I will go a bit into my "energy boosting" statement more specifically for you since you may find the latter interesting. It's neither a mainstream or conventionally medical accepted theory, but there is a growing understanding, acceptance, and theory based on the chemistry and electro-magnetic physics of alkaline and acid within the body (which is over simply and essentially the interplay, reaction, and balance of negative and positive charge).
If you are interested, later i can reference an excellent book written on the subject. I've been aware of this theory and testing it for about 12 years now.
Let's put aside calories, vitamins, and minerals (in and of themselves) for a moment and look at the body in a much more fundamental and core way. When you go deeper, more basic, and smaller than cells, etc our bodies are essentially organized, multi layered vibrating electrical patterns of matter. Just like in electricity, there are two main poles positive and negative and those are expressed and experienced in different ways in the body.
To really simplify things, think of water and blood in connection to our body electricity and the nervous system which is it's main relay system. If you took distilled water, run a strong current through same, and washed off all salts etc from your hand and placed it in the water, you would not experience any electrical shock. The electricity doesn't "move" through the water very well thus you are in a sense insulated from the positive force of electricity.
What happens when you add some salts, like sodium? Bam, you'd get shocked because the electricity can then flow very well throughout the water via the negative charge of same.
It's well known that the human body and it's blood, universally, has a very narrow ph range of about 7.4 eg slightly alkaline. The body works very hard to maintain that very narrow range of blood ph. If that ph gets altered even to a small extent, big problems happen. Again, the life, the body electricity that flows throughout the nervous system functions most efficiently and strongly within an environment of a negative charge because it is electricity in what is essentially primarily water.
The body's metabolic processes are innately acid forming in nature. One way the body keeps balance is through breathing--for an example, continuous fast but deep breaths of fresh air while the body is relaxed and not expending energy can create a more alkaline, negative charge in the body. But the other way we really affect that is through our diet and particularly through minerals in same. Many minerals tend to have an innately strong negative or positive charge.
Basic potassium is the most negatively charged mineral. Some other negatively charged ones are sodium, calcium, and magnesium for the more macro minerals. Some positively charged ones are sulfur, phosphorus, and iodine for example.
But it's not just minerals that affect it. Proteins and amount of calories in general also do. Generally speaking, the higher the concentration of proteins, more acid forming a food or drink will tend to be. Generally speaking, the more calorie rich a food, the more acid forming it tends to be. (large amounts of potassium can offset these to varying degrees depending when in the same food).
I'm really simplifying things here for the sake of brevity, but the typical modern American and general Western diets tend to be rather acid forming--especially those meat and bread, and junk food junkie types. This adds strain to the body and body works over time to try to keep that all important balance. One common way for the body to do same, is to leach calcium from the bones to counteract the acid buildup in the tissues, etc, which eventually can slightly affect that all important blood ph range crucial to life.
Coconut water is very highly alkalizing. It is so because the balance of alkaline reacting minerals to acid reacting is so high on the former (especially potassium), because it is low calorie, very easy to digest, and because it is very low protein. All in a natural package that nature created, and the nutrients of same are highly bioavailable. You can throw a bunch of crappy, treated/over processed table salt and potassium chloride into some water, and yes it will become more alkalizing, but these are not particularly bioavailable forms, and what the body doesn't use is a waste product and must be gotten rid of. Too much non bioavailable stuff can eventually put strain on the body, when it's constantly striving to rid itself of waste products. If it doesn't do it efficiently, this gunk tends to build up, worsening and perpetuating the cycle until something changes. This is why the closer to natural and food based the nutrition it is, generally the more helpful, efficient, and truly health promoting it will be. Our bodies have been designed and fitted to eat foods that nature produces, not man distilled, isolated, over processed, and/or synthesized chemicals, "nutrients", etc.
Hence, in a sense, albeit not in a conventional or direct sense, i've noticed that Coconut water is "energy boosting". Anything that so counteracts and balances out that over acid load constantly being put on the body from diet, stress, metabolic processes, etc will help to energize the body by helping out the electro-magnetic flow of the nervous system, nerves, and blood. You're basically strengthening, amplifying, and facilitating balance in the body electricity itself! No, it's not energizing in the same way or manner that calories (or even vitamins) are, but it's (very) important in it's own way.
It should be mentioned that while it's extremely rare, it is possible to over alkalize the body, and actually that can be more quickly deadly to the body than a chronic tendency to a bit over acidity (which is very, very common)..
It's actually very hard to over do the over alkalizing process via just natural means of foods and natural drinks. But an illustration from my personal files might be suggestive. I once did a 7 day fast wherein i "ate" only liquid, easy to digest, very low calorie, and highly alkalizing foods like green drinks, fresh lemon juice and herbal teas in water, etc. By the end of the fast and once i got over the main detox parts, i actually was buzzing with energy. I had a lot more than normal, to the point wherein my need for sleep dramatically reduced. But i felt strongly that i should not go beyond the 7 days of highly alkalizing drinks--it was like it was becoming too much.