The return to investment in terms of growth over a longer period is more informative.

从长期增长的角度来看资本回报率更有意义。

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What angel investors look for is a great team with a good market that could potentially return 10 times their initial investment in a period of 5 years.

FORBES: Angel Investors: How The Rich Invest

The website lists rebates and other subsidies that help to defray installation costs and provides a calculator for figuring out the cost of electricity, the payback period and the return on the investment from installing small wind turbines, which refer to those that are under 100-kilowatt in size and engineered for residential and business properties, including farms and government agencies.

FORBES: A Web Tool For All You Need To Know About Small Wind Energy