Why is solar street lighting getting more popular

https://www.sbmsolartech.com/product/a1-economic.html
Have you ever stopped to think about the electricity bill our government pays each month for street lights? It's crazy how much they pay! Have you wondered why windmills have fans that rotate in rural areas and what impact it has on us? There are so many problems we're faced with, like pollution, CO2 emission, global warming. If we have cared to ponder and take some action about it - I am sure you will have a hunch as to why solar street lighting is becoming more popular these days.