Visit to Plant

Solar Power Generated in Nagasaki 'Consumed' at Facility in Ibaraki

RE100 company's strategy for using, extending renewable energy source in Nagasaki

2020/03/01 21:47
Kenji Kaneko, Nikkei BP Intelligence Group, CleanTech Labo
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2MW-output panels on side slope owned by city

The New Nagasaki Fishing Port in northwest Nagasaki City is a relatively new port opened about 30 years ago, and many seafood processing factories are located around the dock. A hill rises just behind the factory area, while a quiet housing estate spreads across the top of the hill stretching from the port.

As you look up the hill from the nearby site of one of the seafood processing factories, you can see solar panels neatly arrayed on a steep slope between the ridge lines covered by trees. This is the "Sakura-no-sato Mega Power Plant," a mega- (large-scale) solar power plant with an output of about 2MW. It began operation in October 2015, utilizing the south-facing side slope of a road constructed along with the housing estate (Fig. 1).

Fig. 1: Sakura-no-sato Mega Power Plant utilizes side slope. (source: Toda)

The power producer is "Sakura-no-sato Mega Power GK" (Nagasaki City), a special purpose company (SPC) formed by Toda Corp and TB Corporation of the Kyushu Gas Co Ltd (Isahaya City, Nagasaki Prefecture) Group. The project was selected through Nagasaki City's call for "proposals for a solar power generation project that utilizes the side slope of a road" (Fig. 2).

Fig. 2: Sakura-no-sato Mega Power Plant. Mitsubishi Electric solar panels, TMEIC PV inverters adopted (source: Nikkei BP)

Renewable energy source in Nagasaki used in Tsukuba City

On October 8, 2019, Toda started using power generated at the Sakura-no-sato Mega Power Plant operating in Nagasaki City for its Tsukuba Technology Research Institute in Tsukuba City, Ibaraki Prefecture (Fig. 3).

Fig. 3: Toda's Tsukuba R&D Center in Tsukuba City, Ibaraki Prefecture (source: Toda)

Toda is participating in "RE100," an international initiative advocating the goal of sourcing 100% electric power consumption from renewable energy. Towards the achievement of this target, the company is advocating the goals of converting its power consumption in business activities to renewable sources by 50% in 2040 and 100% in 2050.

Minna-denryoku Inc (Setagaya-ku, Tokyo) had supplied "100% renewable energy" to the Tsukuba R&D Center since July 2019. In October 2019, following a specific power supply agreement signed between Minna-denryoku and Sakura-no-sato Mega Power GK, the power supply service was switched to a form in which electricity generated at the mega-solar plant is sold wholesale to Minna-denryoku and consequently used at the R&D center through an electric power trading system based on blockchain technology.

The R&D center's annual power consumption totals about 1.1GWh, roughly 40% of which is expected to source solar power mainly at the Sakura-no-sato Mega Power Plant.