California is installing about 1,000,000,000 Watts of this type of PV system, called PV Roof Top on TESCO LOTUS type buildings. 

OK how is it financed??State or private?

1,000,000,000 W is not 100 kW. More like 1 Terra Watt...

In 2006 California approved the 'California Solar Initiative', offering a choice of investment subsidies or FIT for small and medium systems and a FIT for large systems. The small-system FIT of $0.39 per kWh (far less than EU countries) expires in just 5 years, and the alternate "EPBB" residential investment incentive is modest, averaging perhaps 20% of cost. All California incentives are scheduled to decrease in the future depending as a function of the amount of PV capacity installed. Plus Federal Tax incentives.

Compared to Gemany

FIT = Feed-in-Tariff

In 2004, the German government introduced the first large-scale feed-in tariff system, under a law known as the 'EEG' (Erneuerbare Energien Gesetz) which resulted in explosive growth of PV installations in Germany. At the outset the FIT was over 3x the retail price or 8x the industrial price. The principle behind the German system is a 20 year flat rate contract. The value of new contracts is programmed to decrease each year, in order to encourage the industry to pass on lower costs to the end users. The programme has been more successful than expected with over 1GW installed in 2006, and political pressure is mounting to decrease the tariff to lessen the future burden on consumers.

I think Germany has 4 Gigawatt of PV solar installed.

At the end of 2006, the Ontario Power Authority (Canada) began its Standard Offer Program, the first in North America for small renewable projects (10MW or less). This guarantees a fixed price of $0.42 CDN per kWh over a period of twenty years. Unlike net metering, all the electricity produced is sold to the OPA at the SOP rate. The generator then purchases any needed electricity at the current prevailing rate (e.g., $0.055 per kWh). The difference should cover all the costs of installation and operation over the life of the contract.

Life-cycle analyses show that the energy intensity of typical solar photovoltaic technologies is rapidly evolving. In 2000 the energy payback time was estimated as 8 to 11 years, but more recent studies suggest that technological progress has reduced this to 1.5 to 3.5 years for crystalline silicon PV systems .

Thailand Power Development Plan 2022

For the overall plan of the energy ministry, the ministry aims to increase electricity generated by renewable energy to 5,608MW in 2022 from the present 1,750MW.

Of the overall 5,608MW, 500 MWwill be produced by solar power, 800MW by wind power, 324MW by hydropower, 3,700MWfrom biomass, 120MW from biogas, 160MW from waste, and 3.5MW from hydrogen.

The World Bank has committed 700 million USD for Thailand's renewable energy and energy efficiency projects.

Thai EGAT FIT is 11 Baht kWh for 10 years and a limit of 15 MW, not very much solar.

More Info:

http://en.wikipedia.org/wiki/Photovoltaics

http://www.palangthai.org/docs/