Cleaner non-combustive operation, either fueled directly with hydrogen or by another fuel converted to hydrogen by an onboard reformer.  
Since their use in the 1960’s space programs, fuel cells have been improved and are becoming commercially available in products such as cars, computers, cell phones, residential and small business power generators, and large scale stationary power generators. Fuel cells are also potential power providers for computers, credit card processing centers, jails, cellular towers, mining equipment, entertainment complexes, communication centers, navigation equipment, airports, road signs, defense installations, urban transit buses, and even vacuums.
Fuel cells rely on a fairly simple chemical reaction to generate energy. While there are different kinds of fuel cells, all with their own unique characteristics, the general principle is the same across the board. A fuel cell is composed of an electrolyte sandwiched in between two electrodes. Electrodes are charged, usually metal, plates. The electrolyte is the substance that hydrogen protons freely pass through as they move between electrodes. Electrolytes are made of different substances and these different substances usually are what usually give different types of fuel cells their distinctive names.

The production of energy begins when a stream of hydrogen molecules is forced against the first electrode, called the anode, which is negatively charged. This anode forces the hydrogen molecule to split into protons and electrons. The protons are pulled through the electrolyte directly to the other electrode, called the cathode, which is positively charged. The electrons, having taken a different path around the electrolyte, are captured and used as an electrical current. These electrons then rejoin the protons in the cathode where they are both exposed to oxygen. The hydrogen and the oxygen combine to form pure potable water and some heat. [4] Often, through a process known as cogeneration, this waste heat is captured and utilized in the heating and cooling of the facility where the fuel cell is located.

The fuel cell is only one part of a complete standard fuel cell system. There are actually three main parts. These three main parts are the fuel reformer, the fuel cell stack, and the power conditioner

The fuel reformer , usually through a process called steam reformation process that creates carbon emissions -- isolates the pure hydrogen from a hydrocarbon fuel (methane, ethanol, propane, natural gas, etc.). This hydrogen, although pure, is sometimes referred to as “dirty hydrogen” due to the way it is created. This hydrogen is then put into the fuel cell stack.

The fuel cell stack is any number of fuel cells stacked together to increase the produced energy output. The energy created by the fuel cell stack is in the form of direct current.

The power conditioner , or the inverter, is the mechanism that inverts the direct current produced by the fuel cell into alternating current. The inverting of direct current into alternating current is required for most power applications to work.

Power obtained from the natural water movement of masses of water.  Hydroelectric power plants convert the energy contained in flowing water, like rivers and streams, into electricity. Low impact hydro plants producing less than 30 Megawatts are often considered renewable sources of electricity.
Larger hydro projects, known as high impact, cause concern because dams can change natural river flows, degrade water quality and block fish migration.

Hydropower currently provides about 10 percent of the electricity generated in the United States - a percentage unlikely to increase dramatically, both because few new sites remain for the construction of large dams and because of general opposition to building large new facilities on environmental grounds.
Over 100,000 families in Vietnam use small water turbines to generate electricity.
Overe 45,000 small scale hydro schemes are being used in China, providing power to over 50 million people.

Solar power is responsible for wind power. Winds are created when various layers of the atmosphere absorb different amounts of heat and therefore expand differently. Solar power is also responsible for fossil fuels such as petroleum and coal.   These substances are the result of large masses of decaying plant and animal matter, which during their lifetime, absorbed solar energy.  Fossil fuels are merely concentrated stores of solar energy that these plants had while alive.

Solar power is renewable as long as the sun continues to shine.  Estimated to be another 4.5 billion years.   Simple, dependable and safe, requiring no moving parts or fuel.  Silent in operation, it generates pollution-free electricity. Developing countries have installed over 1 million solar home systems.

India has 300,000 solar lantern in use.
There are around 150,000 solar home power systems in Kenya, more than 100,000 in China and 60,000 in Indonesia.

There are several ways to harness this energy: Solar thermal collectors which can produce hot water and warm air for homes and industrial application. Solar photovoltaic (PV) power, generates electricity directly from sunlight.

A clean and renewable source of electric power; world's fastest growing energy source.
There is enough wind resource spread across the six continents to meet the entire energy consumption of the world roughly four times over.
Wind power is already a success story supplying electricity to millions of people, employing tens of thousands of people and generating billions of dollars in revenue.  Generating electricity from the wind cause none of the problems of conventional fossil fuels.

In China, a country heavily dependent on dirty coal energy, wind capacity is expected to double this year to almost 300 megawatts.

Since the early 1970s, the Danish government has encouraged the development and implementation of a strong wind power industry, particularly through use of tax credits and public investment.  More people are employed in the Danish wind industry than in fisheries.

In Mongolia, portable wind generators are already widely used by nomadic herds-people to run lights, radios and other appliances.

Over 50,000 small wind turbines provide electricity in remote rural areas around the world.

American Wind Energy Association