Ontario introduced time-of-use (TOU) pricing to reflect the costs of producing electricity at different times of the day. There are three TOU periods: 1  Off-peak, when energy demand is low and less expensive sources of electricity is used. 2  Mid-peak, when the cost of energy and demand are moderate. 3  On-peak, when demand is highest and more expensive forms of electricity production are used.
Sheen Obsidian-this is a family of valued types which consists of sub-types categorized according to the effect or color displayed. Microscopic bubbles and/or crystals of Feldspar or Mica trapped in the Obsidian result in a chatoyant (irridescent) sheen when the stone is viewed from certain angles.heen Obsidian-this is a family of valued types which consists of sub-types categorized according to the effect or color displayed. Microscopic bubbles and/or crystals of Feldspar or Mica trapped in the Obsidian result in a chatoyant (irridescent) sheen when the stone is viewed from certain angles.
Obsidian Gemstone Meanings, Properties & Qualities. Obsidian is a black gemstone with a glassy luster, although there are other types of Obsidian including snowflake obsidian and mahogany obsidian. As a black gemstone, it symbolizes self control and resilience. Obsidian is actually volcanic glass.It has been used since prehistoric times for making tools, masks, weapons, mirrors and jewelry. It is found in Iceland, Italy, Japan, Wyoming, and Hawaii.s a black gemstone, it symbolizes self control and resilience. Obsidian is actually volcanic glass. It has been used since prehistoric times for making tools, masks, weapons, mirrors and jewelry.