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From Wookiepedia:

The power of the first Death Star's superlaser was estimated to have been more than 2.4×10^32 watts, with an optimum range of 2,000,000 kilometers and a working range of 420,000,000 kilometers. Powerful enough to destroy a terrestrial planet, it was the most powerful energy weapon ever built at the time

And while the original source is not linked on Wookiepedia I believe this is from The Essential Guide to Weapons and Technology, it may also have been the Death Star Technical Companion.

From Wookieepedia:

The power of the first Death Star's superlaser was estimated to have been more than 2.4×10^32 watts, with an optimum range of 2,000,000 kilometers and a working range of 420,000,000 kilometers. Powerful enough to destroy a terrestrial planet, it was the most powerful energy weapon ever built at the time

And while the original source is not linked on Wookieepedia I believe this is from The Essential Guide to Weapons and Technology, it may also have been the Death Star Technical Companion.

From Wookiepedia:

The power of the first Death Star's superlaser was estimated to have been more than 2.4×10^32 watts, with an optimum range of 2,000,000 kilometers and a working range of 420,000,000 kilometers. Powerful enough to destroy a terrestrial planet, it was the most powerful energy weapon ever built at the time

And while the original source is not linked on Wookiepedia I believe this is from The Essential Guide to Weapons and Technology

From Wookiepedia:

The power of the first Death Star's superlaser was estimated to have been more than 2.4×10^32 watts, with an optimum range of 2,000,000 kilometers and a working range of 420,000,000 kilometers. Powerful enough to destroy a terrestrial planet, it was the most powerful energy weapon ever built at the time

And while the original source is not linked on Wookiepedia I believe this is from The Essential Guide to Weapons and Technology, it may also have been the Death Star Technical Companion.

From Wookiepedia:

The power of the first Death Star's superlaser was estimated to have been more than 2.4×1032 watts, with an optimum range of 2,000,000 kilometers and a working range of 420,000,000 kilometers. Powerful enough to destroy a terrestrial planet, it was the most powerful energy weapon ever built at the time

And while the original source is not linked on wookiepedia I believe this is from The Essential Guide to Weapons and Technology

From Wookiepedia:

The power of the first Death Star's superlaser was estimated to have been more than 2.4×10^32 watts, with an optimum range of 2,000,000 kilometers and a working range of 420,000,000 kilometers. Powerful enough to destroy a terrestrial planet, it was the most powerful energy weapon ever built at the time

And while the original source is not linked on Wookiepedia I believe this is from The Essential Guide to Weapons and Technology