There are a number of solids that do not conduct electricity well, however, technically everything can be a conductor. Some solids that don't conduct electricity well include wood, glass, plastic, and rubber. If you're looking for specific solid elements that are non-conductors, they would include carbon, phosphorus, sulfur, and selenium.
Selenium is considered a semi-conductor because it's ability to transfer electricity is based on the amount of light shining on it. However, it does not work for this purpose nearly as well as metals.
An electrical insulator is a material whose internal electric changes do not flow freely; therefore, make it nearly non-viable to conduct an electric current under the influence of an electric field. This contrast with other materials, semiconductors, and conductors, which conduct electrical current more efficiently. Insulators support and separate electrical conductors without allowing current through themselves.
All insulators become conductors at very high temperatures as thermal energy of the electrons is sufficient to put them in the conduction band. A material of such low conductivity stimulates the flow of current through it is negligible. The insulators electrons are tightly bonded because the valence shell is close to full or full.
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