Your bid/no bid process is a key element to the tender process. You may see an opportunity that you think could be worth pursuing. Before you do start investing time and resources in to it, you need to step back and consider the requirements and implications of going for that bid. Some simple things to consider:
1) Can you deliver to the requirements? (Think about current and future capacity)
2) Do you have experience? (Is the tender relative to your core business or service?)
3) Is it winnable? (Who is your competition?)
4) Is it profitable? (Will you make money or make a loss?)
You may come across an "interesting" opportunity but if you have 4 "Nos" to the above questions, you need to step back and re-think the practicalities.