Around 1.7 million solar power plants with a total capacity of approximately 45 GWp (2017) have been installed in Germany over the past 25 years. Around 1,000,000 are solar power plants with a capacity of smaller than 10 kWp installed on residential rooftops. They build the foundation for the promising market development of small energy storage systems.
Every second newly installed residential PV-system is combined with an energy storage system to increase the amount of own-consumed PV electricity. Up until late 2018, around 120,000 households and commercial operations in Germany had already invested in a PV-battery system. According to our research, PV-battery systems could reach an annual installation volume of around 50,000 systems by 2020. Retrofit storage installations will also be a major driver for improving energy self-sufficiency in private households and commercial operations. Only 8 percent of rooftop PV systems in Germany are equipped with a battery today – by 2030 it could be well over 80 percent.
In addition to increasing own-consumption of PV electricity, batteries are increasingly used for multiple beneficial purposes
- Electricity companies are offering new tariff and service models for PV-batteries, such as electricity flat rates.
- Residential PV-batteries are interconnected into swarms to perform grid-services and generate additional income.
- The provision of control power is a viable income stream for commercial batteries.
- Commercial enterprises benefit from optimized load-profiles with their battery to decrease electricity costs and save grid fees.
|Spotlight: Solar Thermal Energy and Heat Storage
As Europe’s largest solar thermal market, Germany is looking beyond established residential applications. An emerging market for solar industrial process heat and district heating offers opportunities for players testing new business models. In the residential market, thermal storage is becoming an important buffer enabling increasing shares of renewables (solar thermal, PV, heat pumps, and biomass) to be effectively used on site.