The term 'WORD BEFORE POWER OR SYSTEM' can be solved by the word 'SOLAR', which is a five-letter word. SOLAR energy is a form of renewable energy that is derived from the sun's rays and is used to generate electricity or heat. SOLAR power is becoming increasingly popular as an alternative to traditional sources of energy, such as fossil fuels, due to its environmental benefits and cost savings. SOLAR systems are used to capture and store SOLAR energy for use in homes and businesses.