FIGURE 3 EnergyPATHWAYS Economic Subsectors Figure 4 demonstrates the final energy calculations employed in EP using residential lighting as an example subsector. Overall service demand for lighting follows a Scenario growth trajectory. Meanwhile, different bulbs make up the overall lighting stock, and as those bulbs reach the end of their lifetime, they can be replaced with more efÏcient lightbulb technologies. Here, LEDs replace existing stocks of CFLs and incandescent, for example. SPP FUTURE LOAD SCENARIOS | EVOLVED ENERGY RESEARCH | 9