Yes, which is why burning fossil fuels is bad, we're releasing energy that didn't radiate into space during a time where the environment was already much hotter

Yes, which is why burning fossil fuels is bad, we're releasing energy that didn't radiate into space during a time where the environment was already much hotter... and even at an extreme point coating the earth in solar panels would affect our albedo enough to increase the temperature, regardless if we use the energy they create. Heat is actually the limiting factor for our growth on this planet. We can grow food off planet, we can't really increase our heat radiation rate.