Emissions limit (single year)

This constraint caps total greenhouse gas emissions for a single investment period. It's useful when you need to enforce a specific emissions target or explore the cost-optimal system configuration under a fixed carbon budget.

Common use cases:

• Testing compliance with annual emissions caps or carbon budgets
• Exploring how system composition changes under different emission limits
• Sensitivity analysis to understand cost-emissions trade-offs

Note that in the code block below, n refers to the network object.

# "n" refers to the network
# Add a global constraint to limit CO2 emissions
n.add(
    "GlobalConstraint",
    "co2_limit",
    type="primary_energy",
    carrier_attribute="co2_emissions",
    sense="<=",
    constant=1e6  # 1 million tons CO2 limit
)

# add print statement for your logs
print("Added CO2 emissions limit constraint")