I'll keep this updated throughout the day.
Electricity usage at Tokyo Dome topped out at 2,767 kW today. That's about 40% less than the 4,600 kW hours used during peak times in May last year. Yesterday's game came in at 2,970 kW (about a 35% reduction).
The Swallows confirmed evening viewing conditions at Jingu Stadium today with the lights turned down about 22%. The team is hoping for at least a 20% reduction in energy use during night games. The Swallows' first night game of the season will take place on the 22nd (vs Softbank).