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Yes, it's worth converting a wood fireplace to gas. One of the main benefits of converting a wood fireplace to gas is convenience. Gas fireplaces don't need cleaning out, and you can turn them on with the press of a button. Safety is another advantage. If the gas fireplace is installed correctly, they have a safety shutoff valve that prevents leaks. They're also more energy efficient.

You don't technically need a chimney for a gas fireplace. However, if you go with the safer vented option, you need a direct vent or another venting system that draws in external air for combustion and expels the exhaust. If you have an existing chimney, you can use this as the vent as long as it's appropriately lined. Installing a chimney liner costs around $630 to $7,000. 

Yes, a gas fireplace will still work during a power outage. Gas fireplaces with a vertical pilot don't require electricity for the pilot flame to start. New gas fireplace models may use an intermittent pilot ignition system. These types of fireplaces generally need a power supply to light, but most have a backup system in case of a power outage.