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Waterjets are generally considered to be energy-efficient compared to other cutting methods. Here's how the energy efficiency of waterjets compares to other common cutting tools:

1. Laser cutting: Laser cutting is an energy-efficient cutting method when compared to traditional cutting methods like sawing or milling. However, laser cutting can still use a significant amount of energy, especially for high-powered lasers.

2. Plasma cutting: Plasma cutting is a relatively energy-efficient cutting method, especially when compared to oxy-fuel cutting. However, plasma cutters still require a significant amount of energy to operate.

3. Sawing: Sawing is generally considered to be energy-intensive, as it requires significant power to operate the saw blade and move the material being cut.

4. Punching: Punching is a relatively energy-efficient cutting method for sheet metal, as it does not require the use of heat. However, punching machines still require energy to operate, especially for high-volume cutting applications.

5. Waterjet cutting: Waterjet cutting is generally considered to be energy-efficient, as it uses only the energy required to generate the high-pressure water stream. Unlike other cutting methods, waterjet cutting does not require the use of heat or chemicals, which can further reduce energy use.

Overall, waterjet cutting is one of the most energy-efficient cutting methods available, especially when compared to traditional cutting methods like sawing or milling. While laser and plasma cutting can also be energy-efficient, they still require significant energy to operate, especially for high-poweredlasers or plasma cutters. Punching is also relatively energy-efficient for sheet metal, but waterjet cutting is still considered to be a more environmentally friendly option due to its lack of heat and chemicals.