Germany introduced its
feed-in tariff in 2000 and it later became a model for solar industry policy support in other countries. (approximately 15% of the total domestic cost of electricity). 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. Germany set a world record for solar power production with 25.8 GW produced at midday on 20 and 21 April 2015. According to the solar power industry, a feed-in tariff is the most effective means of developing solar power. 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. Municipality-level research on
EEG-supported photovoltaic installations from 2000 to 2012 found evidence of neighborhood effects: the presence of existing PV systems increased the probability and number of subsequent local installations. The study argued that these social effects could contribute to spatially inefficient deployment when fixed feed-in tariffs also encouraged installations in areas with relatively low solar radiation. 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. 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 per cent share from renewable energy sources by 2025 and a 55 to 60 per cent share by 2035. , 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. Germany subsidizes the installation of solar capacity. 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. 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. 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.
Amory Lovins from the
Rocky Mountain Institute wrote about the German
Energiewende in 2013, calling the discussion about grid stability a "disinformation campaign". == Potential ==