In recent days, a video released by a digital influencer circulated widely on social media, stating that consumers with photovoltaic systems would be prohibited from generating their own energy and that the solar source could only be used between 19 pm and 5 am in Cemig's concession area.
The content generated great repercussion and was shared by several people, including Senator Cleitinho Azevedo (Republicans).
The topic covered in the video was power flow inversion, a relevant technical challenge for the sector and has been a subject of debate in recent years.
However, the information presented does not bring any new facts in relation to what is already happening in Cemig's concession area.
O Canal Solar, in its role of defending accurate and quality information, produced this report after receiving a series of reports from consumers who were willing to generate their own energy in Minas Gerais, but who, after watching the video, gave up on that decision.
What really happens?
Since 2022, energy companies have limited the possibility for consumers to inject energy generated by their photovoltaic systems into the distribution grid in some specific regions.
These companies, including Cemig, claim that the limitation due to power flow inversion would be occurring due to an overload on the network between 6 am and 18 pm, precisely during the period of solar energy generation.
However, this does not mean that solar energy consumers in the distributed generation segment can no longer generate their own energy.
This is because, the very ANEEL (National Electric Energy Agency) regulated that denials due to flow inversion can only occur if the energy concessionaire presents detailed technical studies that prove such violation.
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In addition, the Agency also regulates three situations in which the flow inversion analysis by energy concessionaires must be waived, through the Normative Resolution No. 1.098/2024.
The first of these is for grid zero installations (with or without batteries), the second for when the distributed microgeneration system meets the free criteria (observing simultaneity), and the third in cases of systems with power lower than 7,5 kW, the so-called fast track, as explained in the report below:
What does Cemig say?
Sought by the report of the Canal Solar, Cemig has spoken out on the subject. Check out the full statement from the electricity company below:
“Cemig clarifies that energy production via distributed generation in the solar model occurs during the day, with sunlight. After the connection request, Cemig analyzes whether the local grid can the connection of a new generation point. In cases where the grid cannot it, there is a risk of flow inversion, which is a generation greater than the consumption demanded.
In these situations, the applicant can store the energy generated and use it at night. Therefore, considering the safety of the electrical system, Cemig follows the determination of the National Electric Energy Agency (Aneel). That said, there is no generation of 'lunar energy'.
Among the consequences of flow reversal, the following stand out: overloading of substation transformers, interruption of power supply, overvoltage in distribution networks, reduction of useful life and damage to electrical network equipment, seriously compromising the quality of supply to customers.
It is important to emphasize that Cemig, which is the national leader in solar generation connections, has connected approximately 308 thousand installations to its electricity grid, with an installed capacity of around 4,3 GW. This number shows the effort of the company, which is responsible for connecting all this energy to the system and distributing it to consumers.”
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Answers of 5
We cannot ignore the problems of flux inversion at times of mini GD peaks, however the formula imposed by ANEEL Meeting the free of charge criterion is unfair, as it limits a residence's generation to 46% of the average monthly consumption using its own formula for calculating monthly production of 115,2 hours per month through a “factor”, which is basically the Simultaneity of consumption, difficult to achieve outside of the industry that consumes mainly during the day. The “Fast Track concession, for up to 7,5 kW of inverter, in practice limits the microproduction of DG to less than 864 kWh/month regardless of the residence. It is a limiting criterion that forces the not to inject into the average monthly calculation.
The cost and constraints are not just for solar, but for GDMM in general, all forms that parallel the grid, or use the grid. In , the use of solar power grids is 100% subsidized by the STATE; those who generate at home pay nothing. In China, Canada, and many other countries, the option here was to privatize, and the private sector wants to MAKE A PROFIT. In Canada, the system is 100% STATE-OWNED, with hydropower, thermopower, grids, and their energy costs much less, without taking taxes into (with taxes, the difference would be even greater). The result is that, with the application of the same technology, energy for industry costs half as much, for residences 1/5, and this difference increases even more depending on the tariff flag. In Canada, energy is cost + remuneration rate for maintenance and expansion + R&D. Not here. Here, they invest less than there and defend the private sector's PROFIT, the shareholders' PROFIT. s only pay. If this makes it impossible for them to move manufacturing to Canada or another country, in favor of the private sector, we reap deindustrialization. And now the solution will be batteries, which generate enormous environmental liabilities, and those who manufacture and sell them will not be responsible for the reverse logistics bill, which will be knocking on the door in less than 10 years (it is even possible that some private companies will start selling batteries, a great business for those who sell them). In the country that is the largest multi-energy power on the planet, there is a lack of wisdom in the basis of national competitiveness, to preserve the PROFIT of the private sector.
It is regrettable that once again the voice given to Internet “influencers” negatively overrides the common sense that is so necessary in our daily lives.
In this case, the situation is worse, because the incorrect and distorted information that was circulated was provided by a professional in the field. An unbridled desire for clicks on the Internet plus irresponsibility, this is the only way it could end.
Let us not forget the infamous “Sun Tax”, which caused a huge loss of opportunities in the photovoltaic energy sector, when it was irresponsibly used by people and professionals without knowledge of what it was talking about.
It is unfortunate that this continues to happen.
Perfect. The vast majority of homes are below this 7,5kWp cutoff line.
Dear friends, when I read it, I realized it was fake news. Unfortunately, the internet has allowed the creation of these strange figures called influencers. All you have to do is put a watermelon around your neck and start doing a weird dance and then you'll have a million followers. But if there's news that a scientist discovered something spectacular for the benefit of society as a whole, half a dozen people like it or/and share it. It's the famous inversion of values. These TV talk shows are one of the biggest propagators.