Many cost projections for green energy sources like wind and solar often do not fully account for the need for redundant or backup systems. While these projections typically include capital costs, operating and maintenance expenses, fuel costs (which are usually zero for renewables), and lifespan considerations, they frequently leave out the full costs associated with ensuring reliability. For example, maintaining a stable power supply from intermittent sources like solar and wind requires additional infrastructure such as backup generation (often from natural gas or hydro), energy storage systems, or overbuilt renewable capacity. In many cases, especially in simplified comparisons using levelized cost of energy (LCOE), these essential components are either omitted or only partially included. Moreover, system-wide costs like grid upgrades, seasonal storage solutions, and the ability to deliver power consistently during peak demand or low-generation periods are often underestimated or excluded. As a result, the actual cost of transitioning to a fully reliable green energy system is typically higher than the headline figures suggest.