<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  How efficient is solar energy at converting sunlight into electricity? Context: Solar energy has an efficiency of around 20% at converting sunlight into electricity. Answer: [/INST]Solar energy is around 20% efficient at converting sunlight into electricity.</s>