Basic knowledge about energy field

1. ppa: power purchase agreement
2. Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat.^[3] Renewable energy often provides energy in four important areas: electricity generation, air and water heating/cooling, transportation, and rural (off-grid) energy services.^[4]
3. scenario, reference scenario; 参考方案。
4. levelized cost of energy LCOE，均衡的能源消耗。
5. factors affect future scenarios: fuel prices, policies, technologies.  
6. All models are clear simplifications and approximations of reality. Model results come with uncertainty. Thus, always state your model results with confidence intervals, sensitivity analysis.