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100% solar?

Rafael Herzberg's picture
Consultant energy affairs, Self employed

Rafael Herzberg- is an independent energy consultant, self-employed (since 2018) based in São Paulo, Brazil* Focus on C level, VPs and upper managers associated to energy related info, analysis...

  • Member since 2003
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  • Aug 24, 2022

100% solar?

Imagine a scenario in which all consumers install solar systems to meet their electric energy needs.

During the day they would produce surpluses that are exported to the local public electricity grid so that at night they could import their needs.

This is how the accounting is done, per kWh transacted ("net metering").

But... there is no viability for the public energy network. There is no income to amortize its investments and operating and maintenance costs throughout its value chain, including generation, transmission and distribution.

In other words, the public electric grid is used to make solar energy viable but has no remuneration!

What has been done so far in Brazil? These revenues that no longer exist are offset by tariff increases for all. That is to say that the more solar is introduced, the greater the cost of those that do not install solar.

The challenge increases as solar takes a larger share of the power matrix.

Julian Silk's picture
Julian Silk on Aug 24, 2022

Dear Rafael,

I may have more to say about Brazil later.  The obvious point is for some companies to cooperate with the PV suppliers, to be able to earn something, and to have some capacity to replace or care for the PV cells.

But you may find the following relevant:


Rafael Herzberg's picture
Rafael Herzberg on Aug 24, 2022

Hi Julian, when this investion becomes commercialy available it may imporve and a lot the renewable-solar scenario!

Jim Stack's picture
Jim Stack on Aug 25, 2022

Germany set the best repayment for excess Solar and Wind with their Feed In Tariff. They paid a very high rate of about 5 times what they would charge you. All of German added Solar and Wind and stopped their use of power so they could sell back at a premium.  

   In FACT the Net-Metering should work similar to that in the entire world. In the US FERC a Federal agency was supposed to set Net-Metering. They only stated you get paid back but did not set the rates or method. It should have been set to what ever the utility charge you for clean renewable power during the Peak Time of day. They did not do that.  

Rafael Herzberg's picture
Thank Rafael for the Post!
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