refac: only use power sector emissions for B2 and B4 indicators in CBA (#709)

* refac: use power emissions only in B2 and B4 indicators

* feat: change sign of `B2a_co2_variation` to negative

* feat: flip sign of b4 indicators

* docs: add #709 to doc/release_notes

* docs: add #709 to doc/index

* refac: remove functions

* refac: move `factors_by_fuel` outside of loops

* refac: calculate electricity producing assets once inside of main instead of once per indicator

* docs: update docstrings for functions

* refac: condense calculate_power_sector_co2_emissions; update mocksnakemake for debugging

* refac: create generalized function to calculate ac energy balance

* refac: change b4 indicator calculation to use `get_ac_energy_balance()`

* chore: update comments

* refac: remove `groupby_time="sum"`

Co-authored-by: lisazeyen <35347358+lisazeyen@users.noreply.github.com>

---------

Co-authored-by: lisazeyen <35347358+lisazeyen@users.noreply.github.com>

Author: measrainsey

doc/index.rst

@@ -310,15 +310,15 @@ While multiple TYNDP features are already introduced to the Open-TYNDP model, th
      - ✅
    * -
      - B2: CO₂ Variation with societal costs
-     - `#348 <https://github.com/open-energy-transition/open-tyndp/pull/348>`__
+     - `#348 <https://github.com/open-energy-transition/open-tyndp/pull/348>`__, `#709 <https://github.com/open-energy-transition/open-tyndp/pull/709>`__
      - ✅
    * -
      - B3: DRES Integration (curtailment reduction)
      - `#350 <https://github.com/open-energy-transition/open-tyndp/pull/350>`__
      - ✅
    * -
      - B4: Non-CO₂ Emissions (NOx, SOx, PM2.5/10, NMVOC, NH₃)
-     - `#398 <https://github.com/open-energy-transition/open-tyndp/pull/398>`__
+     - `#398 <https://github.com/open-energy-transition/open-tyndp/pull/398>`__, `#709 <https://github.com/open-energy-transition/open-tyndp/pull/709>`__
      - ✅
    * -
      - B5: Grid Losses, B6: Adequacy, B7: Flexibility, B8: Stability, B9: Reserves reduction

doc/release_notes.rst

@@ -25,6 +25,8 @@ Upcoming Open-TYNDP Release
 
 * Update pixi task names and definitions to align between SB and CBA workflows (https://github.com/open-energy-transition/open-tyndp/pull/735).
 
+* Use only electricity-sourced emissions for and and change signs of B2 and B4 indicators (https://github.com/open-energy-transition/open-tyndp/pull/709).
+
 **Bugfixes and Compatibility**
 
 **Documentation**