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Warning: Trying to access array offset on value of type bool in /home/kkwave/patsukin.com/public_html/wp-content/themes/simplicity2/header-twitter-card.php on line 45 ソーラーパネル設置費用が謎の大暴落、太陽光発電が国内最安の電源に、供給価格が4円/kWh台まで低下