| Chapter | Topic | Most Sought-After Problem Type | |---------|----------------------------|----------------------------------| | 2 | Solar Radiation | Clear-sky insolation on a tilted surface (Liu & Jordan model) | | 3 | PV Fundamentals | Effect of series/parallel mismatch on I-V curve | | 4 | Battery Storage | Peukert’s exponent and round-trip efficiency | | 5 | PV System Design | Combining NEC derating factors (125% rule) | | 6 | Wind Power | Betz limit + actual turbine CP (power coefficient) | | 7 | Economics | LCOE comparison with and without tax credits | | 8 | Efficiency | Illuminance calculations for LED retrofits |

Renewable energy sources are a crucial component of a low-carbon electric power system. The cost of renewable energy technologies, such as solar and wind power, has decreased dramatically in recent years, making them more competitive with fossil fuels. Some of the most promising renewable energy sources include: