You intentionally ignored the part about being overcast for weeks during the winter, the time of the year where they need the most energy. Tell me how solar can heat up the entire country when it’s overcast and there are only 8 hours of day light, which reminder, is covered by the overcast weather that stays for weeks

Middle of January: 100% overcast for weeks on end with only 8 hours of daylight, some days with little to no wind.

I think you are forgetting on part of the message.

Sure on average over the year you can produce enough electricity, but how do you heat houses in december, January and February when there is almost no sun ?