NTT東日本株式會社宮城事業部（執行役員宮城事業部長：須藤 博史，以下稱NTT東日本）將與NTT Anode Energy株式會社（總公司：東京都港區，代表取締役社長 岸本 照之，以下稱「NTT Anode Energy」）合作，在其位於仙台市若林區的自有辦公大樓「五橋大樓」導入離岸型企業購電協議（以下稱「離岸型PPA」），以長期採購再生能源。
透過此措施，自2026年4月起，五橋大樓將開始使用再生能源（以下稱「再能」）所產生的電力※1。此外，每年約有200萬※2度電將為再能發電，預計可減少約800噸※3的溫室氣體排放量。若換算為一般家庭的年電力使用量※4，相當於約500戶家庭的溫室氣體減量。
NTT東日本將透過在作為宮城事業部核心的五橋大樓導入再能，來推動地區的碳中和措施。
NTT東日本為減少CO2排放所做的努力
NTT東日本集團基於NTT集團新的環境能源願景「NTT Green Innovation toward 2040」，正朝著實現2040年碳中和的目標邁進。在導入再能方面，繼2024年在群馬地區導入水力發電的電力※5後，此次將在宮城地區新導入具有附加性※6的太陽能發電電力。透過使用同一縣內發電的電力，也有助於能源的在地生產與在地消費。
NTT Anode Energy致力於開發與提供先進的再能，並努力滿足社會及用戶的需求，為實現日本2050年碳中和目標做出貢獻。
關於本離岸型PPA
企業購電協議（Power Purchase Agreement：PPA）※7，是指用戶透過電力零售商與發電業者簽訂長期購買再能發電的合約。離岸型PPA是一種從遠端發電設備透過輸配電網將電力傳輸給用戶（本案為五橋大樓）的模式。在此離岸型PPA中，NTT Anode Energy透過整合設置於宮城縣內的數個太陽能發電廠的電力，以滿足所需容量，實現了宮城縣內再能發電的在地生產與在地消費。
＜離岸型PPA 系統圖※7＞
五橋大樓概要
※1 本電力供應由NTT Anode Energy集團旗下的Ennet株式會社（電力零售商登記號碼：A0009）負責，並由NTT Anode Energy
常見問題
What is an off-site PPA?
An off-site PPA (Power Purchase Agreement) is a contract where a customer purchases renewable energy-derived electricity from a power producer located remotely, with the electricity transmitted via the transmission and distribution network. This differs from an on-site PPA where the generation facility is located at or near the customer's premises.
What are the expected environmental benefits of this initiative?
This initiative is expected to result in approximately 2 million kWh of renewable energy-derived electricity annually, leading to a reduction of about 800 tons of greenhouse gas emissions. This is equivalent to the greenhouse gas reduction of approximately 500 households.
When will the Gokei Building start using renewable energy?
The Gokei Building will begin using electricity derived from renewable energy starting from April 2026.
What is NTT's overall environmental goal?
NTT East Group is working towards achieving carbon neutrality by 2040, based on the NTT Group's environmental and energy vision, "NTT Green Innovation toward 2040."
What is the significance of "local production and local consumption" in this context?
In this off-site PPA, NTT Anode Energy aggregates electricity from multiple solar power plants installed within Miyagi Prefecture. By supplying this locally generated renewable energy to the Gokei Building in Miyagi, it contributes to the local production and consumption of energy within the prefecture.
