Firm capacity refers to accredited capacity that can be delivered with firm transmission service to a specific load area or load pocket. It is generally considered the premium capacity product because it combines dependable supply with transmission certainty, making it suitable for meeting load obligation requirements and supporting reliability planning.
In practice, firm capacity matters because not all accredited capacity carries the same level of reliability value. A resource may be accredited and broadly deliverable to the system, but if it is not backed by firm transmission rights to the relevant load location, it may not satisfy the same procurement or compliance needs. This is why firm capacity is often valued differently from more general capacity products.
Firm capacity is distinct from deliverable capacity. Deliverable capacity refers to accredited capacity that can be delivered across the broader balancing authority footprint under peak conditions. It is sometimes viewed as a baseline or system-wide product. Firm capacity goes a step further by pairing accredited capacity with firm transmission service to a specific load pocket, which makes it more directly usable for load-serving entities that must meet defined load obligations.
This distinction becomes especially important in markets shaped by accreditation reform, planning reserve margins, seasonal reliability requirements, and transmission constraints. As capacity markets evolve, understanding whether a product is firm or only deliverable can affect procurement strategy, valuation assumptions, and risk exposure. Noreva tracks these market structures through its capacity market intelligence and merchant curve coverage, helping market participants analyze how capacity products fit into forward planning and market decision-making.