Resource Adequacy and Reliability

Ensuring system reliability as loads grow and the resource mix changes.

E3 measures resource adequacy and designs the standards that hold the system to it. We run probabilistic loss-of-load modeling, set planning reserve margins, and calculate the effective load carrying capability (ELCC) of renewables, storage, demand response, and thermal resources, the values that determine how much each contributes to reliability. We do this for utilities planning their portfolios, for regulators assessing whether supply will meet demand, and for the system operators that accredit resources and run capacity markets.

As the resource mix shifts toward variable and energy-limited resources, the conditions that drive reliability risk are changing, and a resource’s contribution depends on what else is on the system. We simulate thousands of weather and load years to find the periods when loss of load is most likely and to value loads and resources by what they contribute during those hours. That analysis supports two kinds of decisions: in planning, it sets the reliability standards and reserve margins that portfolios are built to, and in markets, it shapes how resources are accredited and compensated.

How we support

Resource adequacy and reliability

Resource adequacy studies

Probabilistic loss-of-load modeling across many weather, load, and hydro conditions to quantify reliability needs, identify shortfalls, and characterize when and why a system is at risk.

Capacity accreditation and ELCC

Effective load carrying capability values for renewables, storage, hybrid resources, demand response, and thermal generation, including how those values change as the portfolio grows.

Planning reserve margins and reliability standards

Reserve margin and reliability targets, and the translation of those standards into planning and procurement requirements.

Capacity market and accreditation design

Market rules and accreditation methods that value resources by their contribution during the system's critical periods.

Who we work with

Across resource adequacy and reliability

Utilities

Resource adequacy assessments, ELCC studies, and reserve margin analysis that feed integrated resource and system plans.

Regulators and legislatures

Independent assessments of whether projected supply will meet demand, including statewide studies that identify shortfall risk and the options to address it.