Is there any way to programmatically turn a HDMI TV on/off on windows?
Either using an application or script/programming interface.
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First check if your graphics card (hardware) supports HDMI CEC. Then also the drivers must support it. But according to this review, very few cards have CEC support.
For PCs without CEC support, there exists various products which add CEC support. They connect between the PC and TV on HDMI cable plus via USB to PC. The software sends CEC commands to adapter via USB. One example of such product is: USB HDMI CEC adapter from Pulse-eight.