Brazil’s relatively high residential electricity prices are one of the main reasons rooftop solar has expanded so rapidly. In many parts of the country, residential consumers face elevated retail electricity rates due to a combination of distribution costs, taxes and surcharges, and cross-subsidies embedded in the tariff structure, designed to subsidise the low tariffs paid by low-income residential dwellings. As a result, households can often offset electricity that costs approximately $0.15–0.30 per kWh, depending on location and tariff, allowing solar systems to achieve attractive payback periods (typically 3 to 5 years). The introduction of net metering in 2012, coupled with a sharp acceleration in adoption after 2020, drove substantial growth in solar photovoltaic generation. As a result, solar PV rose from the seventh largest to the second-largest component of the country’s energy mix. This contrasts with several neighboring countries. Argentina and Bolivia have historically maintained heavily subsidized electricity prices, reducing the economic incentive for rooftop solar. Paraguay benefits from some of the lowest electricity costs in the world thanks to the Itaipu hydropower plant, while Peru’s residential tariffs are generally more moderate. Chile has comparatively higher electricity prices, but other market and regulatory barriers have constrained residential solar adoption. When grid electricity is already inexpensive, the economic case for rooftop solar becomes significantly less compelling.
Brazil created a very favorable net-metering system
A key factor behind Brazil’s rooftop solar boom was the creation of a highly favorable net-metering framework. For many years, distributed generation regulations allowed homeowners to receive nearly full credit for excess electricity exported to the grid, substantially improving the economics of residential solar projects. This regulatory stability gave households confidence that they would be able to recover their investments, while also providing banks with a reliable basis for financing solar installations and enabling installers to scale their operations. The result was a rapidly expanding residential solar market supported by both consumer demand and access to capital. In contrast, many neighboring countries adopted distributed generation policies later or implemented less generous compensation mechanisms, reducing the financial attractiveness of rooftop solar and slowing market development. Consequently, Brazil stands out globally: nearly 70% of its installed solar PV capacity (over 70 GW) consists of small-scale distributed generation systems, with rooftop installations accounting for roughly 80% of that capacity.
Financing became widely available
A further major driver of Brazil’s residential solar market has been the widespread availability of financing. In many ways, Brazil’s advantage lies not only in its abundant solar resources but also in its ability to make solar systems financially accessible to households. Over time, the country developed a robust ecosystem of solar-specific loans, consumer financing programs, and installment plans that often extend five to ten years or more. As a result, many homeowners can purchase solar systems with monthly payments that are roughly equivalent to, or even lower than, the savings generated on their electricity bills. This significantly reduces the upfront cost barrier that often limits adoption. By contrast, several neighboring countries have less developed consumer credit markets, higher borrowing costs, and fewer dedicated solar financing products. Consequently, even when equipment prices are similar, differences in financing availability can lead to dramatically different rates of solar adoption.
Massive market scale lowered installation costs
The rapid growth of Brazil’s distributed solar sector has also created a powerful scale advantage that continues to lower installation costs. Today, Brazil has one of the largest absolute and per capita rooftop solar markets outside Australia, North America, Europe, and China, and this market size has fostered a highly competitive ecosystem of installers, suppliers, and service providers. There are more than 30 thousand PV system integrators scattered all over the country. Greater competition has helped improve supply chains, reduce labor costs per project, and lower customer acquisition expenses, all of which contribute to more affordable solar installations for consumers. As thousands of firms compete for market share, efficiency increases and prices tend to decline further, reinforcing the market’s growth. In contrast, countries such as Argentina, Paraguay, and Peru have much smaller residential solar industries and therefore benefit less from these economies of scale, making solar installations relatively more expensive and slowing adoption.
Brazil imports huge volumes of Chinese equipment
Brazil’s widespread adoption of solar has also enabled it to benefit from substantial economies in equipment procurement. Like most countries, Brazil relies heavily on solar modules, inverters, and other components manufactured in China. However, what distinguishes Brazil is the sheer volume of its imports. High demand has allowed distributors and installers to secure more favorable pricing from suppliers, establish efficient distribution networks, maintain local inventories, and develop extensive technical expertise throughout the industry. These advantages help reduce logistical costs, shorten installation timelines, and improve overall project efficiency. As a result, the total installed cost of residential solar systems is often lower than in neighboring markets where import volumes are smaller and supply chains are less developed.
The electricity grid creates opportunities
The characteristics of Brazil’s electricity system have also created favorable conditions for the growth of distributed solar generation. As a vast country with long transmission distances and regional grid constraints, Brazil faces challenges that can increase system costs and contribute to electricity price volatility. In addition, the country’s heavy reliance on hydropower makes electricity prices vulnerable to periodic droughts, which can reduce reservoir levels and require the use of more expensive backup natural gas generation. These factors have encouraged many consumers to view rooftop solar not only as a way to lower electricity bills but also as a means of reducing dependence on the grid and insulating themselves from future tariff increases. By contrast, Paraguay benefits from abundant and low-cost hydroelectric generation from power plants such as the Itaipu Dam and the Yacyretá Dam, which helps keep electricity prices exceptionally low and reduces the economic incentive for widespread residential solar adoption.
Why Chile is the interesting exception
Chile represents an interesting exception in the South American solar landscape. The country possesses some of the world’s best solar resources, particularly in the Atacama Desert, where solar irradiation levels are among the highest on Earth. Yet, unlike Brazil, Chile’s solar expansion has been driven primarily by utility-scale projects, power supply for the mining sector, and large commercial installations rather than widespread residential rooftop adoption. These segments have benefited from strong demand for large-scale renewable energy and favorable project economics in regions with exceptional solar conditions. While Chile’s residential solar market has grown steadily in recent years, it has not achieved the same broad-based, mass-market penetration seen in Brazil, where supportive policies, financing availability, and market scale have made rooftop solar accessible to a much larger share of households.
The key point is that Brazil’s success is not mainly because it has more sun. Northern Chile, southern Peru, and much of Paraguay have solar resources that are just as good or better. The decisive factors have been electricity prices, financing, regulation, and market scale, which together made rooftop solar a compelling household investment in Brazil.
Authors: Prof. Ricardo Rüther (UFSC), Prof. Andrew Blakers /ANU
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ISES, the International Solar Energy Society is a UN-accredited membership NGO founded in 1954 working towards a world with 100% renewable energy for all, used efficiently and wisely.
The views and opinions expressed in this article are the author’s own, and do not necessarily reflect those held by pv magazine.
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