I'm at level 10 I hand windmill and solar. But under electricity there is no building called called..

There will be a Power Plant building option under Electricity. Possibly you will need to swipe to scroll to the right to find it. You unlock the first power plant building during the tutorial phases (around level 3) and more become available as you upgrade.

If it really isn't there then your game is broken. Try using the in game support option to contact the developers