Is it near night time? A solar boiler will only generate electricity during the daylight hours. The red bar on your Consumes electricity -> Electricity seems to indicate either late evening or early morning. To even out your power, you can store the steam and generate electricity from that with steam engines.
Besides that, your solar boiler will prioritize steam generation until it fills your steam system. You'll only get about 1 kw/s of electricity from it prior to that point. Furthermore, if it is carelessly connected to your electrical grid, it will consume electricity to boil with during times when sunlight is less than 100% and your steam system isn't filled.
To keep my solar boilers from browning out my electrical system (they add 1.8 mw of demand for brownout calculations), I buffer them with an accumulator/power switch combination that only connects to the main grid when an attached accumulator within the firewall is at 100%. That way, they can provide surplus solar power to the grid when they aren't generating steam.
https://www.dropbox.com/s/z8wnqjucyplx6x3/Untitled.png?dl=0