Texas businesses still have a good opportunity to lock-in a cheap electric rate thanks to falling natural gas and oil prices, but businesses should not wait too long because OPEC is accelerating the date for an emergency meeting where the cartel is expected to cut production in hopes of raising prices, while gas producers are announcing plans to scale back drilling due to lower natural gas prices.   That means the window on lower energy prices may be closing, and Texas businesses should shop around for a cheap fixed electric rate now, before rates start rising again.   Natural gas, the driver of Texas electric rates , has fallen about 50% since summer spikes saw $13/MMBtu, and trading last week saw prices hit the $6.40 mark.   However, lower prices mean producers are starting to shut-in production wells because the price cannot cover extraction.   The Federal Energy Regulatory Commission