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However, high initial investment costs have made the option prohibitive for most.

Solar power is not a new idea in Cambodia. In fact, one company brought solar here more than 10 years ago.

Khmer Solar was the brainchild of Peter Banwell and Ford Thai, who started the business in 1997 with the idealistic view that renewable energy should be an option for Cambodians.

Their client base in the first five years was approximately 80 percent NGOs, with the remainder being private homeowners.

NGOs had the capital to invest in the equipment, and many of their projects were far from functioning power lines. Also, the foreign staff were aware of the benefits of using renewable energy.

Kunthap Hing, an adviser for Khmer Solar, was working with the World Bank in the early 2000s, studying the viability of renewables, energy efficiency and conservation.

"The World Bank was a big supporter of solar and still is," he said. "They helped fund studies showing that, if the initial costs could be brought down, rural Cambodia would benefit from solar power."

Ten years ago, the initial investment cost for solar panels, batteries and a charge converter averaged $10 per kilowatt.

To power a small TV for two to three hours, you would need a 130-watt system.

Therefore, the cost of buying and installing that system would have been $1,300.

For an oil-run generator, the investment cost is 50 cents per kilowatt and would have cost $75 for the same capacity.

However, the prices for solar have dropped considerably in recent years. It now costs $5-$8 per kilowatt, depending on the size and complexity of the system.

The lower costs have brought more interest, and there are now more than a dozen companies selling solar power systems in Cambodia.

European countries have invested heavily in solar, with Germany one of the leaders in the field.

Better technology has led to more efficient power converters and new sealed-gel batteries, which last longer and are easier to handle than the wet-cell batteries found in most cars.

Though wet-cell batteries only last two to three years in Cambodia's heat, Chanrith Khuth of KC Solar stated: "We have a warranty of three years for our gel batteries, but we believe they will last for 10."

These cutting-edge power sources are designed to work in a 30-degree environment, which is important because the system is centred on the battery, which is also the weakest part.

Although the battery will need replacing every so often, the converters and solar panels have warranties anywhere from 25-40 years and a probable lifespan of much longer.

All of these advances, combined with lower front-end costs, have made the systems more competitive with other electrical options.

According to The World Bank Web site: "Electricity tariffs in Cambodia are among the highest in the world.

"The average tariff charged by Electricite du Cambodge is 16 US cents/kWh, ranging from 9 to 23 cents/kWh, with even higher tariffs outside Phnom Penh.

"The tariffs of the Rural Electricity Enterprises (REE) range from 30 to 90 cents/kWh."

KC Solar recently installed a 4,000-kilowatt system in a house in Oudong.

The owner had been paying 50 cents/kWh for electricity, but is now off of the grid.

Battambang has become the area with the most sales of late, because many of the farmers are wealthy but only the city centre has power.

Sales trends have reversed recently, with 80 percent of solar systems being sold to private households and the rest to NGOs and government buildings.

Phnom Penh only accounts for about 2 percent of sales, most of which are solar water heaters.