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'Consigned-transmission System' Developed for Remote Self-consumption of Solar Electricity

2020/03/19 17:02
Sousuke Kudou, technical writer
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Eco Style Co Ltd (Osaka City) announced March 13, 2020, that it will provide the "self-consumption" model of solar electricity using the "self-consigned-transmission system" for high-voltage utility customers who cannot install solar power generation (PV) systems on the premises of their power-consuming sites.

Currently, the company is making adjustments on the first project to apply the model.

The self-consigned-transmission system is a service for transmitting electricity generated by high-voltage utility customers who own power generation facilities to their own manufacturing plants, etc located in other regions. It uses the power transmission/distribution networks of general electric power suppliers while keeping supply-demand balance.

Though those high-voltage utility customers have to pay for consigned transmission, it is considered as self-consumption, eliminating the need to pay the impost of the feed-in tariff scheme and potentially making it possible to cut electricity bill.

Self-consigned transmission that uses only naturally-fluctuating power sources such as solar power is required to match the actual amount of power generated in every 30 minutes with the power generation plan and has been considered to be difficult in general. But some companies including Sony Corp recently announced that they would engage in self-consigned transmission.

This time, Eco Style made it possible to provide the new self-consumption model for solar electricity by using its own power generation prediction technology. It will support (1) the development of solar power plants (including land) across Japan, (2) signing of various contracts for self-consigned transmission, (3) negotiations with contracted retail electricity businesses and (4) making power generation plans for using solar electricity.

The self-consigned-transmission system is targeted at high-voltage utility customers. So, the new service requires a high-voltage contract.

The power generation prediction technology of Eco Style was developed by the company's weather forecaster. It predicts the amount of solar electricity generated with a high accuracy and enables to make a power generation plan. By using "FIT Imbalance Special Scheme 2," which requires elaborate prediction of power generation, the company has accumulated results, it said.

With FIT Imbalance Special Scheme 2, retail electricity businesses predict the amount of power generated by themselves and make power generation plans. To keep the imbalance low, it is necessary to increase the accuracy of the prediction of the amount of power generated in every 30 minutes. So, the number of businesses using the scheme is limited, and the amount of contracts accounts for only 1.1% of all the contracts of solar power generation (as of the end of October 2017).