How does Hextech Anomaly work, specifically how to use it to convert power into energy?

Ruling: Hextech Anomaly allows you to convert power into energy at a 1:1 ratio. Power and energy are distinct resources that go into a common pool and can be spent later in the turn.

Sequence:

• Exhaust runes to float the energy
• Recycle the runes to gain power (which goes into your resource pool)
• Exhaust Hextech Anomaly and pay the power to gain energy
• You now have double the energy available to spend

Nuances:

• Resources stay in your pool until end of turn and can be spent on any cards, not just the next one
• Hextech Anomaly can be used as a reaction while paying for another card, not just floated for later
• Multiple Hextech Anomalies don't stack - each creates its own chain and converts power to energy at 1:1 ratio
• When the ability resolves, you pay the power (it goes away) and gain energy equal to the power paid