
That's a significant investment. But simply doling out money is not the answer, so how could a government spur investment in renewable energy ? Consider one option: the Feed in Tariff (FiT). The idea is that those generating electricity from sustainable, renewable sources (like solar, wind or hydro-electric) are able to sell their excess energy back to the grid at a higher rate. As an example, in Ontario, consumers purchase electricity at a rate of $0.42 per kWh. By comparison, energy generated by solar sources (PV cells, etc.) can be sold to the utility company at a rate of $0.80 per kWh.
This gives solar-PV generation an advantage in the energy market. Some would say that it could be an unfair advantage, as other renewable energy schemes (wind, hydro-electric or geothermal) may not receive the same economic advantage. This would form a bias towards photo-voltaic systems. Admittedly this could be the case, and it is up to the Government which mandates this policy to allow for a mix of schemes.
So rather than talk about what governments SHOULD do, lets look at what governments ARE doing.

Source: http://www.albertaacts.ca/node/270
"Ontario introduced a feed-in tariff in 2006, and revised it in 2009,[53] which in a draft proposal increases from 42¢/kWh to 80.2¢/kWh for micro-scale (≤10 kW) grid-tied photovoltaic projects.[54][55] Ontario's FIT program also includes a tariff schedule for larger projects up to and including 10MW solar farms at a reduced rate. As of April 2010, several hundred projects have been approved, including 184 large scale projects, worth $8 billion all together.[56] "
Source: http://en.wikipedia.org/wiki/Feed-in_tariff#Canada
Others, like the United States, implement what are called Net Metering Programs, which simply means that the small power generator receives a credit for a portion of any excesses which flow back into the system. Typically, these are considered more of an accounting process, rather than a policy. It is up to the individual consumer (as opposed to a larger entity) to recover their credits or rebates.
Unfortunately, these same utility companies will differentiate between wholesale power price and retail power price, offering to "buy" the electrical credits at wholesale rates, while charging any deficits at Retail rates, imposing a further disadvantage to the consumer. Further, the transmission companies will often impose strict regulations about how a consumer-generation system can be tied to "their" grid, which can be onerous and often expensive to the consumer, thus negating any economic benefits.

President Obama has been promising to invest heavily into Renewable Energy, and it is a key platform strategy for him. Let's hope he's as good as his word. His leadership will dictate how quickly other countries will develop their strategies for investing in Renewable Energy.
The opinions expressed are purely those of the author. Opinions are like noses - everyone has one, and they are entitled to it !