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大規模な太陽光発電のマイナス面 Negative aspects of large-scale solar power generation

大規模な太陽光発電が日本でもあちこちに見かけますが、マイナス面として

1.自然環境破壊、

2.送電ロス、

3.一般家庭への再エネ賦課金(再生可能エネルギー発電促進賦課金)

などがあります。

1)自然環境破壊は言うに及びません。

2)一か所で大量発電した場合、太陽光発電のメリットである地産地消にはならず、これまでの大規模発電送電方式と同じように電力線網を使って遠隔地に送電しなければなりませんので、大きな送電ロス(約5%~)が生じます。

3)既存の電力線網設備利用と再生エネルギー導入を図る、と身勝手な理由で政府と電力会社が全ての家庭に強いている負担金支払い額は3.98/kWhです。この負担金は月400kWhを使う標準家庭で、年間では約2万円にもなります。電気料金の約10%にもなり、大変、理不尽なことです。

以上の理由から、太陽光発電は各家庭では小規模(1KW以下)で、商用電源と接続しないで、地産地消方式で100%使い切るのが経済的です。

我が家では僅か0.6KW(600W) の発電、1.6KW(1,600W)の蓄電規模で必要量の40%近くを賄っています。(季節により異なりますが。)

更に、この方法であれば、SDGs、持続的エネルギーの地産地消が可能で、しかも理不尽な再エネ賦課金支払額を減らすことができます。

Negative aspects of large-scale solar power generation:

While large-scale solar power plants are now common sights across Japan, their drawbacks include:

1. Destruction of natural environments,

2. Transmission losses,

3. Renewable energy surcharges for all households (Renewable Energy Promotion Surcharge).

1) The destruction of natural environments goes without saying.

2) When generating large amounts of power in one location, it defeats the purpose of local production for local consumption, a key benefit of solar power. Instead, it must be transmitted to distant locations via the power grid, just like conventional large-scale generation, resulting in significant transmission losses (approximately 5% or more).

3) The government and power companies are forcing all households to pay a surcharge of 3.98 yen/kWh, citing the selfish reason of “utilizing existing power grid infrastructure and promoting renewable energy adoption.” For a standard household using 400 kWh per month, this fee amounts to approximately ¥20,000 annually. This represents about 10% of the electricity bill and is highly unreasonable.

For these reasons, it is economically efficient for households to use solar power generation on a small scale (1 kW or less), without connecting to the commercial grid, and consume 100% of the generated power locally.

At my home, a modest 0.6kW (600W) generation capacity and 1.6kW (1,600W) storage system cover nearly 40% of our needs (though this varies seasonally).

Furthermore, this approach enables SDGs-compliant, locally produced and consumed sustainable energy while also reducing the unreasonable renewable energy surcharge payments.