 48°38′N 12°30′E / 48.633°N 12.500°E / 48.633; 12.500
Solarpark Herten, 11.319 Modules from Astronergy 3 Rheinfelden 3,000 0.11 47°32′39″N 7°43′30″E / 47.54417°N 7.72500°E / 47.54417; 7.72500
Bavaria Solarpark, Sharp solar modules 1.9 Günching n.a. n.a. 49°16′N 11°34′E / 49.267°N 11.567°E / 49.267; 11.567 (Bavaria Solarpark)
Bavaria Solarpark, Sharp solar modules 1.9 Minihof n.a. n.a. –

Companies

Some companies have collapsed since 2008, facing harsh competition from imported solar panels. Some were taken over like Bosch Solar Energy by SolarWorld. Major German solar companies include:

See also

References

  1. ^ a b c "GERMANY: SOLAR POWER FACTSHEET 2016". Strom-Report.
  2. ^ Burger, Bruno (3 January 2024). Öffentliche Nettostromerzeugung in Deutschland im Jahr 2023 [Public Net Electricity Generation in Germany in 2023] (PDF) (in German). Freiburg, Germany: Fraunhofer-Institut für Solare Energiesysteme ISE. Retrieved 12 January 2024.
  3. ^ a b c d e f "Recent facts about photovoltaics in Germany". Fraunhofer ISE. 19 May 2015. Retrieved 3 July 2015.
  4. ^ "Electricity production from solar and wind in Germany in 2014" (pdf). Germany: Fraunhofer Institute for Solar Energy Systems ISE. 21 July 2014. p. 5. Archived (PDF) from the original on 22 July 2014. Retrieved 22 July 2014.
  5. ^ a b c d Bundesministerium für Wirtschaft und Energie. "Time series for the development of renewable energy sources in Germany" (xls). Retrieved 14 May 2022.
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  10. ^ Average turn-key prices for roof-top PV systems up to 100 kWp. Sources: for data since 2009 photovoltaik-guide.de, pv-preisindex , using for each year average price of month of January. Data source for previous years (2006–2008), see Bundesverband Solarwirtschaft e.V. (BSW-Solar), September 2009, page 4, quarterly figures from EUPD-Research.
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  12. ^ Property Wire (22 April 2010). "Germany Reducing Incentives For Solar Property Investment". NuWire Investor. Retrieved 10 September 2010.
  13. ^ Lang, Matthias (21 November 2011). "New German 7.5 GWp PV Record by End of 2011". German Energy Blog. Retrieved 9 January 2012.
  14. ^ Germany
  15. ^ a b "Annual Report 2015". IEA-PVPS. 13 May 2016. p. 63.
  16. ^ Lang, Matthias (14 October 2011). "2012 EEG Surcharge Increases Slightly to 3.592 ct/kWh". German Energy Blog. Retrieved 9 January 2012.
  17. ^ "Europe's Energy Portal » Fuel, Natural Gas and Electricity Prices From Past to Present".
  18. ^ Morris, Craig (2 February 2012). "Merit order effect of PV in Germany". Renewables International. Retrieved 17 May 2012.
  19. ^ "Transparency in Energy Markets – Germany".
  20. ^ "The U.S. Needs a Feed-in Tariff". www.pennenergy.com.
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  24. ^ "Federal state supports "tenant electricity" models with solar PV". Clean Energy Wire (CLEW). Berlin, Germany. 1 November 2016. Retrieved 1 November 2016.
  25. ^ "Minister Remmel: "NRW macht es vor — Mieterinnen und Mieter können künftig auch von der Energiewende profitieren." — Umweltministerium fördert Mieterstrom-Modelle und Energiespeicher" [Minister Remmel: "NRW makes it possible — tenants can also benefit from the Energiewende in the future." — Environment Ministry promotes tenant electricity models and energy storage] (Press release) (in German). Düsseldorf, Germany: Umweltministerium North Rhine-Westphalia. 31 October 2016. Retrieved 1 November 2016.
  26. ^ Lang, Matthias. "Study Recommends Retrofitting of PV Power Plants to Solve 50.2 Hz Problem". German Energy Blog. Retrieved 15 February 2017.
  27. ^ The "50.2 Hz" problem for photovoltaic power plants Archived 23 June 2012 at the Wayback Machine
  28. ^ "Timeline of the utility frequency: Timeline".
  29. ^ "Impact of Large-scale Distributed Generation on Network Stability During Over-Frequency Events & Development of Mitigation Measures" (PDF). ecofys.com.
  30. ^ Michael Döring (1 January 2013). "Dealing with the 50.2 Hz problem". Archived from the original on 13 July 2014. Retrieved 13 July 2014.
  31. ^ "Germany's Network Agency says power outages "unlikely"". 6 December 2012. Archived from the original on 13 July 2014. Retrieved 13 July 2014.
  32. ^ Amory Lovins (23 August 2013). "Separating Fact from Fiction in Accounts of Germany's Renewables Revolution". Archived from the original on 13 July 2014.
  33. ^ "PV Watts". NREL. Retrieved 1 July 2016.
  34. ^ "Studie: Stromgestehungskosten erneuerbare Energien - März 2018". Fraunhofer ISE. 2018. Retrieved 2 April 2018.
  35. ^ "EXISTING AND FUTURE PV PROSUMER CONCEPTS , pg. 18" (PDF).
  36. ^ "Global Market Outlook for Photovoltaics 2014-2018" (PDF). www.epia.org. EPIA – European Photovoltaic Industry Association. p. 24. Archived from the original (PDF) on 12 June 2014. Retrieved 12 June 2014.
  37. ^ Bundesnetzagentur – EEG-Statistikbericht 2008
  38. ^ "Bundesnetzagentur – EEG-Statistikbericht 2009" (PDF). clearingstelle-eeg.de.
  39. ^ Bundesnetzagentur – EEG-Statistikbericht 2010
  40. ^ Bundesnetzagentur – EEG-Statistikbericht 2011
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  42. ^ "Bundesnetzagentur – EEG in Zahlen 2013". bundesnetzagentur.de.
  43. ^ Bundesnetzagentur – EEG in Zahlen 2014
  44. ^ "Bundesnetzagentur – Installierte EE-Leistung zum 31.12.2015 (vorläufig)" (PDF). bundesnetzagentur.de.
  45. ^ a b c d e f PV Resources.com (2009). World's largest photovoltaic power plants
  46. ^ "Contract for services". LIMA Group GmbH.
  47. ^ CFB News: Commerz Real Acquires Germany's Largest Solar Park. "CFB-Fonds".
  48. ^ "SolarServer: 78 MW of the world's largest solar photovoltaic plant connected to grid in Senftenberg, Germany".
  49. ^ "Good Energies, NIBC Infrastructure Partners acquire Finsterwalde II and Finsterwalde III". pv-tech.org.
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  53. ^ "Germany's largest Solar parks connected to the grid (19 Dec 08)" (PDF). juwi.de.
  54. ^ "Large photovoltaic plant in Muldentalkreis". sonnenseite.com.
  55. ^ Photovoltaik in Oberfranken: IBC SOLAR stellt Jura-Solarpark mit insgesamt 43 MW fertig; Energiewende soll den Wirtschaftsstandort auch künftig stärken, 26 February 2014
  56. ^ "Large-Scale Photovoltaic Power Plants – Top 50".
  57. ^ Construction Complete on 6 MW Thin-Film PV Installation in Germany Renewable Energy Access, 5 April 2007.
  58. ^ https://www.webcitation.org/6QwLVgSYo?url=http://www.photovoltaik-im-web.de/Rote_Jahne.pdf Rote Jahne Factsheet (de)
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