GT Advanced Technologies Inc fka GTAT

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The laws of thermodynamics will not allow you to ever get back what you put in. The recovered heat energy was used to preheat something at a lower temp so as to reduce the need for additional elec power to do that incremental heating. Without the source of electricity in the first place there would be no heat generated to recover. No matter how efficient the recovery was a backup was still required to keep the systems at temperature. The backup system could not maintain the required operating temps.

GT at the Salem NH plant made red sapphire that probably could pass as ruby. It was called Ti Sapphire..Ti for Titanium which was used as a dopant.
The application was for lasers. They were very careful not to cross use the systems for Ti SApphire and LED sapphire as the dopant levels were very low and any residual could taint the LED or optical grades.