SSPLAXBuilding Decarbonization
Which mix meets the emissions target at the lowest cost once the cheap retrofits hit their installation limits?
Least-cost compliant mix
Eff 1,500 · HP 2,500 · Solar 600 · Gas 931 · Green 469 MWh
Minimum cost to target
~$356k/year
What binds
Retrofit caps + carbon target (not budget)
Composition
Least-cost portfolio
What sets the blend
Efficiency, heat pumps, and solar all reach their installation limits. The carbon target limits gas to 931 MWh and requires 469 MWh of green power.
Situation
The portfolio must serve 6,000 MWh and meet its carbon target. Efficiency, heat pumps, and solar each have installation limits.
Model logic
Chooses the lowest-cost supply and retrofit mix that meets demand and the emissions cap.
Efficiency, heat pumps, and solar all reach their installation limits.
The carbon target limits gas to 931 MWh and requires 469 MWh of green power.
Budget still has headroom; retrofit capacity and carbon set the plan.
Use the least-cost compliant mix: 1,500 MWh efficiency, 2,500 heat pumps, 600 solar, 931 gas, and 469 green power.