Yonden Avoids Output Control of Solar Plants During Holidays in May

With pumped storage, inter-regional power lines

2019/05/14 20:11
Kenji Kaneko, Nikkei BP Intelligence Group, CleanTech Labo & Sousuke Kudou, technical writer
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In the service area of Shikoku Electric Power Co Inc (Yonden), the maximum output of solar power plants from 12:00 to 13:00 on May 5, 2019 (during the Golden Week holidays) was 1,870,000kW, and the ratio of solar electricity to power demand reached up to 88%. Yonden announced this May 8, 2019.

The area's demand during the one-hour period was 2,130,000kW. Yonden maintained supply-demand balance by (1) reducing the amount of power generated by thermal power plants (by about 500,000kW), (2) operating pumped storage power plants (reduction of about 590,000kW) and (3) using inter-regional power transmission lines (reduction of about 1,310,000kW). And it realized stable supply of electricity without carrying out the output restriction (output control) of solar power plants.

Also, Yonden does not expect that the output control of renewable energy-based power plants will be conducted on May 11 and 12, 2019 (the first weekend after the holidays).

In the Shikoku and southern Awaji Island areas, as of the end of February 2019, 2,460,000kW of solar power plants had already been connected to power grids, and 870,000kW of solar projects had applied for contracts, totaling 3,330,000kW.

The "output control limit of 30 days, etc" set for Yonden's service area is 2,570,000kW. The amount of applications for contracts exceeded the limit as of January 22, 2016. Application submitted after reaching the limit are received under the "designated power producer system," and limitless, uncompensated output control for more than 360 hours per year is the condition for grid connection.

In the service area of Yonden, the output control of renewable energy-based power plants is around the corner. Even if output control is not carried out during the daytime low-load period in the spring of 2019, output control orders will highly likely to be issued during the low-load period in the fall of 2019, when solar power generation facilities will be further introduced. PV inverter manufacturers, etc are making efforts to support the real-time control of systems and so forth (TMEIC's Products Support Output Control Orders of Multiple Power Companies).