Solar Energy has been the power supply of choice for Industrial applications, where power is required at remote locations. This means in these applications that solar power is economic, without subsidy. Most systems in individual uses require a few kilowatts of power.The examples are powering repeater stations for microwave, TV and radio, telemetry and radio telephones. Solar energy is also frequently used on transportation signaling, lighthouses, aircraft warning lights on pylons or structures, and increasingly in road traffic warning signals.Solar's great benefits are highly reliable and requires little maintenance so it's ideal in places that are hard to get to.