diff --git a/src/app/components/Defence.jsx b/src/app/components/Defence.jsx
index 35fea165..576b65f6 100644
--- a/src/app/components/Defence.jsx
+++ b/src/app/components/Defence.jsx
@@ -76,6 +76,7 @@ export default class Defence extends TranslatedComponent {
       shieldSourcesData.push({ value: Math.round(shield.generator), label: translate('generator') });
       shieldSourcesData.push({ value: Math.round(shield.boosters), label: translate('boosters') });
       shieldSourcesData.push({ value: Math.round(shield.cells), label: translate('cells') });
+      shieldSourcesData.push({ value: Math.round(shield.addition), label: translate('shield addition') });
 
       if (shield.generator > 0) {
         shieldSourcesTt.push(<div key='generator'>{translate('generator') + ' ' + formats.int(shield.generator)}{units.MJ}</div>);
diff --git a/src/app/components/InternalSlot.jsx b/src/app/components/InternalSlot.jsx
index 2bf0feb8..db3d9c81 100644
--- a/src/app/components/InternalSlot.jsx
+++ b/src/app/components/InternalSlot.jsx
@@ -63,6 +63,7 @@ export default class InternalSlot extends Slot {
           { m.getSpinup() ? <div className={'l'}>{translate('spinup')}: {formats.f1(m.getSpinup())}{u.s}</div> : null }
           { m.getDuration() ? <div className={'l'}>{translate('duration')}: {formats.f1(m.getDuration())}{u.s}</div> : null }
           { m.grp === 'scb' ? <div className={'l'}>{translate('cells')}: {formats.int(m.getAmmo() + 1)}</div> : null }
+          { m.grp === 'gsrp' ? <div className={'l'}>{translate('shield addition')}: {formats.int(m.getShieldAddition())}{u.MJ}</div> : null }
           { m.getShieldReinforcement() ? <div className={'l'}>{translate('shieldreinforcement')}: {formats.f1(m.getDuration() * m.getShieldReinforcement())}{u.MJ}</div> : null }
           { m.getShieldReinforcement() ? <div className={'l'}>{translate('total')}: {formats.int((m.getAmmo() + 1) * (m.getDuration() * m.getShieldReinforcement()))}{u.MJ}</div> : null }
           { m.repair ? <div className={'l'}>{translate('repair')}: {m.repair}</div> : null }
diff --git a/src/app/i18n/en.json b/src/app/i18n/en.json
index d028c2a5..2bc67723 100644
--- a/src/app/i18n/en.json
+++ b/src/app/i18n/en.json
@@ -258,6 +258,7 @@
     "generator": "Generator",
     "boosters": "Boosters",
     "cells": "Cells",
+    "shield addition": "Shield Addition",
     "bulkheads": "Bulkheads",
     "reinforcement": "Reinforcement",
     "power and costs": "power and costs",
diff --git a/src/app/shipyard/Calculations.js b/src/app/shipyard/Calculations.js
index c1990b10..e7e85f98 100644
--- a/src/app/shipyard/Calculations.js
+++ b/src/app/shipyard/Calculations.js
@@ -60,7 +60,7 @@ export function shieldStrength(mass, baseShield, sg, multiplier) {
   let ynorm = Math.pow(xnorm, exponent);
   let mul = minMul + ynorm * (maxMul - minMul);
 
-  return baseShield * mul * multiplier;
+  return (baseShield * mul * multiplier);
 }
 
 /**
@@ -358,6 +358,9 @@ export function shieldMetrics(ship, sys) {
         boosterKinDmg = boosterKinDmg * (1 - slot.m.getKineticResistance());
         boosterThermDmg = boosterThermDmg * (1 - slot.m.getThermalResistance());
       }
+      if (slot.m && slot.m.grp == 'gsrp') {
+
+      }
     }
     // Calculate diminishing returns for boosters
     // Diminishing returns not currently in-game
@@ -389,12 +392,19 @@ export function shieldMetrics(ship, sys) {
     // boosterKinDmg = boosterKinDmg > 0.7 ? boosterKinDmg : 0.7 - (0.7 - boosterKinDmg) / 2;
     // boosterThermDmg = boosterThermDmg > 0.7 ? boosterThermDmg : 0.7 - (0.7 - boosterThermDmg) / 2;
     // res.therm = res.therm > 0.7 ? res.therm : 0.7 - (0.7 - res.therm) / 2;
-
-    const generatorStrength = this.shieldStrength(ship.hullMass, ship.baseShieldStrength, shieldGenerator, 1);
+    let shieldAddition = 0;
+    if (ship) {
+      for (const module of ship.internal) {
+        if (module && module.m && module.m.grp === 'gsrp') {
+          shieldAddition += module.m.getShieldAddition();
+        }
+      }
+    }
+    let generatorStrength = this.shieldStrength(ship.hullMass, ship.baseShieldStrength, shieldGenerator, 1);
     const boostersStrength = generatorStrength * boost;
 
     // Recover time is the time taken to go from 0 to 50%.  It includes a 16-second wait before shields start to recover
-    const shieldToRecover = (generatorStrength + boostersStrength) / 2;
+    const shieldToRecover = (generatorStrength + boostersStrength + shieldAddition) / 2;
     const powerDistributor = ship.standard[4].m;
     const sysRechargeRate = this.sysRechargeRate(powerDistributor, sys);
 
@@ -421,7 +431,7 @@ export function shieldMetrics(ship, sys) {
     }
 
     // Recharge time is the time taken to go from 50% to 100%
-    const shieldToRecharge = (generatorStrength + boostersStrength) / 2;
+    const shieldToRecharge = (generatorStrength + boostersStrength + shieldAddition) / 2;
 
     // Our initial regeneration comes from the SYS capacitor store, which is replenished as it goes
     // 0.6 is a magic number from FD: each 0.6 MW of energy from the power distributor recharges 1 MJ/s of regeneration
@@ -448,8 +458,9 @@ export function shieldMetrics(ship, sys) {
     shield = {
       generator: generatorStrength,
       boosters: boostersStrength,
+      addition: shieldAddition,
       cells: ship.shieldCells,
-      total: generatorStrength + boostersStrength + ship.shieldCells,
+      total: generatorStrength + boostersStrength + ship.shieldCells + shieldAddition,
       recover,
       recharge,
     };
diff --git a/src/app/shipyard/Module.js b/src/app/shipyard/Module.js
index 193f37d2..285a9ef4 100755
--- a/src/app/shipyard/Module.js
+++ b/src/app/shipyard/Module.js
@@ -649,6 +649,14 @@ export default class Module {
     return this._getModifiedValue('shieldreinforcement');
   }
 
+  /**
+   * Get the shield addition for this module, taking in to account modifications
+   * @return {Number} the shield addition for this module
+   */
+  getShieldAddition() {
+    return this._getModifiedValue('shieldaddition');
+  }
+
   /**
    * Get the piercing for this module, taking in to account modifications
    * @return {Number} the piercing for this module
diff --git a/src/app/shipyard/Ship.js b/src/app/shipyard/Ship.js
index 3e81877e..400a46d3 100755
--- a/src/app/shipyard/Ship.js
+++ b/src/app/shipyard/Ship.js
@@ -239,7 +239,6 @@ export default class Ship {
       }
       sg = sgSlot.m;
     }
-
     // TODO Not accurate if the ship has modified shield boosters
     return Calc.shieldStrength(this.hullMass, this.baseShieldStrength, sg, 1 + (multiplierDelta || 0));
   }
@@ -943,7 +942,7 @@ export default class Ship {
 
     let armourChange = (slot === this.bulkheads) || (n && n.grp === 'hr') || (old && old.grp === 'hr') || (n && n.grp === 'mrp') || (old && old.grp === 'mrp');
 
-    let shieldChange = (n && n.grp === 'bsg') || (old && old.grp === 'bsg') || (n && n.grp === 'psg') || (old && old.grp === 'psg') || (n && n.grp === 'sg') || (old && old.grp === 'sg') || (n && n.grp === 'sb') || (old && old.grp === 'sb');
+    let shieldChange = (n && n.grp === 'bsg') || (old && old.grp === 'bsg') || (n && n.grp === 'psg') || (old && old.grp === 'psg') || (n && n.grp === 'sg') || (old && old.grp === 'sg') || (n && n.grp === 'sb') || (old && old.grp === 'sb') || (old && old.grp === 'gsrp');
 
     let shieldCellsChange = (n && n.grp === 'scb') || (old && old.grp === 'scb');
 
@@ -1277,7 +1276,7 @@ export default class Ship {
     // Obtain shield metrics with 0 pips to sys (parts affected by SYS aren't used here)
     const metrics = Calc.shieldMetrics(this, 0);
 
-    this.shield = metrics.generator ? metrics.generator + metrics.boosters : 0;
+    this.shield = metrics.generator ? metrics.generator + metrics.boosters + metrics.addition : 0;
     this.shieldExplRes = this.shield > 0 ? 1 - metrics.explosive.total : null;
     this.shieldKinRes = this.shield > 0 ?  1 - metrics.kinetic.total : null;
     this.shieldThermRes = this.shield > 0 ?  1 - metrics.thermal.total : null;