1. Broken below weekly swing point low and uptrend line - major...

1. Broken below weekly swing point low and uptrend line - major correction started
2. Daily MACD has crossed below zero
3. Broken below bottom Bollinger Band on daily time frame
4. New 40 day low

Where will it correct to?
1. Previous major correction dropped price approx $4.50 from high to low. If it drops a similar amount that would take price down to approx $24.
2. Estimated support zone between 23.50 & 24.94 - swing point low & swing point high of last retracement.
3. A shallow correction of 38.2% of range of entire uptrend would bring price down to $23.91.
4. Bottom of high volume gap of 23/02/2017 is also $23.91.

I believe an analyst has cut AGL's 12 month price target 2.8% to A$24.30/share & downgraded it to Underperform from Neutral.
Also refer:
https://markets.ft.com/data/equities/tearsheet/forecasts?s=AGL:ASX

Daily Bar Chart