美国和加拿大的可持续能源工业系统：展示太阳能到多用途能源的价值

The transition to highly sustainable energy industry systems is being driven by significant growth in solar photovoltaics (PV). Despite targets to reach net-zero emissions by 2050, fossil fuels still dominate the energy industry systems in the USA and Canada. Transition pathways are developed and analyzed comparing a complete defossilization of both energy and nonenergy demands with business-as-usual conditions based on government projections. The results demonstrate the benefits of transitioning to 100% renewable energy for all sectors, as excess low-cost electricity from solar PV can be used for power-to-X solutions to produce electricity-based fuels, chemicals, and materials. By 2050, the power sector will only consume 20% of generated electricity, with the remaining used to electrify the heat, transport, and industry sectors. Thus, 86% of all primary energy in the system comes from renewable electricity, as total electricity generation increases from 4394 TWh in 2020 to 20 795 TWh in 2050. Solar PV reaches 78% of all electricity generation, leading to 10.6 TW of installed capacity. The full energy industry sector transition leads to reductions in both levelized cost of electricity (LCOE) and levelized cost of final energy (LCOFE). The LCOE sees massive reductions from 72 €/MWh in 2020 to 25 €/MWh in 2050, and the LCOFE decreases from the current 50 to 41 €/MWh in 2050. The strong operational synergies between solar PV and flexible electrolysis enable a transition pathway that demonstrates the viability of a Power-to-X Economy in achieving climate targets of net-zero emissions. The high share of solar PV indicates a Solar-to-X Economy characteristic.