1.
On the besis of Sources
a. Conventional
दाउरा, गोबर, गुइठा. आदि
b. Non-conventional
कोइला, पेट्रोल, ग्यास, न्युक्लियर पावर
आदि
2.
On the basis of nature
a. Biotic
b. Aboitic
3.
On the basis of Commercial use
a. Commercial
b.
Non-commercial
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