Natural gas is a fossil fuel, while solar, wind, and hydropower are renewable energy sources.

Energy efficiency measures aim to reduce the amount of energy required to perform a specific task or achieve a desired outcome.

CFL bulbs consume significantly less energy than incandescent bulbs while providing similar or better lighting.

Energy transformation involves changing the form of energy, such as converting electrical energy into mechanical energy or thermal energy into electrical energy.

Electricity is a secondary energy source derived from primary energy sources like coal, natural gas, nuclear, and renewable resources.

Renewable energy generation refers to the process of producing electricity from renewable sources such as solar, wind, hydro, and geothermal.

Fossil fuel storage is not a form of energy storage technology; it involves storing fossil fuels like coal, oil, and natural gas for future use.

Energy investment refers to the allocation of financial resources to support the development and expansion of energy infrastructure and technologies.

Political stability is not directly related to energy investment decisions; it may influence investment decisions in general, but it is not a specific factor in energy investment.

Energy project appraisal involves evaluating the economic feasibility and potential benefits of an energy investment project.

Technological risk is not a type of energy investment risk; it is more commonly associated with the development and implementation of new technologies.

Energy project financing involves securing financial resources from investors to support the development and implementation of energy projects.

Mutual funds are not typically used for energy investment; they are more commonly associated with diversified investment portfolios.

Energy project management involves planning, organizing, and controlling the resources and activities required to successfully implement energy investment projects.

Technological innovation is not a direct measure of the success of an energy investment project; it may be a factor in the project's design or implementation, but it is not a primary evaluation criterion.