My company has just taken over the North Sentinel Island to setup a Dino attraction, construction phase is in progress and we also managed to convince the local to move and settle somewhere else (by hook and by crook) anyhow I am still looking for a power source to light up my park and obviously nuclear plant is an overkill and I don't have enough freshwater to cool the reactor. This is a multi million dollar contract to power the theme park without environmentalist showing up at my door, any taker? BTW my projected electricity consumption is around 10GWh/yr.
People have been studying how to provide energy to the Andaman islands, not for powering dinosaurs parks, but for powering human activities.
Based on this study, fossil fuels are deemed too expensive, while solar, geothermal and wind power are suitable options.
For geothermal power you would need some prospecting to investigate available hot pockets in the underground. Considering that the Andaman are volcanic islands, it is a concrete option. However, if you have to dig holes here and there it is going to be a tad intrusive on the environment. Moreover, I have no data to back up an answer, so I park this for the scope of this answer.
The cited study has found
The wind power density observed at Andaman group of islands are within the range from 55.30 to 106.60 $W/m^2$. [...] One of the best possible sites for locating wind machines is the top of a smooth, well rounded hill with gentle slope lying on a flat plain. A site located on an island in a lake or a sea is usually an excellent site; open plain, an open shoreline as a mountain gap which produces wind funneling is good.
The study found an area where a 5 MW farm could be built, though not on North Sentinel, for obvious reasons.
Generally the small islands situated at the leeward side of the larger islands which has an elevation greater than 60 m could not be proposed for windmills because of its elevation and canopy effects. Whereas in the case of North Passage Island it is surrounded by islands such as Baratang in East, Middle Andaman in North and Strait in South. Though it is surrounded by largest elevated islands the geographical location is well suited for windmills . Eastern side of the north passage has got a passage, Homfrey's strait. It acts as a funnel for wind flow. The surrounding elevation of this island is less than 60m and it is about 7 km away from the shore of Baratang island. Hence, this island has got an excellent geographical location for utilizing it for windmill erection.
A 1 MW turbine, about 54 meters across, working at nominal power 24/7 could theoretically produce a bit less of what you need.
Building 2 or 3 of the above mentioned turbines should provide you a large enough safety margin. However, I would also consider integrating some building with solar power and also install a fuel powered emergency generator. You don't want to run out of electricity during a typhoon, right?
Ocean Wave Energy
They're not quite commercial yet but your throwing a couple million at a company should speed that process up.
There are several kinds, both onshore and off shore. Some are long and thin in the water, others are like large buoys and some are on the beach. They seem to come in a variety of nifty colors.
(pictures from BOEM)
In 2008, the Agucadoura Wave Farm offshore in Portugal was set up and tested. Depending on the waves at the site, each machine produces 150-750 kW. The company had issues but some investment with a new company would make it feasible, based on what I'm reading. (This was the kind like the left hand picture.)
150 kW as an average output 24/7 for a year would produce 1.3 GWH. With 8 machines, you'd get 10.4 GWH, a bit more than you need.
I'm having trouble finding specs for how many machines will fit into what spaces, let alone costs. But it's promising. If you made a deal with the company to be a test site, with tourism and hosting research teams just for that (and you can provide hotels, tours, and other accommodations), you might be able to strike a pretty sweet deal.
Hydrothermal energy runs of the temperature difference in a body of water. The surface water is warmer than deep water so you use a liquid with a boiling point between the two ranges to run generators.
Everything is under water so generally out of sight so no unsightly solar cells or wind turbines detracting from the animals. It doesn't require masses of construction and should be pretty storm resistant. It's 100% renewable and suitable for baseload energy. Being in a tropical area and deep water nearby, it should be pretty efficient.