The expected costs of one typical Energy from Space system are $20 billion, split approximately evenly between hardware and deployment (i.e. launches). With each system producing 1 GW and having a lifetime of more than 30 years, the electricity costs are expected to be between $0.10 and $0.50 per kWh. For comparison, average electricity generation costs are $0.10/kWh in the United States and more than $0.50/kWh on remote islands in Indonesia. The investment costs are high relative to existing power plants like coal, gas, and nuclear plants. However, Energy from Space is independent from fuel prices and supply, and consequently have relative low operational costs.
The most important aspect in order to make Energy from Space viable is a significant decrease in launch costs. Currently, it roughly costs $20,000 to bring one kg payload in geostationary orbit. This has to go down to less than $1,000. There are already promising developments in this fields, like the successful flight to the International Space Station of the reusable Dragon module by SpaceX, an American private space transportation company. Also initiatives like Virgin Galaxy and Space Expedition Curacao will make the difference.
The most likely first customers of large-scale Energy from Space systems are countries desiring more energy independence and defense agencies to power remote places. Through international collaboration between space agencies, private sectors, universities and governments, the first systems will be realized.