Well, in this type of questions you can start by a definition. What is your definition of consciousness in this article? Consciousness is a word that is used mainly for the state of being aware of and responsive to one's surroundings, but sometimes also for the abstract notion of global consciousness/ interconnection, or some people equal it with energy.

If you give the first definition, the short answer is that well, many cells in the part of our body that is the brain have learned to work together in a complicated way, as a product of our evolution. "Decoding" consciousness is the effort to find out how exactly these cells cooperate.

If you are referring to consciousness as something that exists separately from the physical body, then as we have no way of proving that, you are only based on your personal feelings and emotions to support that belief.
Can we really trust our own feelings and emotions? These are created, again, by cells and hormones in our bodies as a product of evolution! Emotions (fear, love, anger/aggressiveness in some cases and empathy/friendliness in others etc) are basically instincts and automated responses that have helped us survive. What gave us the purpose to survive and evolve? Well, some things had it, some didn't. Those who didn't have it....didn't survive. Only those who had it remained, including us humans.

About consciousness equaling energy... Energy is the power derived from the use of physical or chemical resources, to provide light, heat or movement. It's the ability of a system to do any type of "work". Our brain needs energy to function. We get our energy from food. Animals get their energy from plants. Plants get their energy from the sun. Our conscious thoughts are a product of using that energy, which is changing from i.e. chemical to electrical. So in essence, yeah, I guess you can say that consciousness is energy, but then you would have to say that everything else in the world is energy as well. It's just how the world works, by energy changing forms.