Self-consumption

To start an Autoconsumption process, the customer must first register on the DGEG portal. Once the registration is guaranteed, E-REDES will proceed to the viability analysis of the power to be injected into the grid. If the conditions match those requested, DGEG will grant the registration. If the conditions differ from those requested, acceptance by the customer will be required for the registration to be granted.  

Subsequently, E-REDES proceeds with the creation of the Production CPE as well as the analysis of the meter count and substitution or repair of the meter if necessary. Once the registration phase is concluded, the Autoconsumer will have to obtain the certification of the installation from the DGEG. E-REDES will subsequently receive a communication from DGEG, and the Self-consumer's installation will be in operating condition, and the reading of data inherent to the activity of the meter(s) will begin.

If the meter is not suitable for Self-Consumption, E-REDES will replace it at no cost to the Customer. The appropriateness of the meter only occurs after the Customer registers the self-consumption in the DGEG Portal. 

If the installed power of the production unit for self-consumption (UPAC) is greater than 4kW, a totalizer meter must be installed to measure the injection of the UPAC at the usage installation. The charges associated with the modem and the GSM telecommunications card are the responsibility of the self-consumer.

In accordance with the legislation in force: 

• The UPAC with installed power equal to or less than 700 W is exempt from prior control, provided that the injection of surplus into the RESP is not foreseen; 
• UPACs with an installed capacity of more than 700 W and less than or equal to 30 kW are subject to prior notification; 
• A UPAC with installed capacity greater than 30 kW and equal to or less than 1 MW is subject to prior registration and operating certificate; 
• A UPAC with installed capacity greater than 1 MW is subject to the granting of a production and operating license. 

Yes, it is possible to change these types of production installation to Self-Consumption. You must go to the DGEG and request the cancellation of your Miniproduction/Microproduction/UPP production installation (DL153/2014), and then make a self-consumption registration on the DGEG Portal. Naturally, it will be necessary to reconvert your existing installation into an Autoconsumption one.

Pode fazer este pedido ao seu Comercializador. No entanto, deve ter em consideração dois pontos:

• o objetivo da UPAC é produzir, no máximo, a energia que necessita consumir, sendo aconselhável que a mesma tenha uma potência de instalação semelhante à potência contratada;
• o ICP (Interruptor de Controlo de Potência) no  contador está programado para desativar a passagem de corrente quando deteta um valor acima do contratado. Poderão surgir ocasiões onde a sua necessidade de consumo é baixa e a produção alta, resultando num valor de energia injetada superior ao limite estabelecido no contador, o que fará a sua ligação disparar.

Num regime de autoconsumo, o consumo não é calculado através das leituras diárias fornecidas pelo contador ou das leituras comunicadas pelo Cliente, mas sim com base num saldo quarto-horário entre a energia consumida pela rede e a energia produzida pelo Cliente, com base no regulamento do autoconsumo de energia elétrica.

The fourth hour balance is the difference between the consumption data in kW and the data injected into the grid in kW, in each 15 minute period. This means that everything that is produced in that 15 minute interval must be consumed in that same interval. What is not consumed is injected into the grid and another 15 minute cycle is started.

Self-consumers may register and access the Digital Counter, in the Consumption section, to consult the four curves of the load diagram (quarter-hourly), such as the consumption and injection value recorded by the meter. 

The data sent each month to the Supplier are presented in the Readings section of the Digital Counter, in which a distinction is made between the meter reading and the final balance that is considered by the Supplier.  

Due to the volume of information received daily from the meter, the remote collection of the load diagram may have some delay, so there may be a need for recalculation over time, depending on the receipt of more and better information. 

Only after the calculation of the reading for the 21st of each month, and the consequent emission of the balance readings for billing purposes by the supplier in the following days, does E-REDES guarantee that the best possible information is fully reflected in the calculated reading. Therefore, only at that moment do we provide the Customer with information regarding the balance readings of the previous month. 

Caso tenha uma instalação de Microprodução, Miniprodução, Unidade de Pequena Produção (UPP) ou uma Unidade de Produção de Autoconsumo (UPAC) com potência instalada superior a 4kW, ao fazer a substituição do cartão GSM do contador totalizador pode pedir um teste de comunicações ao mesmo através da área Contacte-nos, selecionando “Autoconsumo e Mobilidade Elétrica” e “Outros”. 

Pode solicitar essa informação através da área Contacte-nos, selecionando “Autoconsumo e Mobilidade Elétrica” e “Quero saber o estado do meu pedido de autoconsumo”. 

The production installation must be equipped with protections, at interconnection level, that ensure fast, effective and automatic separation from the electricity distribution networks, as well as providing the function of homopolar maximum voltage protection. Therefore, for Self-Consumption installations with a connection power exceeding 250 kW, the installation of the interconnection/homopolar protection for grid connection purposes is not exempt.