4b) Suggest 2 reasons why some areas of the world are unlikely to depend entirely on renewable energy sources. 

1. In LEDCs, they are constrained by their economical an political uncertainty. The may not have the right resources or capital to fully fund a renewable energy source such us solar power. In page 91 of the course companion, one of the disadvantages of solar power is its high cost. The high costs of solar power make it difficult for the industry to achieve its full potential. as see on page 91

2. The construction of HEP may have some geographical constraints to it. For example it relies on the river regime as it needs a reliable supply of water. Geology also plays a factor in creating these schemes. It needs stable and impermeable bedrock to support it's structure.