The energy consumption of a standalone freezer depends on several factors, including its size, age, efficiency rating, and usage patterns. On average, a modern standalone freezer consumes between 100 to 800 kilowatt-hours (kWh) per year. 
1. **Size**: Smaller freezers, such as compact or chest models, typically use less energy, ranging from 100 to 400 kWh annually. Larger upright freezers can consume between 300 to 800 kWh per year.
2. **Efficiency**: Energy-efficient models, often labeled with the ENERGY STAR certification, use less electricity. These models can be up to 10-15% more efficient than non-certified models.
3. **Age**: Older freezers tend to be less efficient due to outdated technology and wear and tear. A freezer over 10 years old may consume significantly more energy compared to a newer model.
4. **Usage**: The frequency of opening the freezer, the ambient temperature of the room, and how full the freezer is can impact energy consumption. A freezer in a hot garage will use more energy than one in a cool basement. Keeping the freezer full helps maintain temperature and reduces energy use.
5. **Temperature Settings**: Setting the freezer to a lower temperature than necessary can increase energy consumption. The recommended setting is around 0°F (-18°C).
To calculate the cost of running a freezer, multiply the annual kWh usage by the local electricity rate. For example, if a freezer uses 400 kWh per year and the electricity rate is $0.12 per kWh, the annual cost would be $48. 
In summary, while the energy consumption of a standalone freezer varies, selecting an appropriately sized, energy-efficient model and maintaining optimal usage conditions can minimize energy use.