Snapshot of photovoltaics March 2021

For the past 10 years, photovoltaic electricity generation has been the fastest-growing power generation source worldwide. It took almost six decades to achieve 100 GWof solar energy capacity in 2012, but the 1 TW barrier is likely to be broken during 2022. Despite the ongoing COVID-19 pandemic, the overall investments in solar energy have increased by 12% to USD 148.6 billion (EUR 125 billion). In 2020, more than 135 GW of new solar photovoltaic electricity generation capacity was installed. The recovery of China, the continuous growths in Europe and the USA as well as new emerging markets were the main drivers. The number of countries installing more than 1 GW annually has increased to 18 in 2020. The continuation of price reductions in the battery storage sector has again resulted in a growingmarket for local battery storage systems in solar farms as well as decentralised photovoltaic electricity generation systems. Apart from classic electricity use, renewable electricity for the generation of green hydrogen will become more and more important in the


Introduction
After the 25th session of the Conference of the Parties (COP25) in Madrid, Spain, in December 2019 failed to reach an agreement on the urgent pathways to decarbonise the world's energy supply by 2050, the attention shifted to COP26 in Glasgow, UK, in November 2020. However, due to the ongoing COVD-19 pandemic, the meeting was postponed to November 2021 and no international agreement has yet been reached.
When the International Energy Agency (IEA) launched its latest World Energy Outlook Report (WEO 2020) in October 2020, one of the headlines read "Solar becomes the new king of electricity…" [1,2]. Another key message linked to the COVID-19 effect indicates thatglobal energy demand would drop by 5%, energy related CO2 emissions by 7% and overall energy investments by 18%. Of all the presented pathways, only the "Net Zero Emissions by 2050" scenario is in line with the Paris Agreement. The crucial timespan to achieve globally 40% greenhouse gas (GHG) emissions reduction by 2030 starts now. To achieve this goal, renewable sources must provide 60% of the global electricity generation, which is more than doublethe percentage in 2019 (27%), and rising in terms of total electricity generation, as the latterwill increase from 26 942 TWh in 2019 to 34 123 TWh in 2030. This scenario requires an increase inrenewable electricity generation from 7 274 to 20 474 Wh within the same timeframe.
One of the key technology options, apt for scalability in a short period of time, is solar photovoltaics (PV), which can be deployed in a modular way almost everywhere on this planet. Solar resources across the world are abundant and cannot be monopolised by one country.
According to the "Net Zero Emissions by 2050" scenario of the WEO 2020, the worldwide installed PV capacity would need to increase to 1840 GW 1 by 2025 and 3929 GW by 2030. In such a scenario solar photovoltaic electricity would account for about 5420 TWh or 15.9% of the worldwide energy supply. This quantity is almost double the amount modelled in the "Stated Policies Scenario" with 2764 TWh. However, even the "Net Zero Emissions by 2050" scenario still falls short compared to more ambitious scenarios, which call for 100% renewable electricity or even a 100% renewable energy supply by 2050 [3][4][5].

PV solar cell production
In 2020, the production data for the global cell production 2 varied between 140 and 160 GW and could exceed 200 GW in 2021. The significant uncertainty in this data is due to the highly competitive market environment, as well as the fact that some companies report shipment figures, some report sales, while others report production figures. A detailed description of the uncertainties in production and deployment statistics has already been published in earlier versions of this report [6].
The data presented, collected from stock market reports of listed companies, market reports and colleagues, were then compared to various data sources, which led to an estimate of 147 GW (Fig. 1), representing an increase of about 12% compared to 2019.
Over the past decade, solar system hardware has seen a steep price decline, which, coupled with fierce competition amongst the manufacturing companies along the solar value chain, resulted in an ongoing consolidation in the solar industry. At the beginning of 2021, Bloomberg New Energy Finance reported that they tracked more than 700 companies along the crystalline silicon value chain i.e. polysilicon, wafer, solar cells and module manufacturing [7]. Due to the plant complexity and technological challenges, polysilicon and wafer factories have the highest investment costs as wellas the longest construction time. Therefore, the consolidation in these two value chain segments is the highest. On the other hand, new factories are more competitive due to lower production costs. Solar cell and module manufacturing plants are more modular and can be built faster, thus offering more flexibility to react to technology progress or impacts of policy decisions, like local content rules and import tariffs.
Another interesting fact is that about 90% of new polysilicon capacities as well astwo-thirds of the current manufacturing capacity for silicon modules, which surpasses 250 GW, were only commissioned after 2017 [7].
In order to realise any of the various scenarios to limit global warming to 1.5°C, as pledged in the Paris Agreement, the scale-up of renewable energy deployment and acceleration of the energy system decarbonisation over the next decade is crucial. The annual increase in manufacturing output required depends on the ambition of the scenario. An increase from almost 150 GW in 2020 to about 550 GW would be necessary for the WEO 2020 scenario or above 2.5 TW for a 100% renewable energy scenario. This huge challenge raisesthe question of whether PV technology and the industry are ready for it.
In the past decade, the global production of the solar photovoltaic manufacturing industry has increased from 21 GW in 2010 to almost 150 GW in 2020 with a compound annual growth rate (CAGR) of more than 21%. A continuation of this trend, which is technologically feasible, would lead to an annual production of over 1 TW in 2030 [8][9][10]. To reach the 100% renewable energy benchmark of 2.5 TW, annual production CAGR would have to increase to 33%.

Solar PV electricity generation and markets
Over the past few years, the CAPEX for PV solar systems have converged globally. However, differences in market 2 Solar cell production capacities mean: -In the case of wafer silicon based solar cells, only the cells -In the case of thin-films, the complete integrated module -Only those companies which actually produce the active circuit (solar cell) are counted -Companies which purchase these circuits and make cells are not counted. size and local competition can still lead to significant variations. Factors like import taxes, local content rules or existing tax credits have an additional influence on local prices. A global benchmark for the levelised cost of electricity (LCOE) is published regularly by BNEF. In the 2nd half (H2) of 2020, this benchmark for utility scale PV systems was USD 47 per MWh for non-tracking and USD 39 per MWh for tracking systems [11].
In the past 10 years, lithium-ion battery packs have shown a learning rate of 18% and a price decreased of 89%. The corresponding levelised cost of electricity storage (LCOES) for battery systems ranges between USD 120 and 143 per MWh for a 4-h storage system and between USD 167 and 193 per MWh for a 1-h storage system. The short time (1 h) battery storage systems are most suited to provide balancing services as well as capacity. Their role can be compared to open-cycle gas turbines, which run infrequently for a maximum of 1 h per day. On the other hand a 4 h storage runs on a daily cycle providing electricity during times when the PV system is not generating. There are indications that the LCOES can be even lower with a 6 h storage system [12].
This price development as well as various incentive programmes have increased the number of residential and commercial PV projects with storage. In large scale PV plants the addition of storage is mainly driven by the goal to utilise the AC connection as efficiently as possible. In 2020 about 4.5 GW of new energy storage capacity was added and 2021 predictions point to a range of 10 GW [13].
Compared to the benchmark LCOE mentioned before, the local electricity generation costs from photovoltaic systemsare determined by a number of additional factors. Geographical and technology factors like solar radiation, tracking or no-tracking PV system design, string or central inverter configuration, fixed operation and maintenance (O&M) as well as connection costs are important.
However, one of the most relevant factors is the financial aspect of a project [14]. The share between debt and equity as well as interest rates and return on equity expectations has great influence and can differ substantially from country to country.
Despite the ongoing COVID-19 pandemic, global investments in renewable energy slightly increased by 2% to USD 303.5 billion [15]. Investments into new solar capacity increased by 12%, reaching USD 148.6 billion. Preliminary data show that the new PV capacity increased by about 20% to almost 140 GW in 2020 (Fig. 2), which is towards the upper end of the conservative and optimistic forecasts [16,17]. For 2021, market forecasts are considerably higher, which would bring the total cumulative installed PV capacity to more than 900 GW (Fig. 3). It should be noted that some optimistic scenarios forecast capacity additions of 200 GW or more.
China currently has a cumulative installed capacity of more than 250 GW, representing roughly one third of the total global 775 GW installed PV capacity. The European Union (EU27) follows with about 18% or 138 GW and the USA with almost 95 GW (Fig. 3).

Africa
During the past decade, the total installed solar PV capacity has increased by two orders of magnitude from about 110 MW in 2010 to 12 GW at the end of 2020. The main drivers for this growth were Algeria, Egypt, Morocco and South Africa, which now account for roughly 60% of the total capacity. The continent has vast solar resources but hydropower is still the largest source of renewable electricity generation, with hydro dams supplying 17% of the demand. However, water scarcity and climate change could hamper future expansion. In a recent study, floating PV was presented as a potential alternative to expand the A. Jäger-Waldau: EPJ Photovoltaics 12, 2 (2021) electricity generation of hydro dam plants [22]. Covering just 1% of the total surface of existing reservoirs could increase the total electricity output of these plants by 50%.
An important tool to finance large solar PV projects in Africa is the World Bank's Scaling Solar programme [23]. So far, six African Nations, Côte d'Ivoire, Ethiopia, Madagascar, Senegal, Togo and Zambia have signed financing agreements.
In 2018 the Africa Development Bank (AfDB) launched an initiative called "Desert to Power", which aims to deploy 10 GW solar power for the 250 million people across the Sahel zone. On 16 September 2019, on the occasion of the G5 Sahel summit in Ouagadougou, the heads of state gave strong support to this initiative. In December 2020, the AfDB released the first grants with a value of USD 6.5 million for projects in Chad, Burkina Faso, Niger, Mauritania and Mali through the Sustainable Energy Fund for Sustainable Africa (SEFA) [24].
With 2 GW AC power, the Benban solar complex is currently the largest solar project in Africa, located near Aswan in upper Egypt. The Benban project consists of 41 individual plants, of which 31 have a 50 MW AC (64 MW DC ) capacity each, whereas the remaining 10 projects have different capacities, due to the shape of the area [25].

Americas
Following a growth of more than 25% in the combined North and South American markets, new solar photovoltaic power capacity of about 27 GW was added in 2020. The three largest markets in 2020 were the USA (19 GW) Brazil (3.9 GW) and Mexico (1.5 GW). Currently, the Americas have an overall installed capacity of 120 GW, of which more than 75% is in the USA alone. For 2021, market forecasts indicate the possibility of reaching more than 30 GW.

Asia & pacific region
In 2020, China installed more than 48 GW of new solar photovoltaic power generation capacity, according to the New Energy Administration [26]. On the other hand, India experienced a strong decline in new installations to less than half the capacity installed in 2019. This development is mainly due to the widespread disruptions caused by the COVID-19 pandemic. Strong and stable markets in Australia, Japan, South Korea and Vietnam helped the Asian-Pacific PV market grow by 20% to 86.6 GW. For 2021, a further 20% growth is possible, which would lift the annual market above the 100 GW level.

European Union
Two major political events reshaped the renewable energy market in the European Union. The first was that the United Kingdom left the European Union on 31 January 2020, after 47 years of EU membership. The second was the announcement of the European Green Deal in December 2019, which was eventually adopted by the European Council in December 2020 [27].
In September 2020, the European Commission proposed to raise the 2030 climate targets, aiming at 55% GHG reductions by 2030. The accompanying impact assessment [28] showed that such an increase in climate ambition is realistic and economically feasible. The 55% GHG reductions target will require a share of renewable energy of around 38.5%, according to the impact assessment, including the installation of additional PV capacities between 325 and 375 GW in the time frame 2020-2030 [29]. Thus, to achieve this goal, the PV market volume in the EU would have to grow between three to five times compared to 2020 levels. However, these numbers could double if the electricity demand rises faster than what current projections indicate [30].
Despite the COVID-19 pandemic, preliminary data show that the annual market continued its moderate growth in the European Union (EU27) to about 18.2 GW in 2020. The top three countries were Germany (5.0-5.2 GW), the Netherlands (2.9-3.1 GW) and Spain (2.5-2.7 GW). A newcomer in the GW markets is Poland, which installed between 1.6 and 1.8 GW. Five more countries installed more than 500 MW in the year 2020, namely Belgium, France, Hungary, Italy and Portugal.

Conclusions
Currently, solar photovoltaic electricity generation is often the lowest cost generation source and the number of countries where this holds true is growing. This reality coupled with significant potential for further cost reduction will drive the growth of PV installations in the coming decades. Various PV industry associations, non-governmental organisations (NGO), like Greenpeace, the Energy Watch Group, Bloomberg New Energy Finance (BNEF), the International Energy Agency as well as the International Renewable Energy Agency (IRENA), have developed scenarios for the future growth of PV systems [1, [31][32][33][34][35][36]. The different deployment figures of these scenarios are shown in Table 1. Between 2016 and 2020, the predicted PV capacity in the IEA World Energy Outlook has significantly increased. Pre 2015 scenarios can be found in the JRC PV Status Reports [37,38].
It is interesting to note that in 2020 some of the scenario numbers were already exceeded (red figures).
All scenarios show vast growth potentials for PV power in the future, regardless of the existing differences in the deployment pathways and ambitions. To supply the 2019 global electricity generation of 26 942 TWh with solar PV would require about 19 500 GW of PV capacity and approximately 0.3% of the world's land area would be required. Various studies have shown that vast unused generation potentials exist on rooftops, facades, dual use of infrastructure, brownfield or novel applications like agriphotovoltaics or floating PV systems [22,[39][40][41][42][43].
Key to all is an enabling policy framework and the support of all stakeholders. No fundamental system change needed for the energy transition, including the massive deployment of solar, will happen by itself. To stay on track for a maximum of 1.5°C global temperature increase, our societies have to acknowledge the need of an accelerated energy transition towards a netzero carbon energy supply by 2050. Solar photovoltaics is a crucial pillar to achieve this due its very low (based on a full life cycle analysis) CO 2 footprint, its modularity, and its "no emission no pollution" function that make it a perfect solution for a dense urban environment [44]. The number of barriers ranging from perception, legal and regulatory conditions as well as technical limitations of the existing transmission and distribution systems is still high. So far, neither the political will to accelerate the use of renewable energy sources such as PV nor the necessary adaptation and transformation of the energy networks is in line with the urgency to decarbonise our energy supply by 2050.

Disclaimer
The views expressed are based on the current information available to the author and may not in any circumstances be regarded as stating an official or policy position of the European Commission.