Solar energy
With record temperatures and heavy use of air conditioning, fans, and appliances, electricity bills in Rio de Janeiro tend to rise significantly during the summer. Consumers served by Light and Enel Distribuição Rio feel the impact of higher consumption as well as tariff flags, which increase the price per kilowatt-hour during periods of high demand.
In this context, solar energy Subscription-based electricity is emerging as an efficient alternative to reduce electricity bills without the need to install solar panels on the property. According to an article published by Diário do Rio on February 24th, the model allows consumers to use credits generated by solar power plants and receive direct discounts on their monthly bill, while maintaining normal supply from the utility company. It is a practical, sustainable solution that is increasingly common in Rio de Janeiro and throughout the country.
Subscription-based solar energy is based on a shared distributed generation model, regulated by the National Electric Energy Agency. Instead of installing solar panels on the roof, the consumer becomes a participant in a remote solar power plant.
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Specialized companies build and operate solar farms in areas with high levels of solar radiation. The energy produced is fed into the distributor’s grid and converted into credits. These credits are then directly deducted from the electricity bill of the customer who has signed up for the plan.
In Rio de Janeiro, consumers continue to be served by Light or Enel Distribuição Rio. The difference is that part of the consumption is now offset with solar energy credits. There are no construction works, meter replacements, or any intervention in the property.
The contracting process is usually simple. The company analyzes the electricity bill history, defines a plan compatible with the average consumption, and formalizes the agreement digitally. From then on, credits begin to appear automatically on the bill.
The increase in electricity bills during the summer is not just a consumer perception. It is related to technical and regulatory factors. With high temperatures, the simultaneous use of air conditioners, freezers, fans, and other electrical equipment increases. This raises the demand on the National Interconnected System. When necessary, thermoelectric power plants are activated, which have a higher generation cost.
The tariff flags, defined by ANEEL (Brazilian Electricity Regulatory Agency), indicate precisely these additional costs. When they are at the red level, for example, there is an extra charge per kilowatt-hour consumed. In the summer, the combination of high consumption and the possibility of activating thermoelectric plants puts even more pressure on the electricity bill in Rio de Janeiro. In this scenario, solar energy by subscription reduces exposure to fluctuations in the variable portion of the bill, making expenses more predictable.
The main motivation for those seeking solar energy through subscription is cost savings. According to information released by companies in the sector and by ABSOLAR, the average reduction in the electricity bill can vary between 10% and 25%, depending on the consumption profile and the plan contracted.
In practice, a residential consumer who pays R$ 400 per month can save up to R$ 100, depending on the percentage discount applied to the offset energy. Small businesses and companies, with higher consumption, tend to obtain even more significant reductions.
It’s important to emphasize that the subscription doesn’t completely eliminate the electricity bill. Charges such as public lighting, network usage, taxes, and regulatory fees continue to be levied by the utility company. The discount applies to energy offset with solar credits. Even so, the recurring savings throughout the year, especially in the summer, can represent significant relief for a family or business budget.
The growth of solar energy in the state is backed by impressive figures. According to ABSOLAR, Rio de Janeiro has already accumulated R$ 3,5 billion in investments in the sector. The state ranks 9th nationally, accounting for 4,1% of the country’s installed capacity.
The data also indicates more than 77 solar connections in operation and 666 MW of installed capacity. Furthermore, the sector has already generated 19,9 jobs and collected approximately R$ 1,2 billion in taxes.
These numbers show that solar energy has ceased to be a trend and has become a concrete part of the Rio de Janeiro state’s electricity grid. The growth of the infrastructure enables models such as subscriptions, expanding access to renewable energy for those who cannot invest in their own panels.
Solar farms in Rio de Janeiro are mainly concentrated in the North Fluminense region, the Lakes Region, and areas of industrial expansion. Campos dos Goytacazes leads the state ranking in solar energy capacity and has established itself as a clean energy hub. In the capital, in Santa Cruz, is located the Solário Carioca, a public power plant installed in a former landfill, with more than 9.240 solar panels.
Casimiro de Abreu is home to the Casimiro Photovoltaic Plant, connected to Enel RJ, while São João da Barra is experiencing expansion with new ventures and projects linked to the industrial sector. Itaboraí has received projects such as the Toucan I Power Plant, with 1,4 MW, and continues with new initiatives under construction. Porto Real has a photovoltaic plant with more than 10.000 modules installed.
These structures are fundamental to the operation of subscription-based solar energy, as they generate credits that offset consumers’ electricity bills.
Solar energy subscription is suitable for apartment dwellers, tenants, and people who cannot install solar panels on their roof. It is also advantageous for those with electricity bills starting at R$250 to R$300 per month, an amount that many companies consider the minimum consumption to qualify for the discount.
For those with very low consumption, the savings tend to be smaller. However, businesses with higher energy demands, such as shops, schools, and offices, may see a significant impact on their operating costs.
In Rio de Janeiro, where summers are usually intense, the predictability offered by the model becomes an important advantage. Consumers reduce some of the variation in their electricity bills and are able to better plan their expenses.
In the traditional supply model, the consumer buys all the energy directly from the distributor. They are fully subject to tariff adjustments, surcharges, and seasonal variations.
In solar energy subscriptions, the distributor remains responsible for energy delivery and infrastructure. However, part of the consumption is offset by credits generated in solar power plants.
The result is an electricity bill that is partially protected from the fluctuations of more expensive generation. There is no initial investment, nor is there a need for financing or equipment maintenance. This format expands access to solar energy in Rio de Janeiro, democratizing the use of renewable energy sources even in rented properties or apartments.
With increasingly high temperatures and a greater reliance on electrical equipment, electricity bills have become one of the main expenses during the summer in Rio de Janeiro. Solar energy subscriptions are establishing themselves as a simple and sustainable solution to address this situation.
Regulated by ANEEL and backed by investments of R$ 3,5 billion in the state, the sector already accounts for 666 MW of installed capacity, more than 77 solar connections, and 19,9 jobs generated. These numbers reinforce the maturity of the market in Rio de Janeiro.
For the consumer, the logic is straightforward: reduce their electricity bill by 10% to 25% without installing panels, without construction work, and with a digital contract. In a context of tariff flags and high demand in the summer, solar energy by subscription presents itself as a strategic alternative to save money, gain predictability, and actively participate in the energy transition.
Hilton Fonseca Liborio is a copywriter with experience in digital content production and SEO skills. He creates optimized texts for different audiences and platforms, striving to combine quality, relevance, and results. He specializes in the automotive industry, technology, careers, renewable energy, mining, and other topics. Contact and pitch ideas: hiltonliborio44@gmail.com
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