Hi Makki. Are you asking "what do we think about Solar Power Generation (or other renewable energy)?
The brief context clarified on this issue which I recently read and learned is as follows: (It is too looooong ..., but please allow me to write this.)
First of all, existing nine (9) electric power companies in Japan are given the right in their region to sell electricity exclusively under the "Electricity Business Act (電気事業法）", provided they are required to supply high quality of electricity, i.e., maintaining a constant voltage when supplying it to the general enterprises and individuals. While the Act sets a very high bar for the quality of electricity, the newcomers such as IPP [= Independent Power Producer] and individual power suppliers are compelled to ask either of these nine companies for using their grids when selling electricity they generated.
Also "Special Measures Law on Renewable Energy (再生エネルギー特措法)" established recently is: (1) to require nine companies to purchase electricity, for a certain period of time and at the fixed price, to be provided by the newcomers [= power suppliers] who have obtained it by the renewable energies such as solar, wind and so on, (2) to urge the newcomers on investments by eliminating the risk of collection of their investments, and (3) to admit nine companies for claiming surcharge to the users of industries and general households for allocating it [the cost] for these purchasing expenses.
As you mentioned, Makki, output of solar power generation differs depending on the weather conditions, and output and quality of electricity provided by the newcomers are quite unstable and poor. That is why solar power generation business wouldn't spread all over in the past. Therefore, the Special Measures Law, to be enacted this coming July, will require the nine companies to purchase electricity at the fixed price so that the government will lead in commercializing solar power generaiton in one sitting.
A. The Fixed Price: Undetermined. (abt. 42yen/kw)
B. Electricity Cost:
1. Power Plant & LNG: 7～8yen/kw
2. Hydraulic: 8～13yen/kw
3. Wind: 10～14yen/kw
4. Solar: 49yen/kw
5. Nuclear: 5～6yen/kw → 13yen/kw (including extraordinary expenses for damages of recent nuclear accident. 20 trillion yen over a decade.)
Size of Introduction of Solar Energy in Germany: Accumulated amount of investment is 12 trillion yen and the capacity of power generation is only 0.25% [one four-hundredth] for the total power consumption of the country.
【Adapted from News Week】
From above, if the fixed price will be set higher, it will take a great deal of strain to the power companies and eventually, it will raise the electricity cost and impact the consumer's pocket. On the other hand, if the fixed price will be set lower, a balance of business will become deficit and the local governments, invested to the business, have to compensate for the losses. Resulting, it will boomerang on the consumers and be the burden for them under the name of tax. It's a lose-lose situation for the public at large.
So, under the present framework of these laws, this surcharge will be tacked on a fee for power charges which, we, consumers have to bear. What do you think about this, Makki?