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Incorrect cash flow values with energy production

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Good afternoon. 


I need your help. I have a project where the income forecast indicates that I have an energy production of 61,733 kWh/year, self-consumption of 29,042 kWh/year, and an energy injection of 32,691 kWh/year. So far, so good.
Further down in the financial analysis, however, it shows an injection into the grid of 32,517 kWh/year. Why is that? 
Then I have another question: with self-consumption at 0.10€/kWh, I should have energy savings of 2904.2€ (29042*0.10) and an injection tariff of 1307.64€ (32691*0.04) but that's not what the cash flow is showing me, it's showing less, it seems to be considering some additional losses/degradation to calculate the energy value. Can you help? 

Thank you

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Dear Patrick Pereira,

Thank you for your inquiry.

The grid export is 32,691 kWh/Year without taking module degradation into account or 32,517 kWh/Year with module degradation into account.

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For the same reason, your savings are also lower (€2,887 in the first year). Without taking module degradation into account, you would get €2,904 in the first year.

  • Author
Em 08/09/2025 às 13:14, Patrick Pereira disse:

Boa tarde. 


Preciso da sua ajuda. Tenho um projeto em que a previsão de receitas indica uma produção de energia de 61.733 kWh/ano, um autoconsumo de 29.042 kWh/ano e uma injeção de energia de 32.691 kWh/ano. Até aqui, tudo bem.
Mais abaixo, na análise financeira, no entanto, é apresentada uma injeção na rede de 32.517 kWh/ano. Porquê? 
Depois, tenho outra questão: com um autoconsumo de 0,10€/kWh, deveria ter uma poupança de energia de 2904,2€ (29042*0,10) e uma tarifa de injeção de 1307,64€ (32691*0,04), mas não é isso que o fluxo de caixa me mostra, está a mostrar menos, parece estar a considerar algumas perdas/degradação adicionais para calcular o valor energético. Podem ajudar? 

Obrigado

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Mas se eu estou a considerar uma venda de energia a 0,04€kWh pelos 32517kWh que a central vai injetar, não deveria ter uma receita de 1300,68€ no primeiro ano?? no fluxo de caixa está a dar 1312,40€ .
Obrigado pela ajuda.

Dear Patrick Pereira,

Thank you for sending us the project file.

You have taken into account an inflation rate of 2 % for the feed-in tariff and your commissioning date is 8 July 2025. As the commissioning date is not 1 January, the price change factor is already taken into account during the first year of operation. Therefore, the cash flow table shows income of 1,312.40 € instead of 1,300.68 €.

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