Christmas lights and power consumption
An average town of 300 000 - 400k people needs an extra 1 to 1,5MWh during Christmas to keep the lighting working. Of this power, 2/3 is due to domestic lighting alone. To bring these numbers into scale, a conventional coal power plant assures 50-100MW of energy, whilst a single nuclear reactor provides 0.6-1GWh. During Diwali this figure would be certainly bigger.
In order to estimate this figure the following assumptions were made: 5W decorating incandescent bulbs, 1W LEDs, blinked 1/8W LED strips& optic fibre, coventional 25W christmas tree lights. 90k inhabitable homes, of which 75% would be in occupancy at the time. 2 main roads stretching a total of 50km and additional 15 important streets that are decorated by the city council.