EnCompass has the most complete set of functions for modeling complex environmental programs, such as stringent carbon limits and overlapping renewable portfolio standards.
Emission Allowances & Renewable Energy
Resources can be part of any number of programs, which may be annual or seasonal mass-based emission allowance programs, rate-based emission programs with subcategories and generation-shifting incentives for natural gas combined cycle units, or generation-based renewable energy credits. Rate-based emission programs may also include designated renewable and energy efficiency resources, which will produce emission rate credits that can be sold to fossil fuel generators.
Price forecasts for these allowances and credits may be directly input into EnCompass, or annual program limits can be enforced which will also produce allowance or credit prices. Each program has the option to include a bank, which allows for over-compliance in early years to offset tighter limits in later years. A penalty price for exceeding annual limits acts as a reliability safety valve, so that allowances or credits can be borrowed from future years under extreme conditions.
Power to Gas (Hydrogen Storage)
The carbon-free production, storage, and combustion of hydrogen is one of the most promising technologies to use excess renewable energy to reliably meet peak load requirements whenever they occur. EnCompass 5.0 includes fuel inventory logic that allows for resources like electrolysis to convert power into hydrogen gas based on an input kWh/kg rate. That hydrogen can then be stored and used in properly equipped combustion turbines in simple or combined cycle configurations.
For long term runs that can include capacity expansion (with electrolysis as an available option), EnCompass will determine the best times to produce and consume hydrogen, and the monthly levels of storage subject to maximum and minimum constraints. The monthly storage strategy will then automatically be used in detailed simulations which track and optimize hydrogen storage on a daily basis.
Dynamic Renewable and Limited Storage Firm Capacity
The effective load carrying capability (ELCC) of intermittent resources (e.g., wind and solar) and limited energy storage (e.g., lithium-ion batteries) tends to decline as more capacity is added, and in some cases will reach 0 once a tipping point is reached. The 5.0 release of EnCompass allows for multiple incremental ELCC curves to be defined for any group of resources. The capacity expansion logic in EnCompass will use these curves as part of the economic decision for selecting a resource plan. The average realized ELCC is then applied to all resources within the group for the purposes of reserve margin contribution and capacity valuation.
By combining the program limits with capital project optimization, EnCompass determines the best combination of new unit additions, retrofits, and retirements to meet a complex array of environmental regulations.
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