NEMO is a chronological production cost model for testing and optimising different portfolios of renewable and fossil electricity generation technologies. NEMO has models for the following generator types: wind (including offshore), photovoltaics, concentrating solar power (CSP), hydropower, pumped storage hydro, biomass, black coal, open cycle gas turbines (OCGTs), combined cycle gas turbines (CCGTs), diesel generators, coal with carbon capture and storage (CCS), CCGT with CCS, geothermal, demand response, batteries, electrolysers, and hydrogen fuelled gas turbines.